W32/Rbot-SI

Category: Viruses and Spyware
Type: Win32 worm
Prevalence: Small Number of Reports

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W32/Rbot-SI is an IRC backdoor Trojan and network worm.

W32/Rbot-SI may spread to remote network shares protected by weak passwords and computers vulnerable to common exploits. The worm also opens up a backdoor, allowing unauthorised remote access to infected computers via the IRC network, while running in the background as a service process.

W32/Rbot-SI can receive commands from a remote intruder which include instructions to delete network shares, log keypresses, participate in DDoS attacks, scan other computers for vulnerabilities, steal passwords, steal registration keys for computer games, create administrator accounts and start a proxy server.

W32/Rbot-SI copies itself to the Windows system folder and creates the following registry entries to run automatically on log-on:

HKLM\Software\Microsoft\Windows\CurrentVersion\Run
Windows Media Player
msa.exe

HKLM\Software\Microsoft\Windows\CurrentVersion\RunServices
Windows Media Player
msa.exe

HKCU\Software\Microsoft\Windows\CurrentVersion\Run
Windows Media Player
msa.exe

W32/Rbot-SI also attempts to alter the following registry entries if they were not already set:

HKLM\SOFTWARE\Microsoft\Ole
EnableDCOM
"N"

HKLM\SYSTEM\CurrentControlSet\Control\Lsa
restrictanonymous
1