F1vm 32 Bit [ PRO | 2026 ]

ELF 32-bit LSB executable, Intel 80386, version 1 (SYSV), statically linked, stripped Check with strings :

./f1vm_32bit Output:

while True: op = mem[pc] pc += 1 if op == 0x01: # MOV reg, imm r = mem[pc]; pc += 1 imm = struct.unpack('<I', mem[pc:pc+4])[0]; pc += 4 reg[r] = imm elif op == 0x02: # ADD src = mem[pc]; dst = mem[pc+1]; pc += 2 reg[dst] += reg[src] elif op == 0x03: # XOR src = mem[pc]; dst = mem[pc+1]; pc += 2 reg[dst] ^= reg[src] elif op == 0x10: # PUSH r = mem[pc]; pc += 1 stack.append(reg[r]) elif op == 0xFF: break # ... other ops f1vm 32 bit

The VM initializes reg0 as the bytecode length, reg1 as the starting address of encrypted flag. The flag is likely embedded as encrypted bytes in the VM’s memory[] . In the binary, locate the .rodata section – there’s a 512-byte chunk starting at 0x804B040 containing the bytecode + encrypted data. ELF 32-bit LSB executable, Intel 80386, version 1

Run the binary:

25 73 12 45 9A 34 22 11 ... – that’s the encrypted flag. Write a simple emulator in Python to trace execution without actually running the binary. In the binary, locate the