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Discovered:
- December 22, 2011
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Updated:
- November 9, 2012 3:15:51 PM
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Type:
- Trojan
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Infection Length:
- Varies
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Systems Affected:
- Windows 2000, Windows 7, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows Server 2008, Windows Vista, Windows XP
Trojan.Zeroaccess.B is a Trojan horse that uses an advanced rootkit to hide itself. It can also create a hidden file system, download more malware, and open a back door on the compromised computer.
Note: The behavior of this threat on 32-bit computers is almost identical to
Trojan.Zeroaccess.
For more information, please see the following resource:
Trojan.ZeroaccessAntivirus Protection Dates
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Initial Rapid Release version December 22, 2011 revision 025
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Latest Rapid Release version April 23, 2013 revision 032
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Initial Daily Certified version December 22, 2011 revision 032
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Latest Daily Certified version April 24, 2013 revision 003
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Initial Weekly Certified release date December 28, 2011
Click for a more detailed description of Rapid Release and Daily Certified virus definitions.
Threat Assessment
Wild
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Wild Level: Low
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Number of Infections: 0 - 49
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Number of Sites: 0 - 2
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Geographical Distribution: Low
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Threat Containment: Easy
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Removal: Difficult
Damage
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Damage Level: Medium
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Payload: Opens a back door.
Downloads more malware.
Writeup By: Karthik Selvaraj and Rong Zhou
