XploitX CTF 2026

Base64-decodes to tw1n_f4c3s_4r3_h4rd ("twin faces are hard").

Incident Case File: #2026-2184-GAMMA | PORT 0xBEEF (HYPER-NESTED) Category: Networking / Network Forensics / Cryptography Target Flag Format: XploitX[beta]{...} (decoded as XploitXβ{...})

Binary protocol: u32 command | args, reply u32 status | u64 value (cmd 5 replies with two qwords: arena base + code pointer).

The challenge is a chain of nested archives ("nested stream package").

The MIDI file is a container. A ZIP is appended after the MIDI tracks, and inside it is a PNG whose top three pixel rows hide the flag as a 1-bit-per-pixel bitmap. The other files are…

file on double_exposure.jpg reveals a JPEG comment: