W32/Rbot-QU

Please follow the instructions for removing worms.

Sophos's anti-virus products include proactive protection technology, which can defend against new threats without requiring an update. Sophos customers have been protected against W32/Rbot-QU (detected as W32Rbot-Fam) since version 3.88.

W32/Rbot-QU is a network worm and IRC backdoor Trojan for the Windows platform.

W32/Rbot-QU spreads using a variety of techniques including exploiting weak passwords on computers and SQL servers, exploiting operating system vulnerabilities (including DCOM-RPC, LSASS, WebDAV and UPNP) and using backdoors opened by other worms or Trojans.

W32/Rbot-QU can be controlled by a remote attacker over IRC channels. The backdoor component of W32/Rbot-QU can be instructed by a remote user to perform the following functions:

start an FTP server
start a Proxy server
start a web server
take part in distributed denial of service (DDoS) attacks
log keypresses
capture screen/webcam images
packet sniffing
port scanning
download/execute arbitrary files
start a remote shell (RLOGIN)

The worm copies itself to a file named wrauclt.exe in the Windows system folder and creates the following registry entries:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
*windows update
wrauclt.exe

HKLM\Sofrware\Microsoft\Windows\CurrentVersion\Run\
*windows update
wrauclt.exe

HKLM\Sofrware\Microsoft\Windows\CurrentVersion\RunServices\
*windows update
wrauclt.exe

HKLM\Sofrware\Microsoft\Windows\CurrentVersion\policies\Explorer\Run\
*windows update
wrauclt.exe

Patches for the operating system vulnerabilities exploited by W32/Rbot-QU can be obtained from Microsoft at:

http://www.microsoft.com/technet/security/bulletin/ms04-011.mspx
http://www.microsoft.com/technet/security/bulletin/ms03-039.mspx
http://www.microsoft.com/technet/security/bulletin/ms03-007.mspx
http://www.microsoft.com/technet/security/bulletin/ms01-059.mspx