W32.Looked.B

1. Adds the value:
   
   "auto" = "1"
   
   to the following registry entry:
   
   HKEY_LOCAL_MACHINE\Software\Soft\DownloadWWW
   
   
2. Disables the Zone Alarm firewall
   
   
3. Stops the following security-related processes:
   
   • Ravmon.exe
   • EGHOST.EXE
   • MAILMON.EXE
   • KAVPFW.EXE
   • IPARMOR.EXE
     
     
4. Injects the dropped .dll into Internet Explorer.
   
   
5. Downloads a password stealer from the domain www.twavgirl.com and saves it as %Windir%\1.exe.
   
   Note: %Windir% is a variable that refers to the Windows installation folder. By default, this is C:\Windows or C:\Winnt.
   
   
6. Searches for .exe files to infect in all the drives on the computer from the C drive onwards.
   
   The worm will not infect .exe files in folders with the following substrings in their name:
   
   • system
   • system32
   • windows
   • Documents and Settings
   • System Volume Information
   • Recycled
   • winnt
   • \Program Files
   • Windows NT
   • WindowsUpdate
   • Windows Media Player
   • Outlook Express
   • Internet Explorer
   • ComPlus Applications
   • NetMeeting
   • Common Files
   • Messenger
   • Microsoft Office
   • InstallShield Installation Information
   • MSN
   • Microsoft Frontpage
   • Movie Maker
   • MSN Gaming Zone
     
     
7. Prepends itself to any .exe files that it finds on the computer, except the following:
   
   • IEXPLORE.EXE
   • EXPLORER.EXE
     
     The size of an infected file is increased by 67,072 bytes. The icon of infected files is similar to the image used for .zip files.
     
     
8. Creates a copy of itself as %Windir%\Logo1_.exe.
   
   
9. Drops a file called virDll.dll in the current folder, when a file infected with W32.Looked.B is executed.
   
   
10. Copies itself to the following network shares that have blank guest and administrator passwords:
    
    • IPC$
    • ADMIN$
      
      
11. Sends ICMP traffic containing the string "Hello,World" to the following IP addresses:
    
    • 192.168.0.30
    • 192.168.8.1
      
      
12. Redirects Web sites by adding the following text to the hosts file:
    
    66.197.186.149 www.hinet.net
    66.197.186.149 www.pchome.com.tw
    66.197.186.149 www.msn.com.tw
    66.197.186.149 www.yam.com
    66.197.186.149 www.google.com.tw
    66.197.186.149 www.gamer.com.tw
    66.197.186.149 www.taiwankiss.com
    66.197.186.149 www.sina.com.tw
    66.197.186.149 www.so-net.net.tw
    66.197.186.149 www.uhome.net
    66.197.186.149 www.gamania.com
    66.197.186.149 www.104.com.tw
    66.197.186.149 www.tp.edu.tw
    66.197.186.149 www.seed.net.tw
    66.197.186.149 www.tw18.com
    66.197.186.149 www.gamebase.com.tw
    66.197.186.149 www.hello.com.tw
    66.197.186.149 www.taiwandns.com
    66.197.186.149 www.ithome.com.tw
    66.197.186.149 www.cartoonnetwork.com.tw
    66.197.186.149 bubble.com.tw
    66.197.186.149 tw.ebay.com
    66.197.186.149 www.microsoft.com
    66.197.186.149 www.oc-gamer.com
    66.197.186.149 www.igame.com.tw
    66.197.186.149 www.funtown.com.tw
    66.197.186.149 www.softstar.com.tw
    66.197.186.149 service.gamania.com
    66.197.186.149 www.gamezone.idv.tw
    66.197.186.149 www.ggame.com.tw
    66.197.186.149 www.gamestation.com.tw
    66.197.186.149 www.lineage2.com.tw
    66.197.186.149 tw.games.yahoo.com
    66.197.186.149 www.iogc.com.tw
    66.197.186.149 www.transakt.com.tw
    66.197.186.149 www.softking.com.tw
    66.197.186.149 groups.msn.com
    66.197.186.149 www.mofa.com.tw
    66.197.186.149 dir.pchome.com.tw
    66.197.186.149 www.sa.game.tw
    66.197.186.149 www.books.com.tw
    66.197.186.149 www.gamemaster.com
    66.197.186.149 www.newspace.com.tw
    66.197.186.149 www.e-box.net.tw
    66.197.186.149 gnn.gamer.com.tw
    66.197.186.149 pc.gamebase.com.tw
    66.197.186.149 twbbs.net.tw
    66.197.186.149 www.twindex.com.tw
    66.197.186.149 www.t2t.com.tw
    66.197.186.149 www.girl-tw.com
    66.197.186.149 www.sogi.com.tw
    66.197.186.149 hdvd.com.tw
    66.197.186.149 cgi.tw.ebay.com
    66.197.186.149 movie.kingnet.com.tw
    66.197.186.149 www.atmovies.com.tw
    66.197.186.149 www.movie.com.tw
    66.197.186.149 www.kokoro.com.tw
    66.197.186.149 www.twgirls.net
    66.197.186.149 bbs.vips.com.tw
    66.197.186.149 www.symantec.com
    66.197.186.149 www.symantec.com.tw
    66.197.186.149 liveupdate.symantecliveupdate.com

Recommendations

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.
• For further information on the terms used in this document, please refer to the Security Response glossary.