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CyberChef is the self-purported 'Cyber Swiss-Army Knife' created by GCHQ. It's a fantastic tool for data transformation, extraction & manipulation in your web-browser.

Full credit to @GCHQ for producing the tool. See: https://gchq.github.io/CyberChef/

General Tips

  • Download CyberChef and run it entirely client-side. It doesn't need an internet connection except for certain operations. That way all your data is safe.
  • Use Chrome. Although that might be painful for some. Chrome allows you to use positive lookbehinds which are not supported in Firefox
  • Don't try and shoe-horn CyberChef into something that it can't do. It can do a lot but it's not a fully fledged programming language!

Useful Regular Expressions

Mastering regular expressions are key to making the most of data manipulation in CyberChef (or any DFIR work). Below are some regexs that I keep coming back to.

Extracting Encoded Data

  • Extract Base64: [a-zA-Z0-9+/=]{30,}

    • Here '30' is an arbitrary number that can be adjusted according to the script.
      base64
  • Extract Hexadecimal: [a-fA-F0-9]{10,}

    • This could also be adjusted to {32} (MD5), {40} (SHA1), {64}, SHA256 to extract various hashes hex
  • Extract Character Codes: [\d]{2,3}(,|’)

    • In this example it would extract character codes in the format ('30, 40, 50, 60') charcode

Lookaheads & Lookbehinds

  • Positive Lookbehind: (?<=foo)(.*)
    • Extract everything after 'foo' without including 'foo'
  • Positive Lookahead: ^.*(?=bar)
    • Extract everything before 'bar' without including 'bar'
  • Lookahead/behind Combo: (?<=')(.*?)(?=')
    • Extract everything between ' and ' combo

Working with APIs and CyberChef

CyberChef provides an operation HTTP Request (see Recipe 22) which allows HTTP requests to external resources. Due to Same Origin Policy (SOP) or lack of Cross-Origin Resource Sharing configuration many do not work. SOP is a security measure in modern browsers which prevents you from reading cross-site responses from servers which don't explicitly allow it via CORS. Check out @GlassSec's talk on CyberChef which includes tips to boot Chrome without web-security to enable HTTP requests to otherwise restricted APIs (like Virus Total)

CyberChef Recipes

Some example CyberChef recipes:

Recipe 1: Extract base64, raw inflate & beautify

Recipe 2: Invoke Obfuscation

Recipe 3: From CharCode

Recipe 4: Group Policy Preference Password Decryption

Recipe 5: Using Loops and Labels

Recipe 6: Google ei Timestamps

Recipe 7: Multi-stage COM scriptlet to x86 assembly

Recipe 8: Extract hexadecimal, convert to hexdump for embedded PE file

Recipe 9: Reverse strings, character substitution, from base64

Recipe 10: Extract object from Squid proxy cache

Recipe 11: Extract GPS Coordinates to Google Maps URLs

Recipe 12: Big Number Processing

Recipe 13: Parsing DNS PTR records with Registers

Recipe 14: Decoding POSHC2 executables

Recipe 15: Parsing $MFT $SI Timestamps

Recipe 16: Decoding PHP gzinflate and base64 webshells

Recipe 17: Extracting shellcode from a Powershell Meterpreter Reverse TCP Script

Recipe 18: Recycle Bin Parser with Subsections and Merges

Recipe 19: Identify Obfuscated Base64 with Regular Expression Highlighting

Recipe 20: Using Yara rules with deobfuscated malicious scripts

Recipe 21: Inline deobfuscation of hex encoded VBE script attached to a malicious LNK file

Recipe 22: JA3 API search with HTTP Request and Registers

Recipe 23: Defeating DOSfuscation embedded in a malicious DOC file with Regular Expression capture groups

Recipe 24: Picking a random letter from a six-byte string

Recipe 25: Creating a Wifi QR code

Recipe 26: Extracting and Decoding a Multistage PHP Webshell

Recipe 27: Decoding an Auto Visitor PHP script

Recipe 28: De-obfuscation of Cobalt Strike Beacon using Conditional Jumps to obtain shellcode

Recipe 29: Log File Timestamp Manipulation with Subsections and Registers

Recipe 30: CharCode obfuscated PowerShell Loader for a Cobalt Strike beacon

Recipe 31: Deobfuscate encoded strings in .NET binary

Recipe 32: Extract malicious Gootkit DLL from obfuscated registry data

Recipe 33: Identify embedded URLs in Emotet PowerShell script

Recipe 34: Analysing OOXML Files for URLs

Recipe 35: Decrypting REvil PowerShell ransomware sample

Recipe 36: Create a CyberChef Password Generator

Recipe 37: From Sandbox zipped email to malicious URL

Recipe 38: Planes, Skulls and Envelopes - Live and Let PowerShell

Recipe 39: Decrypt GoldMax aka Sunshutte encrypted configuration files

Recipe 40: Morse Code Madness

Recipe 41: PHP mixed hexadecimal and octal encoding

Recipe 42: PHP Webshell with layered obfuscation

Recipe 43: Magento skimmer deobfuscation

Recipe 44: Decrypting JobCrypter Ransomware

Recipe 45: Sqiud Proxy Log Timestamp Conversion

Recipe 46: Tailoring your regex for the situation

Recipe 47: Trickbot Visual Basic script

Recipe 48: vjw0rm Emoji Madness

Recipe 49: Disassemble an EICAR test file

Recipe 50: Parse Security Descriptor Definition Language output

Recipe 1 - Extract base64, raw inflate and code beautify

A very common scenario: extract Base64, inflate, beautify the code. You may need to then do further processing or dynamic analysis depending on the next stage.

Filename: ahack.bat

Zipped File: cc9c6c38840af8573b8175f34e5c54078c1f3fb7c686a6dc49264a0812d56b54_183SnuOIVa.bin.gz

Sample: SHA256 cc9c6c38840af8573b8175f34e5c54078c1f3fb7c686a6dc49264a0812d56b54

https://www.hybrid-analysis.com/sample/cc9c6c38840af8573b8175f34e5c54078c1f3fb7c686a6dc49264a0812d56b54?environmentId=120

Recipe Details

[{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]},{"op":"Generic Code Beautify","args":[]}]

Recipe_1

Recipe 2 - Invoke-Obfuscation

CyberChef won't be able to handle all types of Invoke-Obfuscation, but here is one that can be decoded.

Filename: Acknowledgement NUT-95-52619.eml

Zipped File: 1240695523bbfe3ed450b64b80ed018bd890bfa81259118ca2ac534c2895c835.bin.gz

Sample: SHA256 1240695523bbfe3ed450b64b80ed018bd890bfa81259118ca2ac534c2895c835

https://www.hybrid-analysis.com/sample/1240695523bbfe3ed450b64b80ed018bd890bfa81259118ca2ac534c2895c835?environmentId=120

Recipe Details

[{"op":"Find / Replace","args":[{"option":"Regex","string":"\\^|\\\\|-|_|\\/|\\s"},"",true,false,true,false]},{"op":"Reverse","args":["Character"]},{"op":"Generic Code Beautify","args":[]},{"op":"Find / Replace","args":[{"option":"Simple string","string":"http:"},"http://",true,false,true,false]},{"op":"Extract URLs","args":[false]},{"op":"Defang URL","args":[true,true,true,"Valid domains and full URLs"]}]

Recipe_2

Recipe 3 - From CharCode

Malware and scripts often use Charcode to represent characters in order to evade from AV and EDR solutions. CyberChef eats this up.

