Secrets of the Comfoo Masters

Secrets of the Comfoo Masters analyzes the Comfoo backdoor, an APT-era RAT in active development since at least 2006, detailing its persistence by replacing DLLs in existing services, DNS and HTTP-based C2, a range of capabilities (system and network information gathering, keystroke logging, screenshots, file upload/download/execute), infrastructure, and the global set of victims across government and industry, together with detection approaches and defensive recommendations for sustained cyber-espionage campaigns.