W32/Rbot-NK

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.

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.
• Check your administrator passwords and review network security.

W32/Rbot-NK 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-NK may be triggered to spread to network shares and via various exploits including RPC-DCOM, LASSS and various backdoors opened by otherTrojans. W32/Rbot-NK's backdoor functionality may allow a remote intruder to:

- Access webcam
- Capture screeenshot
- Steal CD keys related to various software
- Capture Windows login information on Windows NT/2000
- Access files on Host computer
- Send Email messages to other hosts
- Download/Upload/Execute files on host
- Run Keylogger
- Sniff network traffic and carry out DDOS on target

W32/Rbot-NK copies itself to the Windows system folder as realplay.exe and creates entries in the registry at the following locations to run itself on system startup:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Realplayer One: "realplay.exe"

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Realplayer One: "realplay.exe"

When triggered, W32/Rbot-NK tries to set the following registry entry to disable DCOM:

HKLM\Software\Microsoft\OLE\EnableDCOM = "N"

W32/Rbot-NK tries to set the following registry entry to restrict access to the IPC$ share on the infected computer:

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