Published Jun 21, 2012|Updated Sep 15, 2017


Severe |Detected with Windows Defender Antivirus

Aliases: Rootkit.ZeroAccess.Gen.4 (VirusBuster) Trojan.Sirefef.FZ (BitDefender) Trojan.Win32.Sirefef (Ikarus) Trojan.Win32.Zapchast.acao (Kaspersky) (McAfee) Troj/Sirefef-AZ (Sophos) TROJ_SIREFEF.EM (Trend Micro)


Microsoft security software detects and removes this threat.

This family of malware uses stealth to hide its presence on your PC. Trojans in this family can do different things, including:

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

Members of the family can also change search results, which can generate money for the attackers who use Sirefef.

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

For more information, please see the Win32/Sirefef family description.


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