Description published Apr 12, 2012|Description updated Jul 13, 2017

Trojan:Win32/Sirefef

Alert level: Severe Detected with Windows Defender Antivirus

Also detected as: ZeroAccess (other) Zero Access (other)

Microsoft security software detects and removes this threat.

This threat is a member of the Win32/Sefnit family. This family can hide on your PC and do different things, including:

  • Downloading and running other files
  • Contacting remote hosts
  • Disabling security features

They can also change your search results, which can generate money for malicious hackers.

Variants of Win32/Sirefef might be installed by other malware, including variants of the Trojan:Win32/Necurs family.

 

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