Filename: 3431818-f71f60d10b1cbe034dc1be242c6efa5b9812f3c6.zip

Source: https://gist.github.com/jonmarkgo/3431818

Recipe Details

[{"op":"Regular expression","args":["User defined","([0-9]{2,3}(,\\s|))+",true,true,false,false,false,false,"List matches"]},{"op":"From Charcode","args":["Comma",10]},{"op":"Regular expression","args":["User defined","([0-9]{2,3}(,\\s|))+",true,true,false,false,false,false,"List matches"]},{"op":"From Charcode","args":["Space",10]}]

Recipe_3

Recipe 4 - Group Policy Preference passwords

When a new GPP is created, there’s an associated XML file created in SYSVOL with the relevant configuration data and if there is a password provided, it is AES-256 bit encrypted. Microsoft published the AES Key, which can be used to decrypt passwords store in: \\SYSVOL<DOMAIN>\Policies\

Credit: @cyb3rops

Source 1: https://twitter.com/cyb3rops/status/1036642978167758848

Source 2: https://adsecurity.org/?p=2288

Recipe Details

[{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"To Hex","args":["None"]},{"op":"AES Decrypt","args":[{"option":"Hex","string":"4e9906e8fcb66cc9faf49310620ffee8f496e806cc057990209b09a433b66c1b"},{"option":"Hex","string":""},"CBC","Hex","Raw",{"option":"Hex","string":""}]},{"op":"Decode text","args":["UTF16LE (1200)"]}]

Recipe_4

Recipe 5 - Using loops & labels

CyberChef can use labels to identify parts of the recipe and then loop back to perform operations multiple times. In this example, there are 29 rounds of Base64 encoding which are extracted and decoded.

Credit: @pmelson

Source File: hmCPDnHs.txt

Source 1: https://pastebin.com/hmCPDnHs

Source 2: https://twitter.com/pmelson/status/1078776229996752896

Also see more example of loops over Base64: https://twitter.com/QW5kcmV3/status/1079095274776289280 (Credit: @QW5kcmV3)

Recipe Details

[{"op":"Label","args":["top"]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]},{"op":"Jump","args":["top",28]},{"op":"Generic Code Beautify","args":[]}]

Recipe_5

Recipe 6 - Google ei timestamp

Google uses its own timestamp, I call ei time, which it embeds in the URL.

Source: https://bitofhex.com/2018/05/29/cyberchef/

Recipe Details

[{"op":"From Base64","args":["A-Za-z0-9-_=",true]},{"op":"To Hex","args":["None"]},{"op":"Take bytes","args":[0,8,false]},{"op":"Swap endianness","args":["Hex",4,true]},{"op":"From Base","args":[16]},{"op":"From UNIX Timestamp","args":["Seconds (s)"]}]

Recipe_6

Recipe 7 - COM scriptlet to disassembled x86 assembly

This is an eleven-stage decoded COM scriptlet that uses Base64, Gunzip, RegEx, and Disassemble x86 instructions.

Credit: @JohnLaTwC

Filename: 41a6e22ec6e60af43269f4eb1eb758c91cf746e0772cecd4a69bb5f6faac3578.txt

Source 1: https://gist.githubusercontent.com/JohnLaTwC/aae3b64006956e8cb7e0127452b5778f/raw/f1b23c84c654b1ea60f0e57a860c74385915c9e2/43cbbbf93121f3644ba26a273ebdb54d8827b25eb9c754d3631be395f06d8cff

Source 2: https://twitter.com/JohnLaTwC/status/1062419803304976385

Recipe Details

[{"op":"Regular expression","args":["","[A-Za-z0-9=/]{40,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Remove null bytes","args":[]},{"op":"Regular expression","args":["User defined","[A-Za-z0-9+/=]{40,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Gunzip","args":[]},{"op":"Regular expression","args":["User defined","[A-Za-z0-9+/=]{40,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"To Hex","args":["Space"]},{"op":"Remove whitespace","args":[true,true,true,true,true,false]},{"op":"Disassemble x86","args":["32","Full x86 architecture",16,0,true,true]}]

Recipe_7

Recipe 8 - Extract hexadecimal, convert to hexdump for embedded PE file

This file has an embedded PE file (SHA 256: 26fac1d4ea12cdceac0d64ab9694d0582104b3c84d7940a4796c1df797d0fdc2, R5Sez8PH.exe, VT: 54/70). Using CyberChef, we can regex hexadecimal and the convert to a more easily viewable hexdump.

Source 1: https://pastebin.com/R5Sez8PH (sorry: no longer available!)

Source 2: https://twitter.com/ScumBots/status/1081949877272276992

Recipe Details

[{"op":"Regular expression","args":["User defined","[a-fA-F0-9]{200,}",true,true,false,false,false,false,"List matches"]},{"op":"From Hex","args":["Auto"]},{"op":"To Hexdump","args":[16,false,false]}]

Recipe_8

Recipe 9 - Reverse strings, character substitution, from base64

A blob of base64 with some minor bytes to be substituted. Original decoding done by @pmelson in Python and converted to CyberChef.

Credit: @pmelson

Source 1: https://pastebin.com/RtjrweYF / RtjrweYF.txt

Source 2: https://twitter.com/pmelson/status/1076893022758100998

Recipe Details

[{"op":"Reverse","args":["Character"]},{"op":"Find / Replace","args":[{"option":"Regex","string":"%"},"A",true,false,true,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"×"},"T",true,false,false,false]},{"op":"Find / Replace","args":[{"option":"Simple string","string":"÷"},"V",true,false,false,false]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"To Hexdump","args":[16,false,false]}]

Recipe_9

Recipe 10 - Extract object from Squid proxy cache

Don't manually carve out your Squid cache objects. Simply upload the file to CyberChef. This recipe will search for the magic bytes 0x0D0A0D0A, extract everything after. It then gzip decompresses the object for download.

Source: 00000915 (output should be TrueCrypt_Setup_7.1a.exe with SHA256 e95eca399dfe95500c4de569efc4cc77b75e2b66a864d467df37733ec06a0ff2)

Recipe Details

[{"op":"To Hex","args":["None"]},{"op":"Regular expression","args":["User defined","(?<=0D0A0D0A).*$",true,false,false,false,false,false,"List matches"]},{"op":"From Hex","args":["Auto"]},{"op":"Gunzip","args":[]}]

Recipe_10

Recipe 11 - Extract GPS Coordinates to Google Maps URLs

If you need to quickly triage where a photo was taken and you're lucky enought to have embedded GPS latitude and longitudes then use this recipe to quickly make a usable Google Maps URL to identify the location.

Recipe Details

[{"op":"Extract EXIF","args":[]},{"op":"Regular expression","args":["User defined","((?<=GPSLatitude:).*$)|((?<=GPSLongitude: ).*$)",true,true,false,false,false,false,"List matches"]},{"op":"Find / Replace","args":[{"option":"Extended (\\n, \\t, \\x...)","string":"\\n"},",",true,false,true,false]},{"op":"Find / Replace","args":[{"option":"Simple string","string":" "},"https://maps.google.com/?q=",true,false,true,false]}]

Recipe_11

Recipe 12 - Big Number Processing

CyberChef can handle massive numbers. Here we can use a simple recipe to change a 38-digit X509SerialNumber to its hexadecimal equivalent X.509 certificate serial number. Then we can regex the hexadecimal and insert a colon to transform it to the correct format.

