1. Symantec/
  2. Security Response/
  3. W32.HLLW.Gaobot


Risk Level 2: Low

October 22, 2002
February 13, 2007 11:56:04 AM
Also Known As:
W32/Gaobot.worm [McAfee], WORM_GAOBOT
Systems Affected:
Windows 2000, Windows 95, Windows 98, Windows Me, Windows NT, Windows XP

W32.HLLW.Gaobot is a worm that copies itself as %system%\Sysldr32.exe.

It then connects to an IRC server and listens for commands. By default, the worm will connect on ports 6,667 and 9,900. Some of the commands that it supports include commands to spread itself, using popular file sharing programs such as Kazaa, Bearshare, and Grokster. It shares itself as some of the following file names:
  • Kylie Minogue is very horny atm - XXX.exe
  • Cameron Diaz's webcam - cracked access - no cost - XXX.exe
  • Hoyle Card Games 2003 crack (all versions).exe
  • Warcraft 3 - Cable Modem Playfix.exe
  • Delta Force Black Hawk Down - Item Hack.exe

The worm also attempts to spread to all computers on the network, using a utility that connects to a remote computer on port 445, it copies the Woinggg.exe file across the network, and then executes it.

Antivirus Protection Dates

  • Initial Rapid Release version October 22, 2002
  • Latest Rapid Release version October 18, 2016 revision 016
  • Initial Daily Certified version October 22, 2002
  • Latest Daily Certified version October 20, 2016 revision 001
  • Initial Weekly Certified release date October 23, 2002
Click here for a more detailed description of Rapid Release and Daily Certified virus definitions.
Writeup By: Douglas Knowles

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STAR Antimalware Protection Technologies
2016 Internet Security Threat Report, Volume 21
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