Advent of Cyber 2025 Day 21 — Malware Analysis Bonus Challenge

A walkthrough of the TryHackMe Advent of Cyber 2025 Day 21 bonus challenge: peeling back a multi-layer HTA payload through VBScript analysis, Base64 decoding, and XOR decryption to uncover a hidden PNG.

December 21, 2025 · 5 min · Matt Swann