Vmprotect Reverse Engineering [verified]

Reverse engineering VMProtect (VMP) is one of the steepest challenges in software security because it uses a virtual machine-based architecture

The dispatcher used a jump table to redirect to handler functions based on the VM instruction opcode. Alex found that the jump table was not properly validated, allowing him to: vmprotect reverse engineering

How VMProtect Works (The 30-Second Version)

1. Original code (e.g., cmp eax, 0x1234) is removed.
2. VM entry replaces it with a call or jmp into the VM dispatcher.
3. VM bytecode is stored in a data section – encrypted/obfuscated.
4. VM handlers interpret bytecode instructions (ADD, XOR, JCC, PUSH, etc.) using a virtual CPU (registers: VR0..VR7, VRS, VRIP).

Malware Context: Security researchers at Medium have documented building custom unpackers to extract malicious payloads hidden behind VMProtect by setting breakpoints at the Original Entry Point (OEP). GitHub - JonathanSalwan/VMProtect-devirtualization Reverse engineering VMProtect (VMP) is one of the