Credit: @QW5kcmV3

Source: https://twitter.com/QW5kcmV3/status/949437437473968128

Recipe Details

[{"op":"To Base","args":[16]},{"op":"Regular expression","args":["User defined","[a-f0-9]{2,2}",true,true,false,false,false,false,"List matches"]},{"op":"Find / Replace","args":[{"option":"Extended (\\n, \\t, \\x...)","string":"\\n"},":",true,false,true,false]}]

Recipe_12

Recipe 13 - Parsing DNS PTR records with Registers

IP addresses in DNS PTR records are stored as least significant octet first. For example: 167.139.44.10.in-addr.arpa would relate to IP address of 10.44.139.167. Using CyberChef's registers we can allocate each octet to a memory register (or variable if it's easier to think of it that way). These can then be reversed to re-order the IP address. A find/replace tidies up the rest of the record. This could be reversed it you wanted to translate 'regular' IP addresses to search in DNS PTR records.

Recipe_13

Recipe Details

[{"op":"Fork","args":["\\n","\\n",false]},{"op":"Register","args":["(\\d{1,3}).(\\d{1,3}).(\\d{1,3}).(\\d{1,3})",true,false,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"$R0.$R1.$R2.$R3"},"$R3.$R2.$R1.$R0",true,false,true,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":".in-addr.arpa"},"",true,false,true,false]}]

Recipe 14 - Decoding POSHC2 executables

PoshC2 is a proxy aware C2 framework that utilises Powershell to aid penetration testers with red teaming, post-exploitation and lateral movement. The dropper is based on PowerShell and consists of a PowerShell script which is double Base64 encoded and compressed. Extracting the strings can be done with CyberChef as detailed below. Depending on the settings and customisation of the executable you may need to adjust your recipe.

Credit: @a_tweeter_user

Source: https://twitter.com/a_tweeter_user/status/1100751236687642624

Source: posh.zip

Recipe_14

Recipe Details

[{"op":"Strings","args":["All",4,"Alphanumeric + punctuation (A)",false]},{"op":"Remove null bytes","args":[]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+=]{200,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Remove null bytes","args":[]},{"op":"Regular expression","args":["User defined","[a-z0-9/\\\\+=]{100,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]}]

Recipe 15 - Parsing $MFT $SI Timestamps

CyberChef can do just about anything with data. Here are raw hex bytes from a $MFT entry. By selecting certain bytes, and using various functions of CyberChef I can parse any part of the data as needed. This recipe will extract and parse the $SI timestamps. Encase no more!

Recipe 15

Recipe Details

[{"op":"Take bytes","args":[160,64,false]},{"op":"Regular expression","args":["User defined",".{16}",true,true,true,false,false,false,"List matches with capture groups"]},{"op":"Fork","args":["\\n","\\n",false]},{"op":"Swap endianness","args":["Hex",10,true]},{"op":"Remove whitespace","args":[true,true,true,true,true,false]},{"op":"Windows Filetime to UNIX Timestamp","args":["Nanoseconds (ns)","Hex"]},{"op":"From UNIX Timestamp","args":["Nanoseconds (ns)"]},{"op":"Merge","args":[]},{"op":"Register","args":["(.*)\\n(.*)\\n(.*)\\n(.*)",true,false,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"$R0"},"$SI Creation Time: $R0",true,false,true,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"$R1"},"$SI Modified Time: $R1",true,false,true,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"$R2"},"$SI MFT Change Time: $R2",true,false,true,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"$R3"},"$SI Access Time: $R3",false,false,true,false]}]

Recipe 16 - Decoding PHP gzinflate and base64 webshells

Webshells come in all shapes and sizes. For PHP webshells the combination of gzinflate and base64 can be used to obfuscate the eval data. In this example, there are 21 rounds of compression and base64 that we can quickly parse out using labels and loops.

Source: https://github.com/LordWolfer/webshells/blob/b7eefaff64049e3ff61e90c850686135c0ba74c4/from_the_wild1.php

Recipe 16

Recipe Details

[{"op":"Label","args":["start"]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9=/+]{10,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Raw Inflate","args":[0,0,"Block",false,false]},{"op":"Jump","args":["start",21]}]

Recipe 17 - Extracting shellcode from a Powershell Meterpreter Reverse TCP script

Often seen in @pmelson's Pastbin bot @scumbots, this peels away multiple layers of an encoded Powershell script to display the shellcode. From here you could extract PUSH statements to try and identify the IP address & port, but you'll get too many false positives. So you're better off using a tool like scdbg (see: http://sandsprite.com/blogs/index.php?uid=7&pid=152)

Source: https://twitter.com/ScumBots/status/1121854255898472453

Source: https://pastebin.com/9DnD6t6W / 9DnD6t6W.txt

Recipe 17

Recipe Details

[{"op":"Regular expression","args":["User defined","[a-zA-Z0-9=/+]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Remove null bytes","args":[]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9=/+]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Gunzip","args":[]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9=/+]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"To Hex","args":["None"]},{"op":"Disassemble x86","args":["32","Full x86 architecture",16,0,true,true]}]

Recipe 18 - Recycle Bin Parser with Subsections and Merges

Subsections and Merges are powerful tools in CyberChef that allow the application of ingredients to a selection of data rather than the whole input file. This section can then be merged together to continue on the whole input. In an awesome piece of work @GlassSec has created a Windows Recycle Bin parser using CyberChef indicating the possibilities of these functions is endless.

Source: https://gist.github.com/glassdfir/f30957b314ec39a8aa319420a29ffc76

Credit: https://twitter.com/GlassSec

Recipe 18

Recipe Details

[{"op":"Conditional Jump","args":["^(\\x01|\\x02)",true,"Error",10]},{"op":"Find / Replace","args":[{"option":"Regex","string":"^(\\x02.{23})(....)"},"$1",false,false,false,false]},{"op":"Subsection","args":["^.{24}(.*)",true,true,false]},{"op":"Decode text","args":["UTF16LE (1200)"]},{"op":"Find / Replace","args":[{"option":"Regex","string":"^(.*)."},"\\nDeleted File Path: $1",false,false,false,false]},{"op":"Merge","args":[]},{"op":"Subsection","args":["^.{16}(.{8})",false,true,false]},{"op":"Swap endianness","args":["Raw",8,true]},{"op":"To Hex","args":["None"]},{"op":"Windows Filetime to UNIX Timestamp","args":["Seconds (s)","Hex"]},{"op":"From UNIX Timestamp","args":["Seconds (s)"]},{"op":"Find / Replace","args":[{"option":"Regex","string":"^(.* UTC)"},"\\nFile Deletion Time: $1",true,false,true,false]},{"op":"Merge","args":[]},{"op":"Subsection","args":["^.{8}(.{8})",true,true,false]},{"op":"To Hex","args":["None"]},{"op":"Swap endianness","args":["Hex",8,true]},{"op":"From Base","args":[16]},{"op":"Find / Replace","args":[{"option":"Regex","string":"^(.*)"},"\\nDeleted File Size: $1 bytes",true,false,true,true]},{"op":"Merge","args":[]},{"op":"Find / Replace","args":[{"option":"Regex","string":"^.{8}"},"******** WINDOWS RECYCLE BIN METADATA ********",true,false,false,false]},{"op":"Jump","args":["Do Nothing",10]},{"op":"Label","args":["Error"]},{"op":"Find / Replace","args":[{"option":"Regex","string":"^.*$"},"This doesn't look like a Recycle Bin file to me ",true,false,true,false]},{"op":"Label","args":["Do Nothing"]}]

Recipe 19 - Identify Obfuscated Base64 with Regular Expression Highlighting

Less of a recipe and more of a technique. Using the 'highlight' function of the regular expression ingredient can clearly bring out where base64 data has been broken up with non-traditional base64 character set. Here the sequence '@<!' is used to obfuscate and disrupt automated encoding conversion. Looking further down the script, the sequence is substituted with 'A', which can then be inserted with a Find/Replace prior to the extraction. This continues for multiple rounds until a domain of interest is revealed (along with an executable prior).

