DEEP#DOOR: Unveiling the Python Backdoor Exploiting Tunneling Services
In April 2026, cybersecurity researchers identified a sophisticated Python-based backdoor framework named DEEP#DOOR targeting Windows systems. The attack initiates with an obfuscated batch script that disables Windows security features and extracts an embedded Python payload, establishing persistence through multiple mechanisms such as startup folder entries, registry run keys, and scheduled tasks. The malware communicates with attacker infrastructure via a public TCP tunneling service, enabling remote command execution and extensive surveillance capabilities, including keylogging, screenshot capture, and credential harvesting from browsers and cloud services. DEEP#DOOR employs advanced evasion techniques, including sandbox and virtual machine detection, to avoid detection and complicate incident response efforts. This incident underscores the evolving sophistication of threat actors who leverage fileless, script-driven intrusion frameworks that utilize native system components and interpreted languages like Python. The use of public tunneling services for command-and-control communications highlights a trend towards minimizing forensic footprints and blending malicious traffic with legitimate network activity, posing significant challenges for traditional detection methods.
Kill Chain
