CTF Writeups

Forensics, malware analysis, incident response, and more from competitions worldwide.

CTF Writeup

Securinets 2025 — Lost File

Ransomware-style challenge requiring memory capture analysis and reverse engineering of an encryption tool to recover a deleted key.

Memory Forensics Reverse Engineering IDA Pro Cryptography
Hard Memory Forensics • Encryption Recovery ⏱ 3 min
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CTF Writeup

Securinets 2025 — Recovery

Analysis of a DNS-based covert channel used for data exfiltration and ransomware delivery. Includes malware reconstruction and custom LCG decryption.

Network Analysis DNS Exfiltration Reverse Engineering Ransomware
Hard Network Forensics • Malware Reassembly ⏱ 2 min
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