W32/Rbot-ABG

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 entries:

HKU\[code number]\Software\Microsoft\Windows\
CurrentVersion\Run\

HKU\[code number]\Software\Microsoft\Windows\
CurrentVersion\RunServices\

and remove any reference to any file you deleted.

Close the registry editor.

W32/Rbot-ABG is a worm which attempts to spread to remote network shares. It also contains backdoor functionality, allowing unauthorised remote access to the infected computer via IRC channels while running in the background as a service process.

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

W32/Rbot-ABG copies itself to the Windows system folder as ctupdclt.exe and creates entries at the following locations in the registry so as to run itself on system startup, resetting the entries in every 2 minutes:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
CTUpdate
ctupdclt.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
CTUpdate
ctupdclt.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
CTUpdate
ctupdclt.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices\
CTUpdate
ctupdclt.exe

W32/Rbot-ABG tries to delete the I$ network shares on the host computer in
every 2 minutes.