W32/Sdbot-QA

Please follow the instructions for removing worms.

Check your administrator passwords and review network security.

You will also need to edit the following registry entries, if they are present. Please read the warning about editing the registry.

At the taskbar, click Start|Run. Type 'Regedit' and press Return. The registry editor opens.

Before you edit the registry, you should make a backup. On the 'Registry' menu, click 'Export Registry File'. In the 'Export range' panel, click 'All', then save your registry as Backup.

Locate the HKEY_LOCAL_MACHINE entries:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices

and remove any reference to any file you deleted.

Each user has a registry area named HKEY_USERS\[code number indicating user]\. For each user locate the entry:

HKU\[code number]\Software\Microsoft\Windows\
CurrentVersion\Run\

and remove any reference to any file you deleted.

Close the registry editor.

W32/Sdbot-QA is a worm that attempts to spread via remote network shares. The worm tries to access various network computers with shared folders using weak passwords.

W32/Sdbot-QA contains backdoor Trojan functions that allows unauthorised remote access to the infected computer via IRC channels while running in the background.

When run W32/Sdbot-QA copies itself to the Windows system folder as fbsfsdrs.exe.

The worm also creates the following registry entries so that it is able to run on user logon or computer startup:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
dvsfss = fbsfsdrs.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
dvsfss = fbsfsdrs.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
dvsfss = fbsfsdrs.exe

W32/Sdbot-QA will attempt to delete network shares, partake in DoS attacks, allow remote HTTP requests, download and run files from the internet when instructed to do so by a remote attacker.

Sophos anti-virus products since version 3.84 have been capable of detecting this worm as W32/Sdbot-Fam without requiring an update.