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Somali.A


Discovered:
Aliases:


August 28, 2006
Somali.A

Malware
Worm
W32

Summary

Somali.A is a mass-mailing worm that terminates security-related processes and blocks antivirus-related software updates. This malware will only run on Windows platforms that have .NET framework installed.



Disinfection & Removal

Automatic Disinfection

Allow F-Secure Anti-Virus to disinfect the relevant files.

For more general information on disinfection, please see Removal Instructions.



Technical Details

Upon execution, Somali.A creates the following auto-run registry key so that every time the user logs on, Somali.A will be executed:

  • [HKCU\Software\Microsoft\Windows\Currentversion\Run] Services32.bak = %windi%\system32\ctfmon32.exe

It then drops several copies of itself:

  • %windir%\system32\ctfmon32.exe
  • %rootdir%\project.pif
  • %currentdir%\Project-setup.exe

For its signature, it creates the following registry key:

  • [HKCU\MadSoli] MadSoli = "System"

It creates a Mutex named MadSoli so that there will be only one instance of itself in the memory.

It displays the following fake error messages:

Note: This message will appear on the first run on a clean machine.

Note: This message will appear if it has been run previously.

Somali.A checks the running processes and terminates processes with the following strings:

  • AVGSERV
  • AVGSERV9
  • Clshield
  • DAP
  • GhostTray
  • mghtml
  • NAVW32
  • notepad
  • NTPROTECTED
  • regedit
  • scan32
  • SCAN95
  • taskmgr

Somali.A can also propagate through network. It does this by creating the Shared folder:

  • %rootdir%\System33

- and drops a copy of itself on the said shared folder as Sound.exe.

The said shared folder has a share name of MadSoli, please see the sample image below:

Subsequently, it will create the following registry key:

  • [HKLM\System\CurrentControlSet\Services\lanmanserver\Shares] MadSoli = {Multi-String} - See Screenshot:

Somali.A creates a HOST file named HOST.file in the %windir%\system32\drivers\etc directory.

This HOST file will not allow accesses to the following sites:

  • avg.com
  • download.mcafee.com
  • google.com
  • google.com
  • mcafee.com
  • pandasoftware.com
  • symantec.com
  • trendmicro.com
  • update.symantec.com
  • www.24-7-transportation.com
  • www.adhdtests.com
  • www.aegee.org
  • www.aimcenter.net
  • www.alupass.lu
  • www.amanit.ru
  • www.AmirCivil.com
  • www.andara.com
  • www.angelartsanctuary.com
  • www.anthonyflanagan.com
  • www.approved1stmortgage.com
  • www.argontech.net
  • www.asianfestival.nl
  • www.atlantisteste.hpg.com.br
  • www.avg.com
  • www.avg.com
  • www.aviation-center.de
  • www.bbc.com
  • www.bbsh.org
  • www.bga-gsm.ru
  • www.boneheadmusic.com
  • www.bottombouncer.com
  • www.bradster.com
  • www.buddyboymusic.com
  • www.bueroservice-it.de
  • www.calderwoodinn.com
  • www.capri-frames.de
  • www.celula.com.mx
  • www.ceskyhosting.cz
  • www.chinasenfa.com
  • www.cntv.info
  • www.compsolutionstore.com
  • www.coolfreepages.com
  • www.corpsite.com
  • www.couponcapital.net
  • www.cpc.adv.br
  • www.crystalrose.ca
  • www.cscliberec.cz
  • www.curtmarsh.com
  • www.customloyal.com
  • www.DarrkSydebaby.com
  • www.deadrobot.com
  • www.dontbeaweekendparent.com
  • www.download.mcafee.com
  • www.dragcar.com
  • www.ecofotos.com.br
  • www.eurostavba.sk
  • www.everett.wednet.edu
  • www.fcpages.com
  • www.featech.com
  • www.FritoPie.NET
  • www.google.com
  • www.mcafee.com
  • www.microsoft.com
  • www.my-etrust.com
  • www.pandasoftware.com
  • www.symantec.com
  • www.trendmicro.com
  • www.update.symantec.com
  • www.viruslist.com
  • www.yahoo.com
  • yahoo.com

Somali.A attempts to mass-mail itself using mx4.mail.yahoo.com as its SMTP server.

It searches for Yahoo! e-mail addresses on Windows folder in the files with the following extension names:

  • adb
  • asp
  • cfg
  • cgi
  • dbx
  • eml
  • html
  • pl
  • shtm
  • txt
  • wab
  • xml

Possible Email address of the Sender:

  • antiblaster@yahoo.com
  • avg@yahoo.com
  • bill@yahoo.com
  • bob@yahoo.com
  • ebook@yahoo.com
  • info@yahoo.com
  • iraq@yahoo.com
  • LongShot@yahoo.com
  • matt@yahoo.com
  • mcafee@yahoo.com
  • nod32@yahoo.com
  • panda@yahoo.com
  • smith@yahoo.com
  • stan@yahoo.com
  • steve@yahoo.com
  • symantec@yahoo.com
  • update@yahoo.com
  • YourFriend@yahoo.com
  • CC: software@yahoo.com
  • BCC: crack@yahoo.com

Possible Subjects:

  • Announcement
  • ANTI VIRUS
  • Attention
  • E-mail account disabling warning
  • FBI
  • IranSare2008
  • mcafee
  • NOD32
  • password
  • Read it immediately
  • Soccer funs in public place
  • symantec
  • Text Message
  • Text message
  • Yahoo!
  • Your IP was logged

Possible Message Body:

  • Your e-mail account was used to send a huge amount of unsolicited spam messages during the recent week. If you could please take 5-10 minutes out of your online experiences and confirm the attach document so you will not run into any future problems with the online service.
  • It has come to our attention that your (File!) User Profile ( x )records are out of date. For further details see the attached document. Tank you for using !
  • Thank you for using file
  • +++ Attachment: No Virus (Clean)
  • +++[mcafee] Antivirus - www.mcafee.com
  • Deliver Error
  • Message Error
  • help attached
  • such as yours
  • illegal st. of you
  • I have your password!
  • classroom test of you?
  • old photos about you?

Backdoor

Somali.A opens TCP port 8051. If a remote hacker connects to the said port and sends strings through this port, Somali.A will reply with the same string with all capital letters and adds exclamation mark at the end of the string.


Payloads

Somali.A creates the following user in the local User Group:

User name: NewAdmin
Password: MadSoli
Comment: Windows pc

Note: Run the following command from the CMD prompt to check for the said user: "net user NewAdmin".

It deletes all the subkeys on the following registry key:

  • [HKCU\Printers]

- and displays the following Message Box every 19th of the month:



Detection

F-Secure Anti-Virus detects this malware with the following updates:

Detection Type: PC
Database: 2006-08-28_04





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