W32/Rbot-OF

Please follow the instructions for removing worms.

Change any data that may have become compromised.

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-OF is a network worm and IRC backdoor Trojan for the Windows platform. When first run the worm copies itself to the Windows system folder as wuarclt.exe and creates the following registry entries to run itself on system startup:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
windows update = wuarclt.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
windows update = wuarclt.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
windows update = wuarclt.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\
windows update = wuarclt.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer\Run\
windows update = wuarclt.exe

The backdoor component joins an IRC channel where it awaits further commands from a remote user. The backdoor component can be instructed to perform the following functions:

start an HTTP server
start an FTP server
send email
log keypresses
capture screen/webcams
download/execute arbitrary files
start a port scanner
provide remote shell access (RLOGIN)
start a proxy server (SOCKS4)

The worm may also set the following registry entries:

HKLM\Software\Microsoft\Ole\
EnableDCOM = "N"

HKLM\System\CurrentControlSet\Control\Lsa\
restrictanonymous = dword:00000001

W32/Rbot-OF spreads through various operating system vulnerabilities and
through network shares protected by weak passwords. Patches for the operating system vulnerabilities exploited by W32/Rbot-OF can be obtained from Microsoft at:

http://www.microsoft.com/technet/security/bulletin/ms04-011.mspx
http://www.microsoft.com/technet/security/bulletin/ms03-039.mspx
http://www.microsoft.com/technet/security/bulletin/ms03-007.mspx
http://www.microsoft.com/technet/security/bulletin/ms01-059.mspx