Exforel Backdoor Implemented At Network Driver Interface Specification level

Dec 10, 2012 | comments

Security researchers have identified a variant of the Exforel backdoor malware, VirTool:WinNT/Exforel.A, that’s somewhat different from other malicious elements of this kind.

The NDIS-level backdoor used by VirTool:WinNT/Exforel.A is much more low-level and stealthy than that used by traditional backdoors – there is no connecting/listening port so it is more difficult to notice. The backdoor traffic is completely invisible to user-mode applications.

  • Uploading files
  • Downloading files
  • Executing files
  • Routing TCP/IP packets

This sample appears to be used for a specific attack targeting a certain organization.

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