Cr4CK3DD / CallStackSpoofer

Stack Spoofing PoC

Suppressor

Stack spoofing

• Stack spoofing is a really cool malware technique that isn’t new, but has been receiving some more attention recently.
• The method i used simply involves pushing ret gadget from loaded DLL and return address to our function (Suppressor).

why using stack spoofing technique?

• EDRs utilize the call stack of a function call to determine whether a function is malicious or not, by verifying that the caller’s return address resolves to a loaded module.

• Indirect syscall without stack spoofing technique:

• Indirect syscall with stack spoofing technique:

Resources & References:

• x64 return address spoofing source explanation.
• reflective call stack detections evasions.
• DEF CON 30 - Kyle Avery
• Adding x86, x64 Assembly Language code to the Visual Studio C++ project.
• BokuLoader.
• AceLdr.