W32/Rbot-SR

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.

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

HKU\[code number]\Software\Microsoft\Windows\
CurrentVersion\Run\

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-SR is a Windows worm that spreads via network shares with weak passwords.

The worm also has a backdoor component that allows a malicious user remote access to an infected computer via IRC channels while running in the background as a service process.

When run W32/Rbot-SR moves itself to the Windows System folder to a random filename with an EXE extension and creates the following registry entries so as to run itself at user logon:

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
System CPL manager
<random file name>

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
System CPL manager
<random file name>

HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices
System CPL manager
<random file name>

The worm attempts to terminate processes related to anti-virus and security programs.

When instructed by a remote attacker, W32/Rbot-SR attempts to perform the following functions:

start or terminate services
shutdown the computer
log keystrokes
launch Distributed Denial of Service (DDoS) attacks
download files from the internet and run them
steal CD keys for computer games
capture screen information and webcam windows
steal system information

The worm takes advantage of the vulnerabilities exploited by LSASS(MS04-011) and RPC-DCOM(MS04-012).

W32/Rbot-SR also sets the following registry entries:

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
N

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1