W32/Rbot-TV

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-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/Rbot-TV spreads to network shares with weak passwords and by exploiting the LSASS(MS04-011) vulnerability.

W32/Rbot-TV can also download and execute remote files on the infected computer and flood other computers with network packets.

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/Rbot-TV (detected as W32/Rbot-Fam) since version 3.88. W32/Rbot-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/Rbot-TV moves itself to the Windows system folder as wmstu.exe and creates the following registry entries to ensure it is run at system logon:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
*wmstu
wmstu.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run
*wmstu
wmstu.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
*wmstu
wmstu.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
*wmstu
wmstu.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\policies\Explorer\Run
*wmstu
wmstu.exe

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

HKLM\Software\Microsoft\Ole
EnableDCOM
N

HKLM\System\CurrentControlSet\Control\Lsa
restrictanonymous
1

HKLM\Software\Microsoft\Windows NT\CurrentVersion\SystemRestore
DisableSR
1

W32/Rbot-TV spreads to network shares with weak passwords and by exploiting the LSASS(MS04-011) vulnerability.

W32/Rbot-TV can also download and execute remote files on the infected computer and flood other computers with network packets.

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/Rbot-TV (detected as W32/Rbot-Fam) since version 3.88.