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Windows Defender Anti-virus Bypassed Using Direct Syscalls & XOR Encryption (cybersecuritynews.com)

submitted 3 days ago* (last edited 2 days ago) by [email protected] to c/[email protected]

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"According to the research published by Hackmosphere, the technique works by avoiding the conventional execution path where applications call Windows API functions through libraries like kernel32.dll, which then forwards requests to ntdll.dll before making the actual system call to the kernel."

Additional Information:

https://www.hackmosphere.fr/bypass-windows-defender-antivirus-2025-part-1/

https://www.hackmosphere.fr/bypass-windows-defender-antivirus-2025-part-2/

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[–] [email protected] 4 points 3 days ago

Btw I wasn't aware XOR was encrytion...

It's even better than ROT13, because you always need to apply ROT13 twice for getting the good results...