W32/Tirbot-D

Please follow the instructions for removing worms.

Windows NT/2000/XP/2003

In Windows NT/2000/XP/2003 you will also need to edit the following registry entry. The removal of this entry is optional in Windows 95/98/Me. 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 entry:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
IECheck
<Windows system folder>\MSDTCs.exe

and delete it if it exists.

Close the registry editor.

W32/Tirbot-D is a network worm with backdoor functionality for the Windows platform.

The worm spreads to network computers vulnerable to the LSASS vulnerability (MS04-011) and through network shares protected by weak passwords.

The backdoor component joins one of 4 predetermined IRC channels and awaits further commands from remote users. The backdoor component can then be instructed to perform the following:

Take part in distributed denial of service (DDoS) attacks
Upload/download files
Execute files
Serve as a proxy server
Harvest information from the system registry
Report filesystem information
List running processes
Scan for the presence anti-virus software
Terminate running processes
Remove registry entries W32/Tirbot-D is a network worm with backdoor functionality for the Windows platform.

The worm spreads to network computers vulnerable to the LSASS vulnerability (MS04-011) and through network shares protected by weak passwords.

The backdoor component joins one of 4 predetermined IRC channels and awaits further commands from remote users. The backdoor component can then be instructed to perform the following:

Take part in distributed denial of service (DDoS) attacks
Upload/download files
Execute files
Serve as a proxy server
Harvest information from the system registry
Report filesystem information
List running processes
Scan for the presence anti-virus software
Terminate running processes
Remove registry entries

W32/Tirbot-D will attempt to report the infection to a predefined URL.

When first run, W32/Tirbot-D copies itself to the Windows system folder as MSDTCs.exe and sets the following registry entry in order to run each time a user logs on:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
IECheck
<Windows system folder>\MSDTCs.exe

A patch is available from Microsoft for the LSASS vulnerability exploited by W32/Tirbot-D:

http://www.microsoft.com/technet/security/bulletin/ms04-011.mspx