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extrac32 - for self-extracting archives (cabinets) #388

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extrac32 - for self-extracting archives (cabinets) #388

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TAbdiukov
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@TAbdiukov TAbdiukov commented Aug 9, 2024 •
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I'm not sure if this counts as LOLBAS

  • [-] the main file is copy.exe, not extrac32.exe
  • [+] This usage of EXE is undocumented
  • [-] In reality, EXEs are probably more likely to trip detection than .CAB
  • [+] For an attacker, it can be useful for covert extractions of payloads without command-line arguments (while maintaining the use of Microsoft EXEs for its headers)

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Example file,
file3.zip

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TAbdiukov commented Aug 16, 2024 •
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Another example file, obtained on Windows XP with the following one-liner,

copy /b "C:\WINDOWS\system32\extrac32.exe"+"C:\WINDOWS\pchealth\helpctr\binaries\pchdt_w3.cab" number2.exe

number2.zip

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