Reverse Engineering
RE
Static and dynamic reverse engineering of native binaries: keygen-style logic, ELF anti-analysis tricks, and defeating Mixed Boolean-Arithmetic obfuscation in a bytecode VM.
- Secure Vault Two traps: (1) the SHA-256 password prompt, and (2) a decoy flag it reveals. The real flag is encoded inside the ELF program-header table and only reconstructed when the binary is run with a command-line argument.
- Logic Bypass The program asks for an "access key". If an internal check passes it prints [ACCESS GRANTED] and then a flag. The twist (and the intended lesson, stated in the banner: "the decision is made here, not by a memory corruption bug") is that…
- Algebraic Nightmare x86-64, dynamically linked, stripped. SHA-256 44d57c21ef06c5efcbc2b59daa064e5073870252f111d2cbc9f08b53569662ba.
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