W32/Rbot-CQ

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 entry:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Task Debugger = sysdll.exe

and delete it if it exists.

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\Task Debugger = sysdll.exe

and delete it if it exists.

Close the registry editor.

• Check your administrator passwords and review network security.
• 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.
• W32/Rbot-CQ disables administrative shares. Renable them if required.
• W32/Rbot-CQ also disables the Remote Registry service, Windows Messenger and the Telnet Service. Renable them if required.

W32/Rbot-CQ 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-CQ 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-CQ copies itself to the Windows system folder as SYSDLL.EXE and creates entries at the following locations in the registry so as to run itself on system startup:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Task Debugger = sysdll.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
Task Debugger = sysdll.exe

W32/Rbot-CQ may set the following registry entries:

HKLM\SYSTEM\ControlSet001\Services\lanmanserver\parameters\
AutoShareWks = 0
AutoShareServer = 0

HKLM\SYSTEM\ControlSet001\Services\lanmanworkstation\parameters\
AutoShareWks = 0
AutoShareServer = 0

HKLM\SYSTEM\CurrentControlSet\Services\lanmanserver\parameters\
AutoShareWks = 0
AutoShareServer = 0

HKLM\SYSTEM\CurrentControlSet\Services\lanmanworkstation\parameters\
AutoShareWks = 0
AutoShareServer = 0

HKLM\SOFTWARE\Microsoft\Ole\
EnableDCOM = N

HKLM\SYSTEM\CurrentControlSet\Control\Lsa\
restrictanonymous = 1

HKLM\SYSTEM\ControlSet001\Services\Messenger\
Start = 4

HKLM\SYSTEM\ControlSet001\Services\RemoteRegistry\
Start = 4

HKLM\SYSTEM\ControlSet001\Services\TlntSvr\
Start = 4

HKLM\SYSTEM\CurrentControlSet\Services\Messenger\
Start = 4

HKLM\SYSTEM\CurrentControlSet\Services\RemoteRegistry\
Start = 4

HKLM\SYSTEM\CurrentControlSet\Services\TlntSvr\
Start = 4