W32.Serflog.C

1. Closes Windows that contain the following strings in their titles:
   
   
   • ADWARE
   • ALERTS
   • ANTI
   • AUTOSTARTED
   • Avg
   • BENIGN
   • BLOCKER
   • BUG
   • BULLGUARD
   • BUSTER
   • CENTER
   • -CILLIN
   • CLEANER
   • CMD
   • Command
   • DESTROY
   • DETECTION
   • DOCTOR
   • EARTHLINK
   • EDITOR
   • ELIMINATE
   • EYE
   • FIGHT
   • Filter
   • FIREWALL
   • FIX
   • FIXING
   • HEAL
   • HELP
   • HUNTER
   • KERIO
   • Kill
   • LABS
   • LIVEUPDATE
   • MALWARE
   • MALWHERE
   • MCAFEE
   • NETCOP
   • NOD32
   • NORTON
   • PANDA
   • PROMPT
   • PROTECTOR
   • REGISTRY
   • REMOVAL
   • RESTORE
   • SANDBOX
   • SCAN
   • SECURE
   • SECURITY
   • SOPHOS
   • SPY
   • SPYBOT
   • SPYWARE
   • STOPPER
   • SWEEPER
   • TASK
   • TOOL
   • TREND
   • Update
   • VCATCH
   • VIRUS
   • WATCH
   • WORM
     
     Which may result in the following functions being disabled:
     
     
   • Registry editing programs
   • Command line
   • Process monitoring programs
   • Task manager
     
     
2. Creates the following mutex so that only one instance of the worm is run on the compromised computer:
   
   '-S-K-Y-'-D-E-V-I-L-'
   
   
3. It sets its file attributes to archive, system, and hidden.
   
   
4. Copies itself as the following:
   
   
   • %System%\csnss.exe
   • %System%\mcsv.com
   • %Windows%\svhost.exe
     
     Notes:
   • %System% is a variable that refers to the System folder. By default this is C:\Windows\System (Windows 95/98/Me), C:\Winnt\System32 (Windows NT/2000), or C:\Windows\System32 (Windows XP).
   • The file attributes are set to archive, system, and hidden.
     
     
5. Creates the following copies of itself:
   
   
   • %SystemDrive%\Death of crazy frog!.pif
   • %SystemDrive%\Hot babe!.pif
   • %SystemDrive%\Really Cute.pif
   • %SystemDrive%\My piccy.pif
   • %SystemDrive%\Bungee-Fuck.pif
   • %SystemDrive%\I_love_you.123greetings.com.com
   • %SystemDrive%\Paris Hilton Sex Tape.pif
   • %SystemDrive%\Shoot Bill Gates!.exe
   • %SystemDrive%\Best_Friend.scr
   • %SystemDrive%\lol Busted Are Gay!.pif
   • %SystemDrive%\Saddam Song!.pif
   • %SystemDrive%\Me at the Beach!.pif
   • %SystemDrive%\l0ser.HTML
     
     Notes: %SystemDrive% is a variable that refers to the drive on which Windows is installed. By default, this is drive C.
     
     
6. Adds the value:
   
   "[Value Name]" = "[File name]"
   
   to the registry subkeys:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   
   so that the worm is executed every time Windows starts.
   
   Where [Value Name] is one of the following:
   
   
   • NDAv
   • SDAv
     
     and where [File name] is one of the following:
     
     
   • %System%\csnss.exe
   • %Window%\svhost.exe
     
     
7. Adds the value:
   
   "Userinit" = "%System%\userinit.exe %System%\mcsv.com"
   
   to the registry key:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
   
   
8. Adds the registry values:
   
   "DisableConfig" = "1"
   "DisableSR" = "1"
   
   to the registry subkey:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows NT\SystemRestore
   
   to disable system restore.
   
   
9. Adds the value:
   
   "NoFolderOptions" = "1"
   
   to the registry subkey:
   
   HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer
   
   
10. Adds the value:
    
    "Hidden" = "2"
    
    to the registry subkey:
    
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer\Advanced
    
    
11. Adds the value:
    
    "NoWindowsUpdate" = "1"
    
    to the registry subkey:
    
    HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Windows\CurrentVersion\Policies\Explorer
    
    
12. Adds the value:
    
    "AvEnbl"= "0"
    
    to the registry subkey:
    
    HKEY_CURRENT_USER\SOFTWARE\Microsoft\MSNMessenger
    
    
13. Deletes the following registry subkeys:
    
    HKEY_LOCAL_MACHINE\Software\Symantec
    HKEY_LOCAL_MACHINE\Software\McAfee
    HKEY_LOCAL_MACHINE\Software\KasperskyLab
    HKEY_LOCAL_MACHINE\Software\Agnitum
    HKEY_LOCAL_MACHINE\Software\Panda Software
    HKEY_LOCAL_MACHINE\Software\Zone Labs
    
