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  3. W32.Korgo.U


Risk Level 2: Low

June 22, 2004
February 13, 2007 12:24:31 PM
Also Known As:
Worm.Win32.Padobot.l [Kaspersk, W32/Korgo.worm.u [McAfee], WORM_KORGO.U [Trend], Win32.Korgo.W [Computer Associ, W32/Korgo-Fam [Sophos]
Systems Affected:
Windows 2000, Windows XP

W32.Korgo.U is a variant of W32.Korgo.N. This worm attempts to propagate by exploiting the Microsoft Windows LSASS Buffer Overrun Vulnerability (described in Microsoft Security Bulletin MS04-011) on TCP port 445. It also listens on TCP ports 113, 5111, and a random port between 256 and 8191.

  • Definitions dated prior to June 28, 2004 detect this threat as W32.Korgo.O.
  • Symantec Security Response has developed a removal tool to clean the infections of W32.Korgo.U.

Antivirus Protection Dates

  • Initial Rapid Release version June 22, 2004
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version June 22, 2004
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date June 23, 2004
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: 3 - 9
  • Geographical Distribution: Low
  • Threat Containment: Easy
  • Removal: Moderate


  • Damage Level: Medium


  • Distribution Level: Medium
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.

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