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98 entries found. Displaying page 3 of 5.
Updated on Jun 28, 2012
Alert level: severe
Updated on Jul 09, 2012
Alert level: severe
Updated on Jul 10, 2012

Trojan:Win32/Sirefef.AQ 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.

Caution: Win32/Sirefef is a dangerous threat that uses advanced stealth techniques in order to hinder its detection and removal. As a consequence of being infected with this threat, you may need to repair and reconfigure some Windows security features. Please see Additional remediation steps in this entry for more information.

Alert level: severe
Updated on Jul 17, 2012
Alert level: severe
Updated on Jul 26, 2012
Alert level: severe
Updated on Jul 26, 2012
Alert level: severe
Updated on Aug 13, 2012
Alert level: severe
Updated on Aug 13, 2012
Alert level: severe
Updated on Aug 13, 2012
Alert level: severe
Updated on Aug 13, 2012
Alert level: severe
Updated on Aug 13, 2012
Alert level: severe
Updated on Aug 13, 2012
Alert level: severe
Updated on Aug 15, 2012
Alert level: severe
Updated on Aug 27, 2012

Trojan:Win32/Sirefef.BC is a component of Win32/Sirefef - a multi-component family of malware that moderates your Internet experience by changing search results and generating 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 a payload.

Note: This Sirefef variant has been observed using specific ports for its peer-to-peer communications. We strongly encourage you to block access to the following ports to limit Sirefef’s communication channels and prevent additional Sirefef components being downloaded:

  • 16464
  • 16465
  • 16470
  • 16471

You can read more about how to block access to a port in this article: http://support.microsoft.com/kb/813878

Alert level: severe
Updated on Sep 26, 2012
Alert level: severe
Updated on Oct 29, 2012

Trojan:Win32/Sirefef.BE is a component of Win32/Sirefef - a multi-component family of malware that moderates your Internet experience by changing search results and generating 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 a payload.

Alert level: severe
Updated on Oct 30, 2012
Alert level: severe
Updated on Dec 05, 2012
Alert level: severe
Updated on Dec 10, 2012
Alert level: severe
Updated on Dec 27, 2012
Alert level: severe