Source: https://pastebin.com/TmJsB0Nv & https://twitter.com/pmelson/status/1167065236907659264

Recipe 19_1

Recipe 19_2

Recipe 19_final

Recipe Details

[{"op":"Find / Replace","args":[{"option":"Simple string","string":"@<!"},"A",true,false,true,false]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{20,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{50,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Find / Replace","args":[{"option":"Simple string","string":"@<!"},"A",true,false,true,false]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{50,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]}]

Recipe 20 - Using Yara rules with deobfuscated malicious scripts

Although not the most convenient way, CyberChef does provide the ability to run a yara rule over the output of a recipe. You could combine this by using the multiple inputs function to scan a larger number of files.

Source: https://twitter.com/ScumBots/status/1168528510681538560 & https://pastebin.com/r40SXe7V

Recipe 20

Recipe Details

[{"op":"Regular expression","args":["User defined","\\(.*\\);",true,false,false,false,false,false,"List matches"]},{"op":"Find / Replace","args":[{"option":"Regex","string":",|\\(|\\);"}," ",true,false,true,false]},{"op":"From Charcode","args":["Space",10]},{"op":"YARA Rules","args":["rule SuspiciousPowerShell {\n meta:\n description = \"Testing Yara on Cyberchef for Powershell\"\n strings:\n $a1 = \"[System.Reflection.Assembly]\" ascii\n $a2 = \"IEX\" ascii nocase\n $a3 = \"powershell.exe -w hidden -ep bypass -enc\" ascii\n condition:\n 2 of them\n}",true,true,true,true]}]

Recipe 21 - Inline deobfuscation of hex encoded VBE script attached to a malicious LNK file

This recipe extracts a VBE payload from a Microsoft Shortcut File (LNK) and then decodes the hex strings in-line using subsections.

Source: malicious.lnk.bin

Recipe 21

Recipe Details

[{"op":"Microsoft Script Decoder","args":[]},{"op":"Subsection","args":["(?<=\\(\\\")(.*?)(?=\\\"\\))",true,true,false]},{"op":"Fork","args":["\\n","\\n",false]},{"op":"From Hex","args":["Auto"]}]

Recipe 22 - JA3 API search with HTTP Request and Registers

Using the HTTP Request function and Registers we can enrich out data with that from an API or external resource. Here we are searching against three JA3 hashes for any known bad.

Source: Input hashes: 1aa7bf8b97e540ca5edd75f7b8384bfa, 1be3ecebe5aa9d3654e6e703d81f6928, and b386946a5a44d1ddcc843bc75336dfce

Recipe 22

Recipe Details

[{"op":"Comment","args":["https://ja3er.com/search/hash"]},{"op":"Fork","args":["\\n","\\n",false]},{"op":"Register","args":["(.*)",true,false,false]},{"op":"HTTP request","args":["GET","https://ja3er.com/search/$R0","","Cross-Origin Resource Sharing",false]},{"op":"JSON Beautify","args":[" ",false]}]

Recipe 23 - Defeating DOSfuscation embedded in a malicious DOC file with Regular Expression capture groups

This malicious DOC file is downloaded straight from Hybrid-Analysis. We gunzip it out, select the dosfuscation with a regular expression, then select the critical section that is being used with the 'set' function. This section is deobfuscated with a reverse for loop with a step of three. So once selected we reverse the string and use regular expression capture groups to select every third character. This is great work from Hack eXPlorer on YouTube. Go there and watch!

Source: Untitled-11232018-659370.doc.bin.gz

Credit: Adapted from Hack eXPlorer's video Hiding Malicious code using windows CMD - Dosfuscation

Recipe 23

Recipe Details

[{"op":"Gunzip","args":[]},{"op":"Regular expression","args":["User defined","c:\\\\.*\"",true,true,false,false,false,false,"List matches"]},{"op":"Find / Replace","args":[{"option":"Simple string","string":"^"},"",true,false,true,false]},{"op":"Regular expression","args":["User defined","(?<=9ojB\\=)(.*?)(?=\\) )",true,true,false,false,false,false,"List matches"]},{"op":"Reverse","args":["Character"]},{"op":"Regular expression","args":["User defined","(.)..",true,true,false,false,false,false,"List capture groups"]},{"op":"Find / Replace","args":[{"option":"Regex","string":"\\n"},"",true,false,true,false]},{"op":"Extract URLs","args":[false]},{"op":"Extract domains","args":[true]}]

Recipe 24 - Picking a random letter from a six-byte string

A request for assistance led to this recipe which uses Registers, HTTP request and some Regex to select a random character from a six-byte string.

Credit: Adapted from Steve Thompson

Recipe 24

Recipe Details

[{"op":"Register","args":["(.*)",true,false,false]},{"op":"HTTP request","args":["GET","https://www.random.org/integers/?num=1&min=1&max=6&col=1&base=10&format=plain&rnd=new","","Cross-Origin Resource Sharing",false]},{"op":"Register","args":["(.)",true,false,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"(.)"},"$R0",true,false,true,false]},{"op":"Regular expression","args":["User defined","(.){$R1}",true,true,false,false,false,false,"List capture groups"]},{"op":"Head","args":["Line feed",1]}]

Recipe 25 - Creating a WiFi QR code

Either for ease of letting your mates access your guest wifi, or for any Red Team that needs to add tempting convenience to a rogue access point! Using the create QR Code function to allow Android or iOS devices to logon to your Wifi.

Credit: https://twitter.com/mattnotmax/status/1242031548884369408
Background: https://github.com/zxing/zxing/wiki/Barcode-Contents#wi-fi-network-config-android-ios-11

Recipe Details

Generate_QR_Code('PNG',5,2,'Medium')

Recipe 25

Recipe 26 - Extracting and Decoding a Multistage PHP Webshell

Decoding a Webshell documented by SANS entirely within Cyberchef using regex, ROT13, HTTP Request, Registers and more!

Credit: https://twitter.com/thebluetoob

Recipe Details

[{"op":"Regular expression","args":["User defined","(?<=')(.*?)(?=')",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"ROT13","args":[true,true,13]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]},{"op":"ROT13","args":[true,true,13]},{"op":"Extract URLs","args":[false]},{"op":"Register","args":["(.*)",true,false,false]},{"op":"HTTP request","args":["GET","$R0","","Cross-Origin Resource Sharing",false]},{"op":"Strings","args":["Single byte",4,"Alphanumeric + punctuation (A)",false]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+=/]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Regular expression","args":["User defined","(?<=')(.*?)(?=')",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]},{"op":"ROT13","args":[true,true,13]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+=/]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]}]

Recipe 26

Recipe 27 - Decoding an Auto Visitor PHP script

Decoding an auto visitor script written in PHP within Cyberchef using regex, ROT13, multiple decompression algorithms, and subsections! The key point to consider is there are two variables using different rounds of obfuscation. You have a couple of options: work in multiple CyberChef windows to get the end result, or, as below, use subsections and greg for each variable to manipulate each independently and get both deobfuscated outputs in the one script. You can shorten the recipe further by using loops to jump the multiple rounds of Raw Inflate.

