TLDR Tech / InfoSec
An Introduction to Module Stomping
Module Stomping is an advanced evasion technique where attackers overwrite the .text section of legitimate signed Dynamic Link Libraries (DLLs) to conceal the execution of malicious payloads within disk-backed memory regions. This method effectively bypasses behavioral telemetry and traditional memory scanners. The attack sequence involves loading a sacrificial DLL, using GetProcAddress to locate an exported function, writing shellcode to that function's address using WriteProcessMemory, and finally executing the payload via CreateThread. This process ensures that the injection remains within the legitimate module's address space. Defenders are advised to implement monitoring mechanisms that detect in-memory module divergence by comparing the loaded module bytes against their corresponding on-disk images. Techniques such as static API resolution obfuscation and PEB-walking can extend the operational lifespan of Module Stomping against mature Endpoint Detection and Response (EDR) platforms.
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