Ekko

A Windows x64 C proof of concept for in-memory sleep obfuscation. It uses timer-queue callbacks and an NtContinue context chain to set the main image to PAGE_READWRITE, encrypt it with SystemFunction032 using a fixed 16-byte 0x55 key, wait, decrypt it, and restore PAGE_EXECUTE_READWRITE. The standalone sample repeats a fixed four-second cycle. The archived upstream project warns that the implementation has known flaws and should not be copied into implants without understanding and fixing them.