Email-Worm:W32/MyDoom.V

Classification

Malware

Email-Worm

W32

MyDoom.V

Summary

Another new variant of MyDoom worm - Mydoom.V, was found on September 9th, 2004. This worm variant is very similar to previous variant: Mydoom.U. It spreads in emails with different subject and body texts, downloads and activates a backdoor.

Removal

Automatic action

Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.

Suspect a file is incorrectly detected (a False Positive)?

A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:

  • Check for the latest database updates

    First check if your F-Secure security program is using the latest detection database updates, then try scanning the file again.

  • Submit a sample

    After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.

    NOTE If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.

  • Exclude a file from further scanning

    If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.

    Note You need administrative rights to change the settings.

Find out more

Knowledge Base

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User Guide

See the user guide for your product on the Help Center.

Contact Support

Chat with or call an expert for help.

Submit a sample

Submit a file or URL for further analysis.

Technical Details

The worm is a PE executable file 18200 bytes long packed with UPX file compressor. The unpacked file's size is over 44 kilobytes.

Installation to system

When run, the worm creates a mutex 'WWWdefacedWWW', copies itself as WINDRV32.EXE to Windows System Directory and creates a startup key for that file in System Registry:

  • [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] "WinSPF" = "%WinSysDir%\windrv32.exe"

where %WinSysDir% represents Windows System directory.

Additionally the worm copies itself to the 'Start Menu\Programs\Startup\' folder of a current user as AUTOSTART.EXE file.

Spreading in emails

The worm spreads by sending its infected attachment to all email addresses found on an infected computer. The worm looks for email addresses in Windows Address Book and in the files with the following extensions:

  • wab
  • xls
  • vbs
  • uin
  • txt
  • tbb
  • stm
  • sht
  • php
  • msg
  • mht
  • jsp
  • htm
  • eml
  • dht
  • dbx
  • cgi
  • cfg
  • asp

The worm avoids sending emails to email addresses that contain any of the following substrings:

  • avp.
  • syman
  • icrosof
  • panda
  • sopho
  • borlan
  • inpris
  • example
  • mydomai
  • nodomai
  • ruslis
  • icrosoft
  • .gov
  • gov.
  • .mil
  • @foo.
  • @iana
  • spam
  • unix
  • linux
  • kasp
  • antivi
  • messagelabs
  • support
  • berkeley
  • unix
  • math
  • mit.e
  • gnu
  • fsf.
  • ibm.com
  • google
  • kernel
  • linux
  • fido
  • usenet
  • iana
  • ietf
  • rfc-ed
  • sendmail
  • arin.
  • ripe.
  • isi.e
  • isc.o
  • secur
  • acketst
  • pgp
  • tanford.e
  • utgers.ed
  • mozilla
  • icq.com
  • admin
  • icrosoft
  • support
  • ntivi
  • unix
  • bsd
  • linux
  • listserv
  • certific
  • google
  • accoun
  • abuse
  • upport
  • www
  • root
  • info
  • samples
  • postmaster
  • rating
  • root
  • news
  • webmaster
  • noone
  • noreply
  • nobody
  • nothing
  • anyone
  • someone
  • rating
  • site
  • contact
  • support
  • somebody
  • privacy
  • service
  • help
  • submit
  • feste
  • gold-certs

The subject of infected emails is selected from the following variants:

  • hello
  • here
  • hi
  • Hi!
  • important
  • Information
  • my
  • News
  • Notice again
  • Private document
  • Re: Hello
  • Re: Hi
  • Re: Message
  • Re: Proof of concept
  • Re: Question
  • Re: Status
  • Re: Your document
  • read it immediately
  • Thank you!
  • thanks!
  • You win!

The body of infected emails is selected from the following variants:

  • Can you confirm it?
  • For further details see the attachment....
  • For more details see the attachment.
  • Monthly news report.
  • Please answer quickly!
  • Please confirm!
  • Please read the attached file!
  • Please read the document.
  • Please see the attached file for detail...
  • Thanks!
  • Waiting for a Response. Please read the...
  • Your archive is attached.
  • Your requested mail has been attached.
  • I have attached document.
  • Please confirm the document.
  • Please read the attached file.
  • Please read the important document.
  • See attached file for details.
  • See the file.
  • lol!
  • fun!
  • fun game!
  • game
  • apply patch.
  • apply this patch!
  • You are infected by virus. Run this exe...
  • Virus removal tool
  • Thanks!
  • relax
  • See the file.
  • New game
  • fun photos
  • screensaverlol!

