W32/Rbot-AGX

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 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-AGX is a worm and IRC backdoor Trojan for the Windows platform.

W32/Rbot-AGX spreads to other network computers by exploiting the WKS (MS03-049) buffer overflow vulnerability.

W32/Rbot-AGX runs continuously in the background, providing a backdoor server which allows a remote intruder to gain access and control over the computer via IRC channels.

W32/Rbot-AGX includes functionality to:

- steal confidential information
- log key strokes to the file <System>\keys.txt
- silently download, install and run new software

When first run W32/Rbot-AGX copies itself to <System>\lexplore.exe.

The following registry entries are created to run lexplore.exe on startup:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Configuration Loader
lexplore.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Configuration Loader
lexplore.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices
Configuration Loader
lexplore.exe

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Configuration Loader
lexplore.exe

Registry entries are set as follows:

HKCU\SYSTEM\CurrentControlSet\Control\Lsa
Configuration Loader
lexplore.exe

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
Configuration Loader
lexplore.exe

HKCU\Software\Microsoft\OLE
Configuration Loader
lexplore.exe

HKLM\SOFTWARE\Microsoft\Ole
Configuration Loader
lexplore.exe

W32/Rbot-AGX may also create the file "msdirectx.sys" which is detected by Sophos as Troj/NtRootK-F.

The following patch for the operating system vulnerability exploited by W32/Rbot-AGX can be obtained from the Microsoft website:

MS03-049