BITSCTF 2026 Writeups | OSINT And Steganography / Forensics Challenges Solving OSINT And Steganography challenges in BITSCTF 2026 Using zsteg , cyberchef , reverse image search , strings , exiftool …

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InfoSec Write-ups

Writeups for BITSCTF 2026 covering OSINT and steganography/forensics challenges. The OSINT challenge involves identifying a Copenhagen landmark post-fire, using Google Maps Street View and What3Words to decode a geocoded flag. The steganography challenges involve multi-step techniques: extracting hidden files with binwalk, LSB analysis with zsteg, XOR decryption via CyberChef, and executing Malbolge esoteric code. A second stego challenge requires extracting byte layers from a 64-bit floating-point TIFF using Python/NumPy, navigating a decoy QR code, and using GIMP color threshold adjustments to reveal a fragmented flag.