W32/Rbot-WT

Please follow the instructions for removing worms.

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.

Check the following items

• To renable DCOM you can edit the registry, but it's better to use Dcomcnfg.exe. See Microsoft article 825750 for details.
• The HKLM\SYSTEM\CurrentControlSet\Control\Lsa\restrictanonymous = "1" setting does not allow enumeration of SAM accounts and names. The default is "0". It can be changed in Local Security Policy. See Microsoft article 246261 for details.
• Check your administrator passwords and review network security.

W32/Rbot-WT 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/Rbot-WT spreads using a variety of techniques including exploiting weak passwords on computers and SQL servers, exploiting operating system vulnerabilities (including DCOM-RPC, LSASS).

W32/Rbot-WT spreads to network shares with weak passwords as a result of the backdoor Trojan element receiving the appropriate command from a remote user.

W32/Rbot-WT moves itself to the Windows system folder as DYNITORA.EXE and creates entries in the registry at the following locations to run on Windows startup:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Dynamic Dns Binary
dynitora.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
Dynamic Dns Binary
dynitora.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Dynamic Dns Binary
dynitora.exe

W32/Rbot-WT will also set the following registry entries:

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1

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

http://www.microsoft.com/technet/security/bulletin/ms04-012.mspx
http://www.microsoft.com/technet/security/bulletin/ms04-011.mspx