Threat behavior
Win32/Lumebag is a worm that spreads via Peer-to-Peer file sharing networks, and downloads and executes arbitrary files, including additional malicious executables. It is a component of the greater multi-component Win32/Bagle family.
Installation
When executed, Win32/Lumebag copies itself to %appdata%\m\flec006.exe and modifies the registry to ensure that this file is executed at each Windows start:
Adds value: "mule_st_key"
With data: "%app data%\m\flec006.exe"
To subkey: HKCU\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
Spreads Via...
Peer-to-Peer File Sharing
Win32/Lumebag downloads a list of filenames to use when attempting to spread via P2P file sharing from one or more of the following domains:
80.74.135.131
erlebnispaedagogik-chemnitz.de
innovainteriorismo.com
insidedg.com.ar
insumy.iatp.org.ua
inter-ex.cz
intercambio4.com
ip-kamery.com
irannano.org
inforserver.com
infoserwis2.home.pl
ingenieria-inversa.cl
The worm creates ZIP archives containing copies of itself in the %app data%\m directory using filenames provided by the remote sites. The ZIP files are designed to masquerade as cracks for popular programs.
The worm connects to the eDonkey peer-to-peer network and hosts these ZIP archives in order to encourage unsuspecting users to download copies of the worm.
Payload
Downloads and Executes Arbitrary Files
Win32/Lumebag may also download additional executable components from the afore-mentioned list of domains. Downloaded components are saved to the %app data%\m directory.
Analysis by Matt McCormack
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.
To turn on the Windows Firewall in Windows Vista
Click Start, and click Control Panel.
Click Security.
Click Turn Windows Firewall on or off.
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 automatically download future Microsoft security updates 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/protect/computer/viruses/vista.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.
