Heur.CFG A Malware Uses Encryption to Hide Its Intentions


The Dell Sonicwall Threats Research team observed reports of a New Malware family named GAV: Heur.CFG actively spreading in the wild. This time attacker uses Self-Signed encryption for C&C data communication to avoid detection by Anti-Virus programs.

Infection Cycle:

The Malware uses the following icon:


  • 9F5DF82346249748F6C4A2E681BC33D3

The Malware adds the following keys to the Windows registry to ensure persistence upon reboot:

  • HKLMSOFTWAREMicrosoftWindowsCurrentVersionRun

    • Armour =%Userprofile%Malware.exe

Once the computer is compromised, the malware starts to communicate with its own domains via following format:

The malware tries to communicate with its own C&C server such as following IPs:

The Malware uses Self-Signed encryption for C&C data communication to avoid detection by Anti-Virus programs, here is an example:

The Malware tries to download some SWF Adobe Flash and executable files from following domains:

Command and Control (C&C) Traffic

Heur.CFG performs C&C communication over 80, 3009 and 23466 ports. The malware sends your system information to its own C&C server via following format, here are some examples:

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

  • GAV: Heur.CFG (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.