Introduction
During the WIZ Cloud Security Championship, I encountered a fascinating malware analysis challenge called “Malware Busters.” The scenario presented us with terminal access to a compromised environment containing a suspicious binary named “buu.” This writeup details the complete analysis workflow—from safe extraction and manual unpacking through reverse engineering, configuration decryption, and ultimately intercepting C2 communications to capture the flag.
This challenge showcased several realistic malware techniques including modified UPX packing, configuration obfuscation, and encrypted command-and-control (C2) communications. Let’s dive into the technical details.