FakeAV.DBG: A Malware uses Windows Sysinternals name to avoid detection (Feb 2, 2016)


The Dell Sonicwall Threats Research team observed reports of a New Malware family named GAV: FakeAV.DBG actively spreading in the wild. This time attackers used fake name such as Sysinternals Debug Output Viewer for their malware to avoid detection by users. Sysinternals is a part of the Microsoft TechNet website which offers technical resources and utilities to manage, diagnose, troubleshoot, and monitor a Microsoft Windows environment.

Infection Cycle:

The Malware uses the following icon:


  • b11f23f988d7e8ea3664ef292f8f6d2b

The Malware adds the following files to the system:

  • Malware.exe

    • C:Program FilesCommon Filessochvst.exe [Detected as GAV: FakeAV.DBG (Trojan)]

The Malware adds the files to Windows start-up folder to ensure persistence upon reboot:

  • %Userprofile%Start MenuXnz.url [ Auto Start-up file ]

  • %Userprofile%Start MenuXnv.url [ Auto Start-up file ]

Once the computer is compromised, the malware copies its own files to User and Startup folders.

The Xnz.url and Xnv.url files dropped after malware launches on the target system, here is an example:

The malware uses a DLL Injection to avoid detection by Anti-Virus programs. Here is an example:

The Malware installs key Logger on the target machine and extracts valuable information such as pressed keys like following example:

Command and Control (C&C) Traffic

FakeAV.DBG performs C&C communication over 5133 port. The malware sends your system information to its own C&C server via following format, here is an example:

SonicWALL Gateway AntiVirus provides protection against this threat via the following signature:

  • GAV: FakeAV.DBG (Trojan)

Security News
The SonicWall Capture Labs Threat Research Team gathers, analyzes and vets cross-vector threat information from the SonicWall Capture Threat network, consisting of global devices and resources, including more than 1 million security sensors in nearly 200 countries and territories. The research team identifies, analyzes, and mitigates critical vulnerabilities and malware daily through in-depth research, which drives protection for all SonicWall customers. In addition to safeguarding networks globally, the research team supports the larger threat intelligence community by releasing weekly deep technical analyses of the most critical threats to small businesses, providing critical knowledge that defenders need to protect their networks.