W32/Rbot-DY

Please follow the instructions for removing worms.

You will also need to edit the following registry entries, if 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\
Microsoft Update Machine = lmrss.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Microsoft Update Machine = lmrss.exe

and delete them if they exist.

Each user has a registry area named HKEY_USERS\[code number indicating user]\. For each user locate the entry:

HKCU\[code number]\Software\Microsoft\Windows\CurrentVersion\Run\
Microsoft Update Machine = lmrss.exe

and delete it if it exists.

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-DY is an IRC backdoor worm.

W32/Rbot-DY allows unauthorised remote access to the infected computer via an IRC channel. The worm may spread to network shares with weak passwords in response to a backdoor command.

W32/Rbot-DY copies itself to the Windows system folder as lmrss.exe and creates the following registry entries so as to run itself on system startup:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Microsoft Update Machine = lmrss.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Microsoft Update Machine = lmrss.exe
HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
Microsoft Update Machine = lmrss.exe

W32/Rbot-DY may set the following additional registry entries:

HKLM\SOFTWARE\Microsoft\Ole\EnableDCOM = "N"
HKLM\SYSTEM\ControlSet001\Control\Lsa\restrictanonymous = 1
HKLM\SYSTEM\CurrentControlSet\Control\Lsa\restrictanonymous = 1

W32/Rbot-DY may attempt to terminate certain processes relating to anti-virus and security programs. The worm may also delete network shares on the host computer.