Added Advent of Cyber 2025 Day 22

Author: nginx0

_posts/2025-12-20-tryhackme-aoc2025-day20.md

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+Learn how to exploit a race condition attack to oversell the limited-edition SleighToy.
+
 <h2 style="color:#A64AC9; text-align:center; font-weight:700; font-size:1.8em; text-shadow: 1px 0 #A64AC9, -1px 0 #A64AC9, 0 1px #A64AC9, 0 -1px #A64AC9;">
   The Story
 </h2>

_posts/2025-12-21-tryhackme-aoc2025-day21.md

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+Learn about malware analysis and forensics.
+
 <h2 style="color:#A64AC9; text-align:center; font-weight:700; font-size:1.8em; text-shadow: 1px 0 #A64AC9, -1px 0 #A64AC9, 0 1px #A64AC9, 0 -1px #A64AC9;">
   The Story
 </h2>