Windows Defender Anti-virus Bypassed Using Direct Syscalls & XOR Encryption
Windows Defender Anti-virus Bypassed Using Direct Syscalls & XOR Encryption
cybersecuritynews.com
Windows Defender Antivirus Bypassed Using Direct Syscalls & XOR Encryption
"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/
Anything like this for the typical home user?
Sure, bring back Crowdstrike, that went well...
Btw I wasn't aware XOR was encrytion...
XOR cleartext once with a key you get ciphertext. XOR the ciphertext with the same key you get the original cleartext. At its core this is the way the old DES cipher works.
A bit of useful trivia: If you XOR any number with itself, you get all zeros. You can see this in practice when an assembly programmer XOR's a register with itself to clear it out.
https://en.wikipedia.org/wiki/One_time_pad
XOR may be the only encryption system that cannot be cracked. The length of the key is a PITA though.
It technically counts. It's a cipher that uses the same key for encryption and decryption.
It's even better than ROT13, because you always need to apply ROT13 twice for getting the good results...