W32/Rbot-SV

Please follow the instructions for removing worms.

Check your administrator passwords and review network security.

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.

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-SV is a worm which attempts to spread to remote network shares. It also contains backdoor functionality, allowing unauthorised remote access to the infected computer via IRC channels while running in the background as a service process.

W32/Rbot-SV spreads to network shares with weak passwords and via network security exploits as a result of the backdoor element receiving the appropriate command from a remote user.

W32/Rbot-SV copies itself to the Windows system folder as mssams.EXE and creates entries at the following locations in the registry so as to run itself on system startup, trying to reset them every minute:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Security Agent Manager
mssams.EXE

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Security Agent Manager
mssams.EXE

HKCU\Software\Microsoft\Windows\CurrentVersion\Run\
Security Agent Manager
mssams.EXE

HKCU\Software\Microsoft\Windows\CurrentVersion\RunServices\
Security Agent Manager
mssams.EXE

W32/Rbot-SV sets the following registry entries, trying to reset them every 2 minutes.

HKLM\SOFTWARE\Microsoft\Ole\
EnableDCOM
"N"

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

W32/Rbot-SV may try to delete the C$, D$, E$, IPC$ and ADMIN$ network shares.

W32/Rbot-SV attempts to terminate certain processes related to anti-virus and security programs including SWEEP.EXE, REGEDIT.EXE, MSCONFIG.EXE and NETSTAT.EXE.