Virus:Worm/Mytob.EF.2
Date discovered:18/04/2006
Type:Worm
In the wild:Yes
Reported Infections:Low
Distribution Potential:High
Damage Potential:Medium
Static file:Yes
File size:130.200 Bytes
MD5 checksum:94dc803c285627031a5ff01946fa988e
VDF version:6.34.00.198
IVDF version:6.34.00.200 - Wednesday, April 19, 2006

 General Methods of propagation:
   • Email
   • Local network
   • Messenger
   • Peer to Peer


Aliases:
   •  Symantec: W32.Mytob.PE@mm
   •  Kaspersky: Net-Worm.Win32.Kidala.a
   •  TrendMicro: WORM_MYTOB.PT
   •  Sophos: W32/Mytob-HH
   •  VirusBuster: I-Worm.Mydoom.BV
   •  Eset: Win32/Mytob.SF
   •  Bitdefender: Win32.Worm.Mytob.ET


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Disable security applications
   • Uses its own Email engine
   • Registry modification
   • Makes use of software vulnerability
   • Third party control

 Files It copies itself to the following location:
   • %SYSDIR%\ISPSupport.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • %system drive root%\HoT.pif
   • %SYSDIR%\loadwin.scr
   • %SYSDIR%\loadwin.com
   • %SYSDIR%\loadwin.exe
   • %SYSDIR%\winloader.com
   • %SYSDIR%\winloader.exe
   • %SYSDIR%\winloader.scr
   • %SYSDIR%\winload.scr
   • %SYSDIR%\winload.exe
   • %SYSDIR%\winload.com
   • %SYSDIR%\player.scr
   • %SYSDIR%\player.com
   • %SYSDIR%\player.exe
   • %SYSDIR%\microsystem.com
   • %SYSDIR%\microsystem.scr
   • %SYSDIR%\microsystem.exe
   • %SYSDIR%\viewer.com
   • %SYSDIR%\viewer.exe
   • %SYSDIR%\viewer.scr

 Registry The following registry key is added in order to run the process after reboot:

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   • "ISPSystem"="%SYSDIR%\ISPSupport.exe"



The following registry keys including all values and subkeys are removed:
   • HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\sys32x
   • HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\systems

 Email It contains an integrated SMTP engine in order to send emails. A direct connection with the destination server will be established. The characteristics are described in the following:


From:
The sender address is spoofed.
Generated addresses. Please do not assume that it was the sender's intention to send this email to you. He might not know about his infection or might not even be infected at all. Furthermore it is possible that you will receive bounced emails telling you that you are infected. This might also not be the case.


To:
– Email addresses found in specific files on the system.
– Email addresses gathered from WAB (Windows Address Book)
– Generated addresses


Subject:
One of the following:
   • %random character string%
   • Error
   • Good day
   • hello
   • Mail Delivery System
   • Mail Transaction Failed
   • Server Report
   • Status



Body:
–  In some cases it may be empty.
–  In some cases it may contain random characters.

 
The body of the email is one of the lines:
   • test
   • Mail transaction failed. Partial message is available.
   • The message cannot be represented in 7-bit ASCII encoding and has been sent as a binary attachment.
   • The message contains Unicode characters and has been sent as a binary attachment.


Attachment:
The filenames of the attachments is constructed out of the following:

–  It starts with one of the following:
   • body
   • data
   • doc
   • document
   • file
   • message
   • readme
   • test
   • text
   • %random character string%

    The file extension is one of the following:
   • bat
   • cmd
   • exe
   • scr
   • pif
   • zip

The attachment is a copy of the malware itself.

The attachment is an archive containing a copy of the malware itself.



The email looks like the following:


 Mailing Search addresses:
It searches the following files for email addresses:
   • wab
   • adb
   • tbb
   • dbx
   • php
   • sht
   • htm
   • txt
   • tmp


Address generation for TO and FROM fields:
To generate addresses it uses the following strings:
   • adam; alex; andrew; anna; bill; bob; brenda; brent; brian; britney;
      bush; claudia; dan; dave; david; debby; fred; george; helen; jack;
      james; jane; jerry; jim; jimmy; joe; john; jose; julie; kevin; leo;
      linda; lolita; madmax; maria; mary; matt; michael; mike; peter; ray;
      robert; sam; sandra; serg; smith; stan; steve; ted; tom

It combines this with domains from the following list or from addresses found in files on the system

The domain is one of the following:
   • hotmail.com
   • cia.gov
   • fbi.gov
   • juno.com
   • yahoo.com
   • msn.com
   • aol.com