Credit: Original script provided by @NtSetDefault, original Cyberchef recipe(s) created by @thebluetoob, and refined by @mattnotmax in to one recipe.

Recipe Details

[{"op":"Regular expression","args":["User defined","(?<=')(.*?)(?=')",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"ROT13","args":[true,true,13]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]},{"op":"ROT13","args":[true,true,13]},{"op":"Subsection","args":["(?<=\\$Fadly.*?\")(.*?)(?=\\\")",true,true,false]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"URL Decode","args":[]},{"op":"From HTML Entity","args":[]},{"op":"Merge","args":[]},{"op":"Subsection","args":["(?<=\\$Gans.*?\")(.*?)(?=\\\")",true,true,false]},{"op":"Reverse","args":["Character"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Label","args":["jump"]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]},{"op":"Jump","args":["jump",2]},{"op":"Zlib Inflate","args":[0,0,"Adaptive",false,false]},{"op":"Zlib Inflate","args":[0,0,"Adaptive",false,false]}]

Recipe 27

Recipe 28 - De-obfuscation of Cobalt Strike Beacon using Conditional Jumps to obtain shellcode

Choose your poison with this ingenious script from @0xtornado which determines which type of obfuscation your beacon script has via CyberChef conditional jumps to parse out the shellcode. First the code looks for a simple regex 'bxor' to then jump to the appropriate section of the recipe. Else it parses out the second type. Using CyberChef 'tabs' you can load up two different scripts and get out your data. Impress your colleagues and friendly red team or local APT crew!

Credit: https://twitter.com/0xtornado/status/1255866333545316352

Recipe Details

[{"op":"Conditional Jump","args":["bxor",false,"Decode_Shellcode",10]},{"op":"Label","args":["Decode_beacon"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Decode text","args":["UTF-16LE (1200)"]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Gunzip","args":[]},{"op":"Label","args":["Decode_Shellcode"]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"XOR","args":[{"option":"Decimal","string":"35"},"Standard",false]}]

Recipe 28_1

Recipe 28_1

Recipe 29 - Log File Timestamp Manipulation with Subsections and Registers

Not everyone thinks of CyberChef as a tool for log file analysis. But its handy if you have to transpose, reformat or maniulate a log file to suit your purpose. Here, we have an Apache log file with a timestamp that doesn't lead to useful temporal analysis with other log files: the date format is not sortable, its enclosed in square brackets and it's in UTC +1 not a standard UTC. Using Subsections, Registers and Transpose Date and Time we can change the formatting of the timestamp and move the column around to be able to combine it with other data. Awesome!

Credit: @gazambelli and @mattnotmax

Recipe Details

[{"op":"Fork","args":["\\n","\\n",false]},{"op":"Subsection","args":["\\[.*\\+0100\\]",true,true,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"\\[|\\]"},"",true,false,true,false]},{"op":"Translate DateTime Format","args":["Standard date and time","DD/MMM/YYYY:HH:mm:ss ZZ","Etc/GMT-1","YYYY-MM-DDTHH:mm:ss ZZ","UTC"]},{"op":"Merge","args":[]},{"op":"Fork","args":["\\n","\\n",false]},{"op":"Register","args":["(.*)(\\d{4}-.*\\+0000)(.*)",true,false,false]},{"op":"Find / Replace","args":[{"option":"Simple string","string":"$R0$R1$R2"},"$R1 $R0 $R2",true,false,true,false]}]

Recipe 29

Recipe 30 - CharCode obfuscated PowerShell loader for a Cobalt Strike beacon

A variant on the standard PowerShell loader for Cobalt Strike. Here the first layer of obfuscation is a GZipped blob split into two CharCode arrays. The end result is up to you: disassembly, strings, extract IP, or parse UserAgent. Choose your own adventure.

Source: @scumbots & https://pastebin.com/raw/mUFM4fcQ

Recipe Details

[{"op":"Regular expression","args":["User defined","\\d{1,3}",true,true,false,false,false,false,"List matches"]},{"op":"From Charcode","args":["Line feed",10]},{"op":"Gunzip","args":[]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"XOR","args":[{"option":"Decimal","string":"35"},"Standard",false]},{"op":"Strings","args":["Single byte",5,"All printable chars (A)",false]}]

Recipe 30

Recipe 31 - Deobfuscate encoded strings in .NET binary

The SolarWinds malicious .dll contained obfuscated strings using compression and base64. Rather than lose the context in your analysis, we can do a quick de-obfuscation in-line by selecting the strings with a Subsection and then converting. The result is a function that becomes readable with context and avoids a potentially error-prone cut and paste.

Credit: @cybercdh & @Shadow0pz
Source: https://twitter.com/cybercdh/status/1338885244246765569 & https://twitter.com/Shadow0pz/status/1338911469480661000

Recipe Details

[{"op":"Subsection","args":["(?<=\\(\\\")(.*)(?=\\\"\\))",true,true,false]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]}]

Recipe 31

Recipe 32 - Extract malicious Gootkit DLL from obfuscated registry data

Gootkit stores a DLL inside the registry as encoded PowerShell. CyberChef makes mince meat of this so-called 'fileless' malware. A handy recipe provided by @StefanKelm puts the 'file' back in 'fileless' (yes, I thought of that one myself, we are up to recipe 32 my friends...).

Source: https://github.com/StefanKelm/cyberchef-recipes

Recipe Details

[{"op":"Decode text","args":["UTF-16LE (1200)"]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Decode text","args":["UTF-16LE (1200)"]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]}]

Recipe 32

Recipe 33 - Identify embedded URLs in Emotet PowerShell script

Using the powerful operation of Registers, a handy recipe from @Cryptolaemus1 extracts obfuscated URLs from the PowerShell from an Emotet malicious document. Here capture groups are used to grab the find/replace string which de-obfuscates the URLs. Awesome stuff.

Credit: @Cryptolaemus and @NtRaiseException()
Source: https://twitter.com/Cryptolaemus1/status/1319357369902649344

Recipe Details

[{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Decode text","args":["UTF-16LE (1200)"]},{"op":"Find / Replace","args":[{"option":"Regex","string":"'\\)?\\+\\(?'"},"",true,false,true,false]},{"op":"Register","args":["\\(+'(=[\\w\\d]*)'\\)+,'/'\\)",true,false,false]},{"op":"Find / Replace","args":[{"option":"Simple string","string":"$R0"},"/",true,false,true,false]},{"op":"Register","args":["\\/(.)http",true,false,false]},{"op":"Find / Replace","args":[{"option":"Simple string","string":"$R1"},"\\n",true,false,true,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"'"},"\\n",true,false,true,false]},{"op":"Extract URLs","args":[false]}]

Recipe 33

Recipe 34 - Analysing OOXML Files for URLs

Didier Stevens demonstrates the amazing simplicity and usefulness of CyberChef by extracting URLs from OOXML documents (e.g. .docx files). By unzipping the file and filtering out the 'known good' the remaining URLs can be inspected. Don't forget to defang to avoid any unnecessary clicks or operational security mistakes. Combine with CyberChef 'tabs' functionality and you could analyse a batch of files.

