Email-Worm:W32/MyDoom.X

The worm is a PE executable file 18432 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 'LLLf54fxrDLLL', copies itself as WIN32S.EXE to Windows System Directory and creates a startup key for that file in System Registry:

• [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] "Win32System" = "%WinSysDir%\win32s.exe"

where "%WinSysDir%" represents Windows System directory.

Additionally, the worm copies itself to the 'Start Menu\Programs\Startup\' folder of a current user as AUTORUN.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 (WAB) and in the files with the following extensions:

• wab
• xls
• uin
• txt
• tbb
• stm
• sht
• php
• msg
• mht
• mbx
• 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:

• FW: remember me?..
• FW: hi
• FW: hello sweety :>
• FW: my photos
• FW: that's me :-D
• FW: (no subject)
• FW: it's me
• FW: hi, it's me
• FW: 2 new photos
• FW: new photos
• FW: jenna's photos :)

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

-----Original Message----- From: Jeny K. Sent: Tuesday, September 7, 2004 8:57 PM To: Morpheus check my new photos :)) miss you, jeny k -----Original Message----- From: Jena K. Sent: Tuesday, September 7, 2004 5:23 AM To: friends Check Out Archive.. So.. What Do You Think... Am I Hot? :) Waining For Your Answer Jena Key -----Original Message----- From: jenny k. Sent: Tuesday, September 7, 2004 10:23 AM To: My Tiger (email) new fotos(archived) you asked jenny k -----Original Message----- From: jenna k. (email) Sent: Tuesday, September 7, 2004 11:38 AM To: Cat my new fotos archived )) kiss, jenna k -----Original Message----- From: Jeny Sent: Tuesday, September 7, 2004 8:57 PM To: Neo see the photos in attached archive :)) kiss you, jeny -----Original Message----- From: Jena Sent: Tuesday, September 7, 2004 5:23 AM To: friend Photos in archive.. So.. Am I Hot? :) Waining For Your Answer Jena -----Original Message----- From: Jenna Knukles Sent: Tuesday, September 7, 2004 9:05 AM To: Friends Group in self-extracting archive my photos Jenna :) -----Original Message----- From: jenna (email) Sent: Tuesday, September 7, 2004 11:38 AM To: ma kittie my photos archived )) kiss, jenna -----Original Message----- From: Jeny K. Sent: Tuesday, September 7, 2004 8:57 PM To: Morpheus check out the new photos :)) miss you, jeny k -----Original Message----- From: Jena K. Sent: Tuesday, September 7, 2004 5:23 AM To: friends So.. What Do You Think... Am I Hot? :) Waining For Your Answer Jena Key -----Original Message----- From: Jenna Knukles Sent: Tuesday, September 7, 2004 9:05 AM in archive my new fotos Jenna K :) -----Original Message----- From: jenny k. Sent: Tuesday, September 7, 2004 10:23 AM To: My Tiger (email) new fotos you asked jenny k -----Original Message----- From: jenna k. (email) Sent: Tuesday, September 7, 2004 11:38 AM To: Cat my new fotos zipped )) kiss, jenna k -----Original Message----- From: Jeny Sent: Tuesday, September 7, 2004 8:57 PM To: Neo see the photos :)) kiss you, jeny -----Original Message----- From: Jena Sent: Tuesday, September 7, 2004 5:23 AM To: friend So.. Am I Hot? :) Waining For Your Answer Jena -----Original Message----- From: Jenna Knukles Sent: Tuesday, September 7, 2004 9:05 AM To: Friends Group in archive my photos Jenna :) -----Original Message----- From: jenny Sent: Tuesday, September 7, 2004 10:23 AM To: Mr.X (email) photos you asked jenny -----Original Message----- From: jenna (email) Sent: Tuesday, September 7, 2004 11:38 AM To: ma kittie my photos zipped )) kiss, jenna

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

• myfoto.exe.safe
• myfoto.exe
• photos.selfextracting.exe.safe
• photoarchive.exe
• photofile.exe.safe
• arc.exe.safe
• my_foto.exe
• fotos.exe
• foto.exe
• photos.exe.safe
• photo_se.exe
• new_photos.exe
• newphotos.exe
• myphotos_arc.exe
• my_photos.exe
• photos_arc.exe
• new_photos.zip
• images.zip
• fotos.zip
• my_photos.zip
• myphotos.zip
• photos.zip
• me_01.jpg .pif
• 2004042301.jpg .pif
• with_flowers.jpg .pif
• sunny.jpg .pif
• photo08.jpg .pif
• nude_.jpg .pif
• marie_dancing.jpg .pif
• julia038.jpg .pif

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

• +++ Attachment: No Virus found +++

where it 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 these fake addresses:

• @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.J' and is downloaded from the following websites:

• www.masteratwork.com
• www.professionals-active.com
• www.il-legno.it
• 64.40.98.94
• 69.93.58.116

Limited lifecycle

After September 17th, 2004, 01:18:31 the worm stops working and deletes its file from a hard drive.