Avoid addresses:
It does not send emails to addresses containing one of the following strings:
   • -._!; -._!@; .edu; .gov; .mil; abuse; accoun; acketst; admin; anyone;
      arin.; avp; be_loyal:; berkeley; borlan; bsd; bugs; certific; contact;
      example; feste; fido; foo.; fsf.; gnu; gold-certs; google; gov.; help;
      iana; ibm.com; icrosof; icrosoft; ietf; info; inpris; isc.o; isi.e;
      kernel; linux; listserv; math; mit.e; mozilla; mydomai; nobody;
      nodomai; noone; not; nothing; ntivi; page; panda; pgp; postmaster;
      privacy; rating; rfc-ed; ripe.; root; ruslis; samples; secur;
      sendmail; service; site; soft; somebody; someone; sopho; submit;
      support; syma; tanford.e; the.bat; unix; usenet; utgers.ed; webmaster;
      www; you; your


Prepend MX strings:
In order to get the IP address of the mail server it has the ability to prepend the following strings to the domain name:
   • gate.
   • mail.
   • mail1.
   • mx.
   • mx1.
   • mxs.
   • ns.
   • relay.
   • smtp.

 P2P In order to infect other systems in the Peer to Peer network community the following action is performed:  


– It searches for the following directories:
   • \My Shared Folder
   • \eDonkey2000\incoming
   • \LimeWire\Shared

   It retrieves shared folders by querying the following registry keys:
   • SOFTWARE\Morpheus
   • SOFTWARE\KAZAA\LocalContent
   • Software\Kazaa\Transfer
   • SOFTWARE\iMesh\Client
   • SOFTWARE\WarezP2P

   If successful, the following files are created:
   • YahooMessenger_Loader; MSN7.0UniversalPatch; MSN7.0Loader;
      KAV2006_Crack; ZoneAlarmPro6.xx_Crack; Angilina_Jolie_Sucks_a_Dick;
      JenniferLopez_Film_Sexy_Enough; BritneySpears_SoSexy;
      DAP7.4.x.x_crack; NortonAV2006_Crack; Alcohol_120%%_patch;
      Outlook_hotmail+_fix; LimeWire_speed++;
      DarkAngel_Lady_get_fucked_so_hardly;
      nice_big_asshole_fuck_Jennifer_Lopez.scr;
      Madonna_the_most_sexiest_girl_in_the_world.com;
      Britney_Spears_sucks_someones_dick.scr;
      Mariah_Carey_showering_in_bathroom.com; MSN7.0UniversalPatch;
      MSN7.0Loader; KAV2006_Crack; ZoneAlarmPro6.xx_Crack; TaskCatcher;
      Opera8; notepad++; lcc-win32_update; RealPlayerv10.xx_crack; nuke2006;
      office_crack; rootkitXP; dcom_patch; strip-girl-3.0; activation_crack;
      icq2006-final; winamp6; xXx Sex xXx; porn in porn; cums in asshole;
      New Sex Movie; big tits; Fucked Hardly; Beautiful ass; Sexy Girl;
      WooooW much sexual; look at the bitch; Sex Movie; film Sex; XXX Movie;
      the best sex clip; Sex in Sex just watch it!!; Nawal-elzoghbi.rm;
      Elissa+3a9y.rm; Nancy-3ajram.rm; Halima-Poland.rm; Hayfaa-Wahbi.rm;
      Christina_Aguilera.rm; Jessica_Simpson.rm; Mariah_Carey.rm; Thalia.rm;
      Beyonce.rm; Jennifer_Lopez.rm; Angilina_Jolie.rm; Madonna.rm;
      Britney.rm; Nawal-elzoghbi.mpeg; Elissa+3a9y.mpeg; Nancy-3ajram.mpeg;
      Halima-Poland.mpeg; Hayfaa-Wahbi.mpeg; Christina_Aguilera.mpeg;
      Jessica_Simpson.mpeg; Mariah_Carey.mpeg; Thalia.mpeg; Beyonce.mpeg;
      Jennifer_Lopez.mpeg; Angilina_Jolie.mpeg; Madonna.mpeg; Britney.mpeg;
      Nawal-elzoghbi.ram; Elissa+3a9y.ram; Nancy-3ajram.ram;
      Halima-Poland.ram; Hayfaa-Wahbi.ram; Christina_Aguilera.ram;
      Jessica_Simpson.ram; Mariah_Carey.ram; Thalia.ram; Beyonce.ram;
      Jennifer_Lopez.ram; Angilina_Jolie.ram; Madonna.ram; Britney.ram;
      Nawal-elzoghbi.mpg; Elissa+3a9y.mpg; Nancy-3ajram.mpg;
      Halima-Poland.mpg; Hayfaa-Wahbi.mpg; Christina_Aguilera.mpg;
      Jessica_Simpson.mpg; Mariah_Carey.mpg; Thalia.mpg; Beyonce.mpg;
      Jennifer_Lopez.mpg; Angilina_Jolie.mpg; Madonna.mpg; Britney.mpg

   These files are copies of the malware itself.