    
14. Deletes the values from the following registry subkeys:
    
    HKEY_CURRENT_USER\Software\Microsoft\MSNMessenger\"AntiVirus"
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"MS_LARISSA"
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"SpoolSV Manager"
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"MSLARISSA"
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"Command Prompt32"
    HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\"(L4r1$$4) (4nt1) (V1ruz)"
    
    
15. Retrieves a file name from the following registry subkey and deletes the file:
    
    HKEY_CURRENT_USER\Software\Microsoft\MSNMessenger\"AntiVirus"
    
    
16. Creates the file %SystemDrive%\10ser.Html, whose attributes are set to archive, hidden, and system. Then the worm opens this html file to display a .jpg file from [domain removed]bill_gates.jpg.
    
    
17. Displays a counter that shows how many computers have been compromised by the worm. The counter is referenced to the following Web site:
    
    [domain removed] /index.php?u=ffffggggg&s=ainv
    
    
18. Creates a file %Windows%\LARISSA you muppet.txt, which is a nonmalicious text file. The worm displays this text file if the current system day is 2, 10, 12, 19, 26, 29, or 31.
    
    Note: The file attributes are set to archive, system, and hidden.
    
    
19. Sends a copy of itself to all the contacts in MSN Messenger using one of the following file names:
    
    
    • Crazy frog gets killed by train!.pif
    • Annoying crazy frog getting killed.pif
    • See my lesbian friends.pif
    • My new photo!.pif
    • Me on holiday!.pif
    • The Cat And The Fan piccy.pif
    • How a Blonde Eats a Banana...pif
    • Mona Lisa Wants Her Smile Back.pif
    • Topless in Mini Skirt! lol.pif
    • Fat Elvis! lol.pif
    • Jennifer Lopez.scr
      
      
20. Copies itself to the following folders, which are used by various file-sharing applications:
    
    
    • %SystemDrive%\My Shared Folder
    • %SystemDrive%\Documents and Settings
    • %SystemDrive%\ProgramFiles\eMule\Incoming
    • %UserProfile%\Shared
      
      Note: %UserProfile% is a variable that refers to the current user's profile folder. By default, this is C:\Documents and Settings\<Current User> (Windows NT/2000/XP).
      
      The worm copies itself to the above folders using the following file names:
      
    • MSN Messenger 7 patch!.exe
    • CE/DP Stealer 2.exe
    • MSN Avatar Display Pack 1.0.exe
      
      Note: The file attributes are set to archive, system, and hidden.
      
      
21. Terminates processes. A full list of processes deleted by the threat is given in the additional information section below.
    
    
22. Adds the following text to the Hosts file to block access to various Web sites, some of which may be security-related:
    
    212.58.240.33 www.symantec.com
    212.58.240.33 www.sophos.com
    212.58.240.33 www.mcafee.com
    212.58.240.33 www.viruslist.com
    212.58.240.33 www.f-secure.com
    212.58.240.33 www.avp.com
    212.58.240.33 www.kaspersky.com
    212.58.240.33 www.networkassociates.com
    212.58.240.33 www.ca.com
    212.58.240.33 www.my-etrust.com
    212.58.240.33 www.nai.com
    212.58.240.33 www.trendmicro.com
    212.58.240.33 www.grisoft.com
    212.58.240.33 securityresponse.symantec.com
    212.58.240.33 symantec.com
    212.58.240.33 sophos.com
    212.58.240.33 mcafee.com
    212.58.240.33 liveupdate.symantecliveupdate.com
    212.58.240.33 viruslist.com
    212.58.240.33 f-secure.com
    212.58.240.33 kaspersky.com
    212.58.240.33 kaspersky-labs.com
    212.58.240.33 avp.com
    212.58.240.33 networkassociates.com
    212.58.240.33 ca.com
    212.58.240.33 mast.mcafee.com
    212.58.240.33 my-etrust.com
    212.58.240.33 download.mcafee.com
    212.58.240.33 dispatch.mcafee.com
    212.58.240.33 secure.nai.com
    212.58.240.33 nai.com
    212.58.240.33 update.symantec.com
    212.58.240.33 updates.symantec.com
    212.58.240.33 us.mcafee.com
    212.58.240.33 liveupdate.symantec.com
    212.58.240.33 customer.symantec.com
    212.58.240.33 rads.mcafee.com
    212.58.240.33 trendmicro.com
    212.58.240.33 grisoft.com
    212.58.240.33 sandbox.norman.no
    212.58.240.33 www.pandasoftware.com
    212.58.240.33 uk.trendmicro-europe.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.