AntiVirus, AntiSpyware & AntiMalware Software
1. Load packed.exe → break at 0x00401000 (stub). 2. BP on `GetProcAddress` → run → hit. 3. Continue running until a `jmp eax` with eax pointing to 0x0045A2F0. 4. Go to 0x0045A2F0 → looks like standard VC++ prologue. 5. Set Scylla: OEP = 0x0005A2F0 (RVA). 6. IAT Autosearch → found 45 imports. 7. Dump + Fix → unpacked_fixed.exe runs successfully.
(Advanced SPACK) is one of the oldest and most popular executable packers, first released in 1999. It compresses 32-bit Windows PE files (EXEs and DLLs) using a fast, proprietary algorithm. When a packed file runs, a small decompression stub embedded in the file executes first, decompresses the original code into memory, and then jumps to the original entry point (OEP).
A dumped file is usually not runnable yet. While the code is decompressed, the Import Address Table (the list of Windows functions the program uses) is broken because it relies on the dynamic memory addresses of the running process.
: Often fail on newer ASPack versions or protected variants.
Several specialized utilities have been developed to automate the detection and removal of ASPack layers.