VIPERTUNNEL Python Backdoor Exploits Fake DLL for Stealth Access

• •VIPERTUNNEL is a stealthy Python backdoor hidden in a fake DLL file.
• •The malware uses a SOCKS5 proxy to maintain persistent access to networks.
• •A sitecustomize.py file allows the backdoor to execute code without user input.

A Python backdoor named VIPERTUNNEL is being utilized by hackers to infiltrate enterprise networks. The malware is concealed within a fake DLL file and employs a multi-stage obfuscated loader to evade detection. Once installed, VIPERTUNNEL establishes a SOCKS5 proxy tunnel to a remote command-and-control server, allowing attackers to maintain persistent access to compromised systems. The backdoor's persistence is achieved through a sitecustomize.py file located in C:\ProgramData\cp49s\Lib\, which executes automatically at Python interpreter startup. This method enables the execution of malicious code without user interaction. Organizations are urged to be vigilant as the malware targets enterprise environments, posing a significant risk to network security. Current status indicates ongoing exploitation of this backdoor, with no specific mitigation measures detailed in the articles.