def find_vm_entry(self): """Locate virtual machine entry point""" # VM handlers often have characteristic instruction sequences patterns = [ b'\x55\x8B\xEC\x83\xEC', # Standard prologue b'\xFF\x25', # Indirect JMP b'\xE8\x00\x00\x00\x00' # CALL $+5 ] return self.scan_memory(patterns)
// Step 1: Identify target sections msg "Starting VMProtect analysis..." base_address = mod.base() section_start = base_address + 0x1000
continue_search: // Step 5: Find IAT redirection find base_address, #FF25????????# // JMP [address] pattern cmp $result, 0 je skip_iat log "[+] IAT redirection found at: {@result}" vmprotect unpacker x64dbg
analyze_memory: log "[+] VirtualProtect called - analyzing memory region" dump esp // Examine stack for protection changes
continue_execution: run
// Step 4: Look for typical VMProtect patterns findpattern: find base_address, #558BEC83EC??53# // Common prologue pattern cmp $result, 0 je continue_search log "[+] Found potential VM handler at: {@result}"
// When VirtualProtect hits, check for memory changes check_oep: cmp eip, VirtualProtect je analyze_memory jmp continue_execution # Standard prologue b'\xFF\x25'
// Step 9: Breakpoint on section changes bp NtProtectVirtualMemory bp NtWriteVirtualMemory
not_found: log "[-] OEP not found with pattern matching" vmprotect unpacker x64dbg
// Step 7: Locate OEP after unpacking bp VirtualProtect erun // Execute until VirtualProtect is hit