1. /
  2. Security Response/
  3. Backdoor.Winnti


Risk Level 1: Very Low

October 27, 2011
April 12, 2013 2:42:39 AM
Also Known As:
Troj/Winnti-B [Sophos]
Systems Affected:
Windows 2000, Windows 7, Windows NT, Windows Server 2003, Windows Server 2008, Windows Vista, Windows XP
CVE References:
Backdoor.Winnti is a Trojan horse that opens a back door on the compromised computer.

Antivirus Protection Dates

  • Initial Rapid Release version October 27, 2011 revision 051
  • Latest Rapid Release version May 4, 2015 revision 009
  • Initial Daily Certified version October 28, 2011 revision 002
  • Latest Daily Certified version April 14, 2015 revision 021
  • Initial Weekly Certified release date November 2, 2011
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment


  • Wild Level: Low
  • Number of Infections: 0 - 49
  • Number of Sites: 0 - 2
  • Geographical Distribution: Low
  • Threat Containment: Easy
  • Removal: Easy


  • Damage Level: Medium
  • Payload: Opens a back door on the compromised computer.
  • Releases Confidential Info: Steals information from the compromised computer.


  • Distribution Level: Low
Note: On May 14, 2015, modifications will be made to the threat write-ups to streamline the content. The Threat Assessment section will no longer be published as this section is no longer relevant to today's threat landscape. The Risk Level will continue to be the main threat risk assessment indicator.
Writeup By: Santiago Cortes and Nino Fred Gutierrez

Search Threats

Search by name
Example: W32.Beagle.AG@mm
STAR Antimalware Protection Technologies
Internet Security Threat Report