W32/Rbot-ABU

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.

Close the registry editor.

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-ABU is an internet worm and backdoor Trojan.

W32/Rbot-ABU spreads to other network computers by exploiting LSASS (MS04-011), RPC-DCOM (MS04-012), WKS (MS03-049) and MSSQL (MS02-039) buffer overflow vulnerabilities and by copying itself to network shares protected by weak passwords.

W32/Rbot-ABU 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.

The worm also includes functionality to:

- steal confidential information
- carry out DDoS flooder attacks
- silently download, install and run new software
- disable other applications
- execute arbitrary commands

When first run W32/Rbot-ABU moves itself to the Windows system folder as mouseutils.exe.

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

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Windows Mouse Utilities
mouseutils.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
Windows Mouse Utilities
mouseutils.exe

W32/Rbot-ABU creates the following registry entry:

HKCU\Software\Microsoft\OLE
Windows Mouse Utilities
mouseutils.exe

Registry entries are also set as follows:

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1

The following patches for the operating system vulnerabilities exploited by W32/Rbot-ABU can be obtained from the Microsoft website:

MS04-011
MS04-012
MS03-049
MS02-039