Credit: @DidierStevens
Source: https://isc.sans.edu/diary/27020

Recipe Details

[{"op":"Unzip","args":["",false]},{"op":"Extract URLs","args":[false]},{"op":"Filter","args":["Line feed","http://schemas\\.openxmlformats\\.org/",true]},{"op":"Filter","args":["Line feed","http://schemas\\.microsoft\\.com/",true]},{"op":"Filter","args":["Line feed","http://purl\\.org/",true]},{"op":"Filter","args":["Line feed","http://www\\.w3\\.org/",true]},{"op":"Defang URL","args":[true,true,true,"Valid domains and full URLs"]}]

Recipe 34

Recipe 35 - Decrypting REvil PowerShell ransomware sample

An AES encrypted PowerShell ransomware script is no match for CyberChef. Here were can convert the Base64 to hex, extract the IV and Key into registers and use them to decrypt the blob. Once decrypted we can examine the data and identify a PE file 1925 bytes into the decrypted blob. Extracting this we can then use other tools to identify its behaviour including detonation or static analysis.

Source: @mattnotmax
Further Info: Powershell Dropping a REvil Ransomware

Recipe Details

[{"op":"Subsection","args":["(?<=\\\")([a-zA-Z0-9+/=]{20,})(?=\\\")",true,true,false]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"To Hex","args":["None",0]},{"op":"Merge","args":[]},{"op":"Register","args":["(?<=\\\")([a-fA-F0-9]{32})(?=\\\")",true,false,false]},{"op":"Register","args":["(?<=\\\")([a-fA-F0-9]{64})(?=\\\")",true,false,false]},{"op":"Regular expression","args":["User defined","[a-f0-9]{100,}",true,true,false,false,false,false,"List matches"]},{"op":"AES Decrypt","args":[{"option":"Hex","string":"$R1"},{"option":"Hex","string":"$R0"},"CBC","Hex","Raw",{"option":"Hex","string":""},""]},{"op":"Regular expression","args":["User defined","[a-f0-9]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Hex","args":["Auto"]},{"op":"Drop bytes","args":[0,1925,false]},{"op":"SHA2","args":["256",64,160]}]

Recipe 35

Recipe 36 - Create a CyberChef Password Generator

Ok, so I'm kinda cheating here, as the bulk of the work is being done by an API. But it's a good example to remind you the HTTP Requests operation can be a super powerful way of augmenting CyberChef. Here I made a little 'input form' in the CyberChef input pane, and use regular expressions to capture the key paramters for the API call into Registers. A little text massage, and you can have a quick and easy generator as you need it. Saved as a recipe for when you need to deliver a quick new password to a new user.

Source: @mattnotmax

Recipe Details

[{"op":"Register","args":["(?<=number:\\s)(.*)",true,false,false]},{"op":"Register","args":["(?<=words:\\s)(.*)",true,false,false]},{"op":"Register","args":["(?<=length:\\s)(.*)",true,false,false]},{"op":"HTTP request","args":["GET","https://makemeapassword.ligos.net/api/v1/passphrase/plain?pc=$R0&wc=$R1&sp=y&maxCh=$R2","","Cross-Origin Resource Sharing",false]},{"op":"Find / Replace","args":[{"option":"Regex","string":" "},"-",true,false,true,false]}]

Recipe 36

Recipe 37 - From Sandbox zipped email to malicious URL

Most sandboxes deliver a zipped file with the generic password 'infected'. Why risk extracting out to your desktop when you can extract the contents in CyberChef? Here we have an email .eml file which includes an OLE2 file attachment. Strings identifies Base64 which is then extracted and decoded to pull out the second stage.

Source: Any.run

Recipe Details

[{"op":"Unzip","args":["infected",false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"\\n"},"",true,false,true,false]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{400,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Strings","args":["16-bit littleendian",400,"Null-terminated strings (U)",false]},{"op":"Decode text","args":["UTF-16LE (1200)"]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{2000,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Decode text","args":["UTF-16LE (1200)"]},{"op":"Extract URLs","args":[false]},{"op":"Defang URL","args":[true,true,true,"Valid domains and full URLs"]}]

Recipe 37

Recipe 38 - Planes, Skulls and Envelopes - Live and Let PowerShell

A substitution is a substitution. It can be letter for letter, letter for number, or letter for...skull? Here the obfuscation may initially look more confusing but its actually no different to other types. Find/Replce, Subsection, From Base64...all a standard day out for CyberChef. I've reversed the first section to enable extraction of the url, then continue with the deobfuscation.

Source: any.run
Credit: https://twitter.com/neonprimetime/status/1365351048525791232

Recipe Details

[{"op":"Find / Replace","args":[{"option":"Regex","string":"☠"},"B",true,false,true,false]},{"op":"Subsection","args":["[a-zA-Z0-9+/=]{300,}",true,true,false]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Decode text","args":["UTF-16LE (1200)"]},{"op":"Reverse","args":["Character"]},{"op":"Merge","args":[]},{"op":"Find / Replace","args":[{"option":"Simple string","string":"_✉✈_"},"A",true,false,true,false]},{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{300,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]}]

Recipe 38

Recipe 39 - Decrypt GoldMax aka Sunshutte encrypted configuration files

GoldMax aka Sunshuttle drops an encrypted configuration file when it executes. In the RE analysis by Microsoft and Fireeye the algorithm and keys were identified and published, making it a breeze to decrypt with CyberChef.

Source 1: https://www.microsoft.com/security/blog/2021/03/04/goldmax-goldfinder-sibot-analyzing-nobelium-malware/
Source 2: https://www.fireeye.com/blog/threat-research/2021/03/sunshuttle-second-stage-backdoor-targeting-us-based-entity.html

Recipe Details

[{"op":"From Base64","args":["A-Za-z0-9-_",true]},{"op":"AES Decrypt","args":[{"option":"UTF8","string":"hz8l2fnpvp71ujfy8rht6b0smouvp9k8"},{"option":"Hex","string":"00000000000000000000000000000000"},"CFB","Raw","Raw",{"option":"Hex","string":""}]},{"op":"Subsection","args":["[a-zA-Z0-9+/=]{50,}",true,true,false]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Merge","args":[]},{"op":"Drop bytes","args":[0,16,false]},{"op":"Take bytes","args":[0,120,false]},{"op":"Register","args":["(^.*?)\\|(.*?)\\|(.*?)\\|(.*)\\|(.*)",true,false,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":".*"},"MD5 of Execution Time:\\t\\t\\t$R0\\nLower/Upper Limit for Sleep Time:\\t$R1\\nUtilize “blend-in” traffic requests:\\t$R2\\nEnd execution timestamp:\\t\\t$R2\\nUser-agent for HTTPS requests:\\t\\t$R4",false,false,false,false]}]

Recipe 39

Recipe 40 - Morse Code Madness

Yes, there is a morse code operation in CyberChef. Yes, you may need to use it one day. Sadly this wasn't malware but still CyberChef does the job. Thanks to @pmelson and @cyber__sloth for this entry.