The worm can send itself as an executable attachment or in a ZIP archive with one of the following names:

  • document.doc .pif
  • doc.doc .pif
  • mesg.doc .pif
  • report.doc .pif
  • review.doc .pif
  • bill.doc .pif
  • doc.rtf .pif
  • mesg.rtf .pif
  • report.rtf .pif
  • review.rtf .pif
  • bill.rtf .pif
  • doc.txt .pif
  • mesg.txt .pif
  • report.txt .pif
  • review.txt .pif
  • bill.txt .pif
  • rep.txt .pif
  • Message.html .pif
  • document.zip
  • doc.zip
  • report.zip
  • new.zip
  • doc.zip
  • bill.zip
  • data.zip
  • details.zip
  • file.zip
  • info.zip
  • information.zip
  • letter.zip
  • message,.zip
  • file.exe
  • game.exe
  • photo.exe
  • pic.exe
  • new.exe
  • patch.exe
  • antivirus.exe
  • fun.scr
  • lol.scr

Also the worm can attach a fake virus scan report to its message:

  • +++ Attachment: No Virus found +++

where can be any of the following:

  • Norton AntiVirus - www.symantec.de
  • F-Secure AntiVirus - www.f-secure.com
  • Norman AntiVirus - www.norman.com
  • Panda AntiVirus - www.pandasoftware.com
  • Kaspersky AntiVirus - www.kaspersky.com
  • MC-Afee AntiVirus - www.mcafee.com
  • Bitdefender AntiVirus - www.bitdefender.com
  • MessageLabs AntiVirus - www.messagelabs.com

The worm fakes the sender's address. It uses the following list of first names to compose the fake address:

  • James
  • John
  • Robert
  • Michael
  • William
  • David
  • Richard
  • Charles
  • Joseph
  • Thomas
  • Christopher
  • Daniel
  • Paul
  • Mark
  • Donald
  • George
  • Kenneth
  • Steven
  • Edward
  • Brian
  • Ronald
  • Anthony
  • Kevin
  • Jason
  • Matthew
  • Gary
  • Timothy
  • Jose
  • Larry
  • Jeffrey
  • Frank
  • Scott
  • Eric
  • Stephen
  • Andrew
  • Raymond
  • Gregory
  • Joshua
  • Jerry
  • Dennis
  • Walter
  • Patrick
  • Peter
  • Harold
  • Douglas
  • Henry
  • Carl
  • Ricky
  • Troy
  • Randall
  • Barry
  • Alexander
  • Bernard
  • Mario
  • Leroy
  • Francisco
  • Marcus
  • Micheal
  • Theodore
  • Clifford
  • Miguel
  • Oscar
  • Jay
  • Jim
  • Tom
  • Calvin
  • Alex
  • Jon
  • Ronnie
  • Bill
  • Lloyd
  • Tommy
  • Leon

It uses the following list of last names to compose the fake address:

  • Smith
  • Johnson
  • Williams
  • Jones
  • Brown
  • Davis
  • Miller
  • Wilson
  • Moore
  • Taylor
  • Anderson
  • Thomas
  • Jackson
  • White
  • Harris
  • Martin
  • Thompson
  • Garcia
  • Martinez
  • Robinson
  • Clark
  • Rodriguez
  • Lewis
  • Lee
  • Walker
  • Hall
  • Allen
  • Young
  • Hernandez
  • King
  • Wright
  • Lopez
  • Hill
  • Scott
  • Green
  • Adams
  • Baker
  • Gonzalez
  • Nelson
  • Carter
  • Mitchell
  • Perez
  • Roberts
  • Turner
  • Phillips
  • Campbell
  • Parker
  • Cruz
  • Marshall
  • Ortiz
  • Gomez
  • Murray
  • Freeman
  • Wells
  • Webb
  • Simpson
  • Stevens
  • Tucker
  • Porter

It uses the following list of domain names to compose the fake address:

  • @dailymail.co.uk
  • @mail.com
  • @aol.com
  • @hotmail.com
  • @gmx.net
  • @t-online.de
  • @yahoo.co.uk
  • @msn.com
  • yahoo.com
  • cox.net

Downloading a backdoor

The worm downloads a backdoor from one of websites and activates it. The backdoor is known as 'Surila.I' or 'BackDoor-CEB.c' and is downloaded from the following websites:

  • www.planetboredom.net
  • vugs.geog.uu.nl
  • www.ach.ch
  • www.hiw.kuleuven.ac.be
  • www.surrenderzeeland.nl
  • www.llc.unibo.it

Limited lifecycle

After September 20th, 2004, 01:18:31 the worm stops working and deletes its file from a hard drive.