# crack_patch_demo.py # Simulates a "crack me" program, then patches it automatically import sys import re def target_program(password): # Hardcoded check (the "vulnerability") if password == "supersecret123": print("[ACCESS GRANTED]") return True else: print("[ACCESS DENIED]") return False ---------- CRACKING PART ---------- def crack_password_bruteforce(): # Simulated cracking: dictionary attack dictionary = ["admin", "123456", "supersecret123", "letmein"] for pwd in dictionary: print(f"[CRACK] Trying: {pwd}") # Normally you'd call the target function, but here we simulate result if pwd == "supersecret123": print(f"[CRACK] Found valid password: {pwd}") return pwd return None ---------- PATCHING PART (in-memory monkey patch) ---------- def patch_target_function(): # This replaces the target's hardcoded check with a bypass original_check = target_program
if found_pwd: print(f"\n=== Using cracked password ===") target_program(found_pwd) cracking patching
def patched_check(password): print("[PATCHED] Always granting access") return True # Bypass # crack_patch_demo
# Apply patch globals()['target_program'] = patched_check print("[PATCH] Target function patched successfully") if name == " main ": print("=== Cracking Phase ===") found_pwd = crack_password_bruteforce() new_bytes): with open(filename
print("\n=== Patching Phase ===") patch_target_function() target_program("any_wrong_password") # Should now succeed (modify an executable file): # simple_binary_patcher.py # Example: patches a specific byte in a .exe or binary file def patch_file(filename, offset, original_bytes, new_bytes): with open(filename, "r+b") as f: f.seek(offset) current = f.read(len(original_bytes)) if current == original_bytes: f.seek(offset) f.write(new_bytes) print(f"[PATCH] Patched {original_bytes.hex()} -> {new_bytes.hex()} at offset {hex(offset)}") else: print(f"[ERROR] Bytes at offset {hex(offset)} do not match expected: {current.hex()}") Example: change JE (0x74) to JMP (0xEB) in x86 (bypass condition) patch_file("target.exe", offset=0x1234, original_bytes=b'\x74\x0A', new_bytes=b'\xEB\x0A') If you meant self-patching / anti-debug : # self_patching_example.py import sys def self_modify(): with open(sys.argv[0], 'rb') as f: code = f.read()