Source: https://pastebin.com/raw/PvLuparz
Recipe: https://twitter.com/cyber__sloth/status/1367904890157211654

Recipe Details

[{"op":"From Binary","args":["Space",8]},{"op":"From Morse Code","args":["Space","Forward slash"]},{"op":"Reverse","args":["Character"]},{"op":"ROT13","args":[true,true,false,13]}]

Recipe 40

Recipe 40a

Recipe 41 - PHP mixed hexadecimal and octal encoding

What do we want? Mixed encoding with both hexadecimal and octal in the one set! When do we want it? Now!

Source: https://twitter.com/JCyberSec_/status/1368963598475739137

Recipe Details

[{"op":"Fork","args":["\\n","\\n",false]},{"op":"Subsection","args":["\\\\x[a-fA-F0-9]{2}",true,true,false]},{"op":"From Hex","args":["\\x"]},{"op":"Merge","args":[]},{"op":"Subsection","args":["\\\\\\d{3}",true,true,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"\\\\"},"",true,false,true,false]},{"op":"From Octal","args":["Space"]}]

Recipe 41

Recipe 42 - PHP Webshell with layered obfuscation

This multi-layered webshell is a good case for subsections and jumps. You can break it into parts or complete it (as below) in a single CyberChef recipe.

Source: https://twitter.com/mattnotmax/status/1377829935780274176

Recipe Details

[{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Subsection","args":["(?<=\\\\x)([a-fA-F0-9]{2})",true,true,false]},{"op":"From Hex","args":["\\x"]},{"op":"Merge","args":[]},{"op":"Find / Replace","args":[{"option":"Regex","string":"\\\\x"},"",true,false,true,false]},{"op":"Subsection","args":["[a-zA-Z0-9+/=]{30,}=",true,true,false]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]},{"op":"From HTML Entity","args":[]},{"op":"Merge","args":[]},{"op":"Subsection","args":["[a-zA-Z0-9+/=]{30,}",true,true,false]},{"op":"Reverse","args":["Character"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Label","args":["decompress"]},{"op":"Zlib Inflate","args":[0,0,"Adaptive",false,false]},{"op":"Raw Inflate","args":[0,0,"Adaptive",false,false]},{"op":"Jump","args":["decompress",3]},{"op":"ROT13","args":[true,true,false,13]}]

Recipe 42

Recipe 43 - Magento skimmer deobfuscation

Let's face it, no-one likes to deobfuscate JavaScript. Looking at this mess of an obfuscation we probably don't need to do much to get the key info as the encoding is simple. With regex in a couple of Subsections we can deobfuscate 'in-line' quickly and get to the key data (i.e exfil domains) immediately. Then, we pass the full script for complete analysis to the new team member to finish while you get lunch...

Source: https://twitter.com/unmaskparasites/status/1370151988285992960

Recipe Details

[{"op":"Subsection","args":["(?<=\\\")([\\w\\\\]+)(?=\\\")",true,true,false]},{"op":"From Hex","args":["\\x"]},{"op":"Merge","args":[]},{"op":"Subsection","args":["(?<=\\\")([a-f0-9\\$]+)(?=\\\")",true,true,false]},{"op":"Find / Replace","args":[{"option":"Simple string","string":"$"},",",true,false,true,false]},{"op":"From Hex","args":["Comma"]}]

Recipe 43

Recipe 44 - Decrypting JobCrypter Ransomware

JobCrypter is a .NET ransomware that uses SMTP as a C2 channel. This allows an asute professional the ability to decrypt files if they have captured email traffic as the communication is not encrypted. Full analysis of this ransomware is available at Yoroi, and @malwarelab_eu provides two related recipes to decrypt files. The first uses the captured email C2 traffic to derive the encryption key, and the second applies that key to encrypted data. I particularly like the use of 'comments' in the recipes which allow a clear understanding of the recipe! Kudos!

Source: https://twitter.com/malwarelab_eu/status/1383732397510828033

Recipe 1 Details

[{"op":"Comment","args":["JobCrypter Ransomware Decryptor\n\nExtracts encryption key (96 digits) from captured email traffic\n\nDerive 3DES key as K1+K2+K1 (Keyring Option 2, see https://en.wikipedia.org/wiki/Triple_DES#Keying_options)"]},{"op":"Regular expression","args":["User defined","[0-9]{96}",true,true,false,false,false,false,"List matches"]},{"op":"MD5","args":[]},{"op":"Register","args":["([a-f0-9]{16})([a-f0-9]{16})",true,false,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"$R0$R1"},"$R0$R1$R0",true,false,true,false]}]

Recipe 44a

Recipe 2 Details

[{"op":"Comment","args":["JobCrypter Ransomware Decryptor\n\nExtracts Base64-encoded 3DES-encrypted data from encrypted .txt files and decrypts the original data"]},{"op":"Regular expression","args":["User defined","[A-Za-z0-9+/=]{32,}",false,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Triple DES Decrypt","args":[{"option":"Hex","string":"ebd3ff58ec8ebf688e6c918a95622b9febd3ff58ec8ebf68"},{"option":"Hex","string":""},"ECB","Raw","Raw"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Render Image","args":["Raw"],"disabled":true}]

Recipe 44b

Recipe 45 - Sqiud Proxy Log Timestamp Conversion

The brother of Recipe 29, and cousin of Recipe 10, here we convert squid Unix millisecond timestamp format to ISO 8601 (or whatever our choosing). A fork and subsection to isolate the timestamp and translate date and time format for the conversion. Adding .SSS keeps the fractional millisecond precision. Don't forget to 'merge' it all back if you want to continue cooking up a storm later in this recipe.

Source: https://twitter.com/mattnotmax/status/1389547145183830016
Sample Data: https://www.linuxquestions.org/questions/linux-server-73/sample-squid-proxy-log-files-837345/

Recipe Details

[{"op":"Fork","args":["\\n","\\n",false]},{"op":"Subsection","args":["^(.*?)(?=\\s)",true,true,false]},{"op":"Translate DateTime Format","args":["UNIX timestamp (seconds)","X.SSS","UTC","YYYY-MM-DDTHH:mm:ss.SSS","UTC"]}]

Recipe 45

Recipe 46 - Tailoring your regex for the situation

Here's a pretty standard script deobfuscation. You'll get some VBS script with comma separated URLs that are cycled through to download a second stage. If you want to extract the URLs, normally you'd use the 'Extract URLs' operation which give us 99% of what we want. Except the operation also picks up the trailing '.Split('');$name which looks ugly and not as easily cut and pasted or defanged.

Now the 'Extract URLs' function simply works via a regular expression, which takes into accout all the legitimate reserved characters of a URL as per the RFC. The trailing ' (where we want it to end) is included, so we get more than we wanted. But using the built in regular expression for URLs (screenshot two) and adding the ' into the negation in the syntax we can tailor the regex to our needs and get the perfect outcome!

