W32/Rbot-BIT

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.

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.

W32/Rbot-BIT is a worm and IRC backdoor Trojan for the Windows platform.

W32/Rbot-BIT spreads to other network computers by exploiting common buffer
overflow vulnerabilities, including IIS5SSL (MS04-011) (CAN-2003-0719).

W32/Rbot-BIT 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.

When first run W32/Rbot-BIT copies itself to <System>\<random filename>

The following registry entries are created to run <random filename> on startup:

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Win Prosess0r
<random filename>

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
Win Prosess0r
<random filename>

Registry entries are set as follows:

HKCU\Software\Microsoft\OLE
Win Prosess0r
<random filename>

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1