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Alert level: Severe Detected with Windows Defender Antivirus
Also detected as: TR/Sirefef.BP.1 (Avira) Trojan.Sirefef.BP (BitDefender) Win32/Sirefef.ER trojan (ESET) ZeroAccess.dr.gen.d (McAfee) Troj/ZAccess-AB (Sophos) Trojan.Zeroaccess!inf (Symantec) TROJ_SIREFEF.KN (Trend Micro)
Trojan:Win32/Sirefef.AA is a component of Win32/Sirefef - a multi-component family of malware that moderates an affected user's Internet experience by modifying search results, and generates pay-per-click advertising revenue for its controllers. The family consists of multiple parts that perform different functions, such as downloading updates and additional components, hiding existing components, or performing the payload.