W32/Rbot-GN

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 System32 Update = cmsrg.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Microsoft System32 Update = cmsrg.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]\Sofrware\Microsoft\OLE
Microsoft System32 Update = cmsrg.exe

and delete it if it exists.

Close the registry editor.

• Check your administrator passwords and review network security.
• Download and install the Microsoft patches mentioned. On standalone computers, update with all relevant security patches from Windows update.

W32/Rbot-GN is a network worm and backdoor Trojan for the Windows platform. W32/Rbot-GN allows a malicious user remote access to an infected computer.

The worm copies itself to cmsrg.exe in the Windows system folder and creates the following registry entries to run itself on startup:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run\
Microsoft System32 Update = cmsrg.exe
HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices\
Microsoft System32 Update = cmsrg.exe
HKCU\Sofrware\Microsoft\OLE
Microsoft System32 Update = cmsrg.exe

W32/Rbot-GN spreads using a variety of techniques including exploiting weak passwords on computers and SQL servers, exploiting operating system vulnerabilites (including DCOM-RPC, LSASS, WebDAV and UPNP) and using backdoors opened by other worms or Trojans.

W32/Rbot-GN can be controlled by a remote attacker over IRC channels. The infected computer can be used to perform any of the following functions:

• Proxy server (SOCKS4)
• FTP server
• HTTP server
• File system manipulation
• Port scanner
• DDoS floods (TCP,UDP,SYN)
• Remote shell (RLOGIN)
• Packet sniffer
• Key logger

Patches for the operating system vulnerabilities exploited by W32/Rbot-GM can be obtained from Microsoft at; MS04-011, MS03-026, MS03-007 and MS01-059.