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W32.Gaobot.ZX

Risk Level 2: Low

Discovered:
April 12, 2004
Updated:
February 13, 2007 12:21:17 PM
Also Known As:
Backdoor.Agobot.lq [Kaspersky]
Type:
Worm
Systems Affected:
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows Server 2003, Windows XP


W32.Gaobot.ZX is a minor variant of W32.Gaobot.SY. This worm attempts to spread through network shares with weak passwords, and it also allows attackers to access an infected computer using a predetermined IRC channel.

The worm uses multiple vulnerabilities to spread, including:
This variant is often compressed with Yoda's Cryptor, PE_Patch, and UPX.

Note: Virus definitions released April 16, 2004 contained a modification to this detection to account for the discovery of a minor variant.

Antivirus Protection Dates

  • Initial Rapid Release version April 13, 2004
  • Latest Rapid Release version September 28, 2010 revision 054
  • Initial Daily Certified version April 13, 2004
  • Latest Daily Certified version September 28, 2010 revision 036
  • Initial Weekly Certified release date April 14, 2004
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.

Threat Assessment

Wild

  • Wild Level: Medium
  • Number of Infections: 50 - 999
  • Number of Sites: More than 10
  • Geographical Distribution: Low
  • Threat Containment: Easy
  • Removal: Moderate

Damage

  • Damage Level: Medium

Distribution

  • Distribution Level: Medium
Writeup By: Maryl Magee

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