W32/Sdbot-TV

Category: Viruses and Spyware
Type: Win32 worm
Prevalence: Small Number of Reports

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W32/Sdbot-TV is a network worm which contains IRC backdoor Trojan functionality, allowing unauthorised remote access to the infected computer.

W32/Sdbot-TV also drops a file detected as Troj/Ranck-CB.

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/Sdbot-TV (detected as W32/Sdbot-Fam) since version 3.89. W32/Sdbot-TV is a worm which attempts to spread to remote network shares. It also contains backdoor Trojan functionality, allowing unauthorised remote access to the infected computer via IRC channels while running in the background as a service process.

W32/Sdbot-TV drops two files to the WinNT\system32 folder. One is dropped as QAVANT.EXE and is also detected as W32/Sdbot-TV, the other is dropped as QAVBAP.EXE and is detected as Troj/Ranck-CB.

The file dropped as QAVANT.EXE copies itself to a file called VAGQSQS.EXE in the Windows system folder and creates entries in the registry at the following locations to run this copy on system startup:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
HKCU\Software\Microsoft\Windows\CurrentVersion\Run

W32/Sdbot-TV spreads to network shares with weak passwords as a result of the backdoor Trojan element receiving the appropriate command from a remote user, spreading by copying the file XENINT.EXE from the Windows system folder (which should be the original W32/Sdbot-TV dropper file) to the remote machine.

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/Sdbot-TV (detected as W32/Sdbot-Fam) since version 3.89.