Source: https://app.any.run/tasks/b6d9a548-722c-4066-9448-11a966be2a73/

Recipe Details

[{"op":"Regular expression","args":["User defined","[a-zA-Z0-9+/=]{30,}",true,true,false,false,false,false,"List matches"]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"Decode text","args":["UTF-16LE (1200)"]},{"op":"Regular expression","args":["User defined","\\d{2,3}",true,true,false,false,false,false,"List matches"]},{"op":"From Charcode","args":["Line feed",10]},{"op":"Extract URLs","args":[false],"disabled":true},{"op":"Regular expression","args":["URL","([A-Za-z]+://)([-\\w]+(?:\\.\\w[-\\w]*)+)(:\\d+)?(/[^.!,?\"<>\\[\\]{}\\s\\x7F-\\xFF]*(?:[.!,?]+[^.!,?'\"<>\\[\\]{}\\s\\x7F-\\xFF]+)*)?",true,true,false,false,false,false,"List matches"]},{"op":"Split","args":[",","\\n"]}]

Recipe 46a

Recipe 46b

Recipe 47 - Trickbot Visual Basic script

The malware author here has attempted to fool automated analysis by slicing the recognisable Base64 encoded PE header into character codes. Using a filter to remove junk, subsection and standard regular expressions we can extract the base64 and the DLL the script is hiding.

Source: https://twitter.com/mattnotmax/status/1394986367604695042

Recipe Details

[{"op":"Filter","args":["Line feed","^'",true]},{"op":"Subsection","args":["(?<=\\()(\\d{2,3})(?=\\))",true,true,false]},{"op":"From Charcode","args":["Space",10]},{"op":"Merge","args":[]},{"op":"Regular expression","args":["User defined","(?<=\\()([a-zA-Z0-9+/=]{1}?)(?=\\))|[a-zA-Z0-9+/=]{20,}",true,true,false,false,false,false,"List matches"]},{"op":"Find / Replace","args":[{"option":"Regex","string":"\\n"},"",true,false,true,false]},{"op":"From Base64","args":["A-Za-z0-9+/=",true]},{"op":"SHA2","args":["256",64,160]}]

Recipe 47

Recipe 48 - vjw0rm Emoji Madness

"Emojis, so hot right now", says the meme (see recipe 38 for proof) but this interesting sample found by TomU through his ongoing research into DESKTOP-group has a few tricks up its sleeve. Apart from emoji obfuscation, it downloads a snippet of code from pastee.ee which has the final key to its de-obfuscation. But it's no match for his CyberChef recipe. I've slighted edited to use a subsection and done a find/replace directly with the emoji values as these can be pasted easily into CyberChef. For those playing at home, the extra snippet of code that helps with the deobfuscation is also available in the sample zip.

Source: https://twitter.com/c_APT_ure/status/1362146658117701632

[{"op":"Subsection","args":["\\\\x[a-fA-F0-9]{2}",true,true,false]},{"op":"From Hex","args":["Auto"]},{"op":"Merge","args":[]},{"op":"Find / Replace","args":[{"option":"Regex","string":"☽☂|☚☎"},"",true,false,true,false]},{"op":"Find / Replace","args":[{"option":"Simple string","string":"'"},"\"",true,false,true,false]}]

Recipe 48

Recipe 49 - Disassemble an EICAR test file

The EICAR test file has a standard known structure of a 16 bit DOS program. Using CyberChef we can take any valid EICAR test file and break it down to its assembly. Here we use subsections (are we getting the idea that subsections are awesome yet?) and use it to capture and manipulate sections that we require. CyberChef can produce disassembly in 16, 32 or 64 bit and voilà! We've got the correct output. With thanks to Nintechnet blog for breaking down the EICAR file and helping me to understand the structure.

Source: https://blog.nintechnet.com/anatomy-of-the-eicar-antivirus-test-file/

[{"op":"Subsection","args":["(.*)(\\$.*\\$)(.*)",true,false,false]},{"op":"To Hex","args":["None",0]},{"op":"Disassemble x86","args":["16","Full x86 architecture",16,0,true,false]},{"op":"Merge","args":[]},{"op":"Subsection","args":[".*(\\$.*\\$)",true,true,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"^"},"db\\t\\t\\t\\t",true,false,true,false]},{"op":"Merge","args":[]},{"op":"Subsection","args":[".*\\$(.*)",true,true,false]},{"op":"To Hex","args":["None",0]},{"op":"Disassemble x86","args":["16","Full x86 architecture",16,0,true,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"^"},"\\n",true,false,false,false]}]

Recipe 49

Recipe 50 - Parse Security Descriptor Definition Language output

If there is one thing that is definately 'All Greek to me' it's Security Descriptor Definition Language (SDDL). Thankfully, @cnotin has created a fantastic recipe to parse SDDL output to make it much easier to understand, read, and interpret. I also like the extensive use of Comments (something that I'm always advocating, but often not implementing!) Kudos!

Source: https://twitter.com/cnotin/status/1387002797175021569

[{"op":"Comment","args":["subsection for the content before the ACE strings"]},{"op":"Subsection","args":["(.*?)\\(.*",false,true,false]},{"op":"Comment","args":["Each \"G:\" and \"D:\" on its own line"]},{"op":"Find / Replace","args":[{"option":"Regex","string":"([GD]):"},"\\n$1:",true,false,true,false]},{"op":"Comment","args":["add separator"]},{"op":"Find / Replace","args":[{"option":"Regex","string":"$"},"\\n######\\n",true,false,false,false]},{"op":"Merge","args":[]},{"op":"Comment","args":["subsection for the ACE strings"]},{"op":"Subsection","args":["######\\n(.*)",false,true,false]},{"op":"Find / Replace","args":[{"option":"Simple string","string":")("},"\\n",true,false,true,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"\\)$"},"",true,false,true,false]},{"op":"Find / Replace","args":[{"option":"Regex","string":"^\\("},"",true,false,true,false]},{"op":"Comment","args":["Add space between each permission or flag bigram"]},{"op":"Find / Replace","args":[{"option":"Regex","string":"([A-Z]{2})"},"$1 ",true,false,true,false]},{"op":"Comment","args":["Insert table header"]},{"op":"Find / Replace","args":[{"option":"Regex","string":"^"},"Type;Flags;Permissions;ObjectType;Inherited ObjectType;Trustee\\n",false,false,true,false]},{"op":"To Table","args":[";","\\n",true,"ASCII"]},{"op":"Merge","args":[]}]

Recipe 50

Training

I've developed a course 'CyberChef for Security Analysts' which contains 10 hours of instuctional videos plus labs through Applied Network Defense. To find out more visit learncyberchef.com

Resources, Books & Blog Articles

Twitter #cyberchef
CyberChef & DFIR
CyberChef Docker Image (untested!)
Static Malware Analysis with OLE Tools and CyberChef
Analyzing obfuscated Powershell with shellcode
Solving Simple Crypto Challenges with CyberChef
CyberChef: BASE64/XOR Recipe
Deciphering Browser Hieroglyphics: LocalStorage (Part 2)
Cooking with the Cyber-Chef 2020

Instructional Videos

13cubed: Cooking with CyberChef
Decoding Metasploit framework and CobaltStrike shells
Hiding Malicious code using windows CMD - Dosfuscation
Splunk TA (Technology Add-on) Example

Browser & Application Extensions/APIs

I haven't tested these, so caveat emptor.

FireFox
Chrome
Burp - SentToCyberChef
CyberSaucier
Official CyberChef Server
Splunk TA (Technology Add-on)

Presentations / Conference Talks

@GlassSec: Zero to Hero with CyberChef

Contributions

Happy to add (and learn) more. Pull request or tweet to @mattnotmax!

Please include original source of text and recipe developer (if not yourself). For consistency in pasting into CyberChef I have found the best results are to export the function as compact JSON.


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