 Messenger It is spreading via Messenger. The characteristics are described below:

– AIM Messenger


To:
All entries in the contact list.


Message
The sent message looks like one of the following:

   • look at this video http://%IP address%:2001/%random character string%

   • hehe, watch this http://%IP address%:2001/%random character string%

   • your going to like this :D http://%IP address%:2001/%random character string%

   • lol, don't forget to watch this video http://%IP address%:2001/%random character string%

   • LOL, this shit is funny http://%IP address%:2001/%random character string%

The URL then refers to a copy of the described malware. If the user downloads and executes this file the infection process will start again.


Propagation via file
It sends a file with one of the following filenames:
   • crazy5.scr
   • exposed.scr
   • funny2.scr
   • funny1.scr
   • haha.scr
   • picture1.scr
   • mjackson.scr
   • lucky.scr
   • crazyjump.scr
   • funny3.scr

 Network Infection In order to ensure its propagation the malware attemps to connect to other machines as described below.


Exploit:
It makes use of the following Exploits:
– MS01-059 (Unchecked Buffer in Universal Plug and Play)
– MS02-018 (Patch for Internet Information Service)
– MS02-061 (Elevation of Privilege in SQL Server Web)
– MS03-007 (Unchecked Buffer in Windows Component)
– MS03-026 (Buffer Overrun in RPC Interface)
– MS03-049 (Buffer Overrun in the Workstation Service)
– MS04-007 (ASN.1 Vulnerability)
– MS04-011 (LSASS Vulnerability)
– MS05-039 (Vulnerability in Plug and Play)
– Bagle backdoor (port 2745)
– Kuang backdoor (port 17300)
– Mydoom backdoor (port 3127)
– NetDevil backdoor (port 903)
– Optix backdoor (port 3140)
– SubSeven backdoor (port 27347)
– DameWare remote administration (port 6129)


IP address generation:
It creates random IP addresses while it keeps the first two octets from its own address. Afterwards it tries to establish a connection with the created addresses.


Infection process:
Creates a TFTP or FTP script on the compromised machine in order to download the malware to the remote location.


Remote execution:
–It attempts to schedule a remote execution of the malware, on the newly infected machine. Therefore it uses the NetScheduleJobAdd function.

 Process termination List of processes that are terminated:
   • AVPCC.EXE; AVKSERV.EXE; ECENGINE.EXE; FP-WIN.EXE; VETTRAY.EXE;
      ACKWIN32.EXE; AVNT.EXE; ESAFE.EXE; FPROT.EXE; F-PROT95.EXE;
      IOMON98.EXE; AVWIN95.EXE; AVE32.EXE; ANTI-TROJAN.EXE; _AVPCC.EXE;
      APVXDWIN.EXE; CLAW95CF.EXE; _FINDVIRU.EXE; FINDVIRU.EXE; NAVNT.EXE;
      VET95.EXE; SCAN32.EXE; RAV7.EXE; NAVAPW32.EXE; VSMAIN.EXE;
      GUARDDOG.EXE; RULAUNCH.EXE; ALOGSERV.EXE; OGRC.EXE; NAVAPSVC.EXE;
      NSPLUGIN.EXE; NOD32.EXE; _AVPM.EXE; AMON.EXE; NAVWNT.EXE; NAVW32.EXE;
      SPIDER.EXE; AVPM.EXE; ATGUARD.EXE; KAVPF.EXE; BLACKICE.EXE;
      LOOKOUT.EXE; CMGRDIAN.EXE; IAMAPP.EXE; OUTPOST.EXE;
      OUTPOSTINSTALL.EXE; ZONEALARM.EXE; ZONALM2601.EXE; ZATUTOR.EXE;
      ZAPSETUP3001.EXE; ZAPRO.EXE; OUTPOSTPROINSTALL.EXE; ZONALARM.EXE


 Backdoor The following ports are opened:

– %SYSDIR%\ISPSupport.exe on TCP port 16248 in order to provide an FTP server.
– %SYSDIR%\ISPSupport.exe 2001 in order to provide an HTTP server.

 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

Description inserted by Irina Boldea on Monday, June 19, 2006
Description updated by Irina Boldea on Wednesday, June 21, 2006

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