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Learning Aid - Top Base64 Encodings Table

Learning Aid - Top Base64 Encodings Table

MITRE ATT4CK - T1132 - Data Encoding

Base64 Code Mnemonic Aid Decoded* Description
JAB 🗣 Jabber $. Variable declaration (UTF-16)
TVq 📺 Television MZ MZ header
UEs 🏬 Upper East Side PK ZIP, Office documents
SUVY 🚙 SUV IEX PowerShell Invoke Expression
SQBFAF 🐣 Squab favorite I.E. PowerShell Invoke Expression (UTF-16)
PAA 💪 "Pah!" <. Often used by Emotet (UTF-16)
cwBhA 🦁 Chewbaka s.a. Often used in malicious droppers (UTF-16) 'sal' instead of 'var'
aWV4 Awe version 4 iex PowerShell Invoke Expression
aQBlA 💦 Aqua Blah (aquaplaning) i.e. PowerShell Invoke Expression (UTF-16)
R2V0 🤖 R2D2 but version 0 Get Often used to obfuscate imports like GetCurrentThreadId
dmFy 👹 defy / demonify var Variable declaration
dgBhA debugger + high availability v.a. Variable declaration (UTF-16)
dXNpbm Dixon problem usin Often found in compile after delivery attacks
H4sIA 🚁 HForce (Helicopter Force) I agree gzip magic bytes (0x1f8b), e.g. echo 'test' | gzip -cf | base64

* the . stands for 0x00

Cyber Chef Recipe

https://gchq.github.io/CyberChef/#recipe=Fork('%5C%5Cn','%5C%5Cn',false)From_Base64('A-Za-z0-9%2B/%3D',true)&input=SkFCClRWcQpQQUEKU1VWWQpTUUJGQUYKYVdWNAphUUJsQQpSMlYwCmRtRnkKZGdCaEEKY3dCaEEKZFhOcGJtCkg0c0lBRldXc2wwQUF5dEpMUzdoQWdER05iazdCUUFBQUE9PQ

References

Tweet

Tweet and Thread https://twitter.com/cyb3rops/status/1187341941794660354

JAB

https://www.hybrid-analysis.com/sample/ce0415b6661ef66bbedb69896ad1ece9ee4e6dfde9925e9612aec7bbf1cb7bc5?environmentId=100

PAA

Emotet process command line https://app.any.run/tasks/dfba6d53-7a93-4d8b-86ba-4e737ad06b06/

cwBha

Explanation https://threat.tevora.com/5-minute-forensics-decoding-powershell-payloads/

Sample https://www.hybrid-analysis.com/sample/b744129bfe54de8b36d7556ddfcc55d0be213129041aacf52b7d2f57012caa60?environmentId=100

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