Symantec.com > Security Response > Trojan.Webloin

Trojan.Webloin

Risk Level 1: Very Low

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Discovered: May 19, 2005
Updated: February 13, 2007 12:39:03 PM
Also Known As: Backdoor.Win32.PcClient.aj [Ka, BackDoor-CKB [McAfee]
Type: Trojan Horse
Systems Affected: Windows 2000, Windows NT, Windows Server 2003, Windows XP


Trojan.Webloin is a Trojan horse that periodically downloads a .dll file from predetermined URLs. The Trojan executes the .dll file and deletes it. The Trojan is configurable and the URLs and file names may vary. The Trojan will only run successfully on computers running Windows NT/2000/XP/2003.

Protection

  • Initial Rapid Release version May 19, 2005
  • Latest Rapid Release version June 21, 2008 revision 020
  • Initial Daily Certified version May 19, 2005
  • Latest Daily Certified version June 21, 2008 revision 021
  • Initial Weekly Certified release date May 24, 2005

Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment

Wild

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

Damage

  • Damage Level: Low

Distribution

  • Distribution Level: Low

Writeup By: Masaki Suenaga
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