Sophos

W32/SdBot-MZ

Aliases
  • Backdoor.IRCBot.gen
Category
Type
What to do
Prevalence low high

Summary

 
Affected operating systems Windows
Protection available since 19 March 2004 12:20:51 (GMT)
Last updated 3 October 2005 09:53:21 (GMT)
Detected by All Sophos products
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Action

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\KTAX Auto Loader

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
KTAX Auto Loader

and delete them if they exist.

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\KTAX Auto Loader

and delete it if it exists.

Close the registry editor and reboot your computer.

More Information

W32/SdBot-MZ is a worm which spreads via network shares and existing backdoors.

The worm includes a backdoor which allows a remote attacker to control certain functions via IRC. Functions controllable by the attacker include spreading to network shares with weak passwords, spreading using the backdoor opened by W32/MyDoom-A and launching distributed denial-of-service attacks. When spreading to shares the worm uses the filename msgfix.exe. W32/SdBot-MZ is a worm which spreads via network shares and existing backdoors.

When run the worm copies itself to the file ktax.exe in the Windows system folder and ensure the file is run each time Windows starts by adding the following registry entries:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\KTAX Auto Loader
HKLM\Software\Microsoft\Windows\CurrentVersion\Run\KTAX Auto Loader

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
KTAX Auto Loader

The worm includes a backdoor which allows a remote attacker to control certain functions via IRC. Functions controllable by the attacker include spreading to network shares with weak passwords, spreading using the backdoor opened by W32/MyDoom-A and launching distributed denial-of-service attacks. When spreading to shares the worm uses the filename msgfix.exe.

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