Threat behavior
Win32/Sober.V@mm is a mass-mailing worm. The worm performs the following operations when it runs:
- Creates a copy of itself named services.exe in folder %windir%\connectionstatus\microsoft.
- Runs the worm copy %windir%\connectionstatus\microsoft\services.exe.
- Modifies the registry to cause the worm to run automatically each time Windows starts:
Creates value: WinCheck
with data: %windir%\connectionstatus\microsoft\services.exe
in registry key:
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Creates value: _WinCheck
with data: %windir%\connectionstatus\microsoft\services.exe
in registry key:
HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run - Creates the following empty files in <system folder>, the Windows system folder:
bbvmwxxf.hml
gdfjgthv.cvq
langeinf.lin
nonrunso.ber
rubezahl.rub
runstop.rst - Displays a pop-up window with the message: "No Viruses, Trojans or Spyware found!"
- Gathers e-mail addresses from files with certain extensions on the host computer, avoiding e-mail addresses that contain certain strings. The worm stores the collected addresses in a file named concon.www that it creates in folder %windir%\connectionstatus\microsoft.
- Sends a copy of itself as an e-mail attachment to the collected e-mail addresses.
Prevention
Take the following steps to help prevent infection on your system:
Enable a firewall on your computer.
Get the latest computer updates.
Use up-to-date antivirus software.
Use caution with attachments and file transfers.
Enable a firewall on your computer
Use a third-party firewall product or turn on the Microsoft Windows XP Internet Connection Firewall.
To turn on the Internet Connection Firewall in Windows XP
Click Start, and click Control Panel.
Click Network and Internet Connections. If you do not see Network and Internet Connections, click Switch to Category View.
Click Change Windows Firewall Settings.
Select On.
Click OK.
Get the latest computer updates
Updates help protect your computer from viruses, worms, and other threats as they are discovered. You can use the Automatic Updates feature in Windows XP to download future Microsoft security updates automatically while your computer is on and connected to the Internet.
To turn on Automatic Updates in Windows XP
Click Start, and click Control Panel.
Click System.
Click Automatic Updates.
Select a setting. Microsoft recommends selecting Automatic. If you do not choose Automatic, but you choose to be notified when updates are ready, a notification balloon appears when new downloads are available to install. Click the notification balloon to review and install the updates.
Use up-to-date antivirus software
Most antivirus software can detect and prevent infection by known malicious software. To help protect you from infection, you should always run antivirus software that is updated with the latest signature files. Antivirus software is available from several sources. For more information, see http://www.microsoft.com/athome/security/downloads/default.mspx
Use caution with attachments and file transfers
Exercise caution with e-mail and attachments received from unknown sources, or received unexpectedly from known sources. Use extreme caution when accepting file transfers from known or unknown sources.
