When executed, the worm creates the following files:
It then deletes all .exe files from the following folders:
C:\Program Files\USB Disk Security
D:\Program Files\USB Disk Security
It then creates the following registry entry so that it runs every time Windows starts: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\"Shell" = "Explorer.exe C:\WINDOWS\csrss.exe"
It also creates the following registry entries so that it runs when certain files are opened:
It saves the above files to the following locations:
Next, the worm may also download a file from the following location: http://members.multimania.co.uk/yahoophoto/hst.iq
It then replaces the hosts file with the above file.
The worm spreads by sending messages to contacts from the Microsoft Outlook Address Book (outlook.pst) and the Yahoo! Messenger instant messaging program. The messages have the following characteristics: From: One of the following:
[YAHOO ACCOUNT NAME]@yahoo.com
Note: The worm retrieves [YAHOO ACCOUNT NAME] from the Yahoo! Messenger graphical user interface using the getText API.
Subject: One of the following:
Here you have
Just for you
Message Body: One of the following:
Hello! This is The Document I told you about,you can find it Here. [http://]www.sharedocuments.com/library/PDF_Document21[REMOVED] Please check it and reply as soon as possible. Enjoy Your Time. Cheers,
This is The Free Dowload Sex Movies,you can find it Here. [http://]www.sharemovies.com/library/SEX21.025[REMOVED]
The worm also attempts to copy itself to Workgroup computers as the following files:
[COMPUTER NAME WITHIN WORKGROUP]\C\N73.Image12.03.2009.JPG.scr
[COMPUTER NAME WITHIN WORKGROUP]\D\N73.Image12.03.2009.JPG.scr
[COMPUTER NAME WITHIN WORKGROUP]\E\N73.Image12.03.2009.JPG.scr
[COMPUTER NAME WITHIN WORKGROUP]\F\N73.Image12.03.2009.JPG.scr
[COMPUTER NAME WITHIN WORKGROUP]\G\N73.Image12.03.2009.JPG.scr
[COMPUTER NAME WITHIN WORKGROUP]\H\N73.Image12.03.2009.JPG.scr
[COMPUTER NAME WITHIN WORKGROUP]\New Folder\N73.Image12.03.2009.JPG.scr
[COMPUTER NAME WITHIN WORKGROUP]\music\N73.Image12.03.2009.JPG.scr
[COMPUTER NAME WITHIN WORKGROUP]\print\N73.Image12.03.2009.JPG.scr
It attempts to copy itself to removable and mapped drives as the following file: %DriveLetter%\open.exe
It also copies the following file so that it runs when the above drives are accessed: %DriveLetter%\autorun.inf
The worm also creates the following network share: Name: updates Shared Path: %Windir%\system Comment: Public share for update.
Symantec Security Response encourages all users and administrators to adhere to the following basic security "best practices":
Use a firewall to block all incoming connections from the Internet to services that should not be publicly available. By default, you should deny all incoming connections and only allow services you explicitly want to offer to the outside world.
Enforce a password policy. Complex passwords make it difficult to crack password files on compromised computers. This helps to prevent or limit damage when a computer is compromised.
Ensure that programs and users of the computer use the lowest level of privileges necessary to complete a task. When prompted for a root or UAC password, ensure that the program asking for administration-level access is a legitimate application.
Disable AutoPlay to prevent the automatic launching of executable files on network and removable drives, and disconnect the drives when not required. If write access is not required, enable read-only mode if the option is available.
Turn off file sharing if not needed. If file sharing is required, use ACLs and password protection to limit access. Disable anonymous access to shared folders. Grant access only to user accounts with strong passwords to folders that must be shared.
Turn off and remove unnecessary services. By default, many operating systems install auxiliary services that are not critical. These services are avenues of attack. If they are removed, threats have less avenues of attack.
If a threat exploits one or more network services, disable, or block access to, those services until a patch is applied.
Always keep your patch levels up-to-date, especially on computers that host public services and are accessible through the firewall, such as HTTP, FTP, mail, and DNS services.
Configure your email server to block or remove email that contains file attachments that are commonly used to spread threats, such as .vbs, .bat, .exe, .pif and .scr files.
Isolate compromised computers quickly to prevent threats from spreading further. Perform a forensic analysis and restore the computers using trusted media.
Train employees not to open attachments unless they are expecting them. Also, do not execute software that is downloaded from the Internet unless it has been scanned for viruses. Simply visiting a compromised Web site can cause infection if certain browser vulnerabilities are not patched.
If Bluetooth is not required for mobile devices, it should be turned off. If you require its use, ensure that the device's visibility is set to "Hidden" so that it cannot be scanned by other Bluetooth devices. If device pairing must be used, ensure that all devices are set to "Unauthorized", requiring authorization for each connection request. Do not accept applications that are unsigned or sent from unknown sources.