CTF Challenges
38 challenges
AMOS
Inspired by real-world obfuscation techniques used in the AMOS Stealer malware, this challenge hides a flag using a...
The ROT Side
ROT13 is childs play. But what about its more obscure cousin that handles the full printable ASCII range? Ciphertext:
Double Trouble
Sometimes attackers apply the same encoding multiple times to evade detection. Simple but effective. Ciphertext:
Compressed Thoughts
Malware authors love compression. The magic bytes 1f 8b are your friend. Ciphertext:
Inflate the Truth
Zlib is gzips cousin - commonly used in HTTP compression and many file formats. Ciphertext:
Legacy Auth
An old authentication daemon was discovered running on an internal server. The sysadmin claims it's been there "since...
Malware Style Obfuscation
Final boss. Modeled after real IoT malware like Mozi. Ciphertext:
Matryoshka Payload
Like Russian nesting dolls, each layer reveals another. Ciphertext: