Email-Worm.Win32.Runnelot

Parent class: VirWare

Viruses and worms are malicious programs that self-replicate on computers or via computer networks without the user being aware; each subsequent copy of such malicious programs is also able to self-replicate. Malicious programs which spread via networks or infect remote machines when commanded to do so by the “owner” (e.g. Backdoors) or programs that create multiple copies that are unable to self-replicate are not part of the Viruses and Worms subclass. The main characteristic used to determine whether or not a program is classified as a separate behaviour within the Viruses and Worms subclass is how the program propagates (i.e. how the malicious program spreads copies of itself via local or network resources.) Most known worms are spread as files sent as email attachments, via a link to a web or FTP resource, via a link sent in an ICQ or IRC message, via P2P file sharing networks etc. Some worms spread as network packets; these directly penetrate the computer memory, and the worm code is then activated. Worms use the following techniques to penetrate remote computers and launch copies of themselves: social engineering (for example, an email message suggesting the user opens an attached file), exploiting network configuration errors (such as copying to a fully accessible disk), and exploiting loopholes in operating system and application security. Viruses can be divided in accordance with the method used to infect a computer:

• file viruses
• boot sector viruses
• macro viruses
• script viruses

Any program within this subclass can have additional Trojan functions. It should also be noted that many worms use more than one method in order to spread copies via networks.

Class: Email-Worm

Email-Worms spread via email. The worm sends a copy of itself as an attachment to an email message or a link to its file on a network resource (e.g. a URL to an infected file on a compromised website or a hacker-owned website). In the first case, the worm code activates when the infected attachment is opened (launched). In the second case, the code is activated when the link to the infected file is opened. In both case, the result is the same: the worm code is activated. Email-Worms use a range of methods to send infected emails. The most common are: using a direct connection to a SMTP server using the email directory built into the worm’s code using MS Outlook services using Windows MAPI functions. Email-Worms use a number of different sources to find email addresses to which infected emails will be sent: the address book in MS Outlook a WAB address database .txt files stored on the hard drive: the worm can identify which strings in text files are email addresses emails in the inbox (some Email-Worms even “reply” to emails found in the inbox) Many Email-Worms use more than one of the sources listed above. There are also other sources of email addresses, such as address books associated with web-based email services.

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Platform: Win32

Win32 is an API on Windows NT-based operating systems (Windows XP, Windows 7, etc.) that supports execution of 32-bit applications. One of the most widespread programming platforms in the world.

Description

Technical Details

Runnelot is a worm virus spreading via the Internet as an attachment to infected emails. It also infects Win32 EXE files.

The worm itself is a Windows PE EXE file about 9KB in size when compressed by UPX; the decompressed size is about 20KB. It is written in Assembler.

The worm contains a "copyright" text string:

  Runner "Pilot" 01/2003

Installing

While installing the worm writes its code to the Windows system directory with the "Runner.exe" name and registers that file in system registry auto-run key:

 HKLMSoftwareMicrosoftWindowsCurrentVersionRun
   Runner = Runner.exe /auto /rsrc32.dll

Infecting EXE files

The worm looks for PE EXE files and writes itself to the beginning of these files. It looks for victim EXE files in directories located on local and network hard drives.

To release control to host the program the worm creates on disk a disinfected copy and spawns it. In case of an error the worm displays fake error messages:

  Error of loading WIN32.DLL file

  Loading incomplete. Correct work is not warranted!
  Continue?

  General error 1452 in KERNEL32.DLL

  Program terminated

Spreading: EMail

To send infected messages the worm uses direct access to the default SMTP server. To get victim email addresses the worm looks for *.HTM* files, it also writes these email addresses to the "runner.dll" file in the Windows system directory.

The infected messages have different fields that are randomly constructed from several variants:

From: "%str1%%str2%"

where following strings are randomly selected from:

%str1% : Dmitry Eugene Igor Jhon Mark Bill Frank Sam Tim Brad Samuel Dean Tom Robert Mostovoy Losinsky Kaspersky Danilov Smith Woodruf Brown Steel Driver Seldon Forge Stab McAndrew Gregor

%str2": @hotmail.com @yandex.ru @yahoo.com @newmail.ru

Subject: %subj1% %subj2%

 where:

 %subj1% : 

   Weclome to Pink World
   Blacks on Blondes
   New porno movies every day
   TONS of porno movies
   Fucking Wifes

 %subj1% :

   New FREE sex soft
   FREE porno-soft
   + many FREE sex games

The body is randomly constructed from randomly selected text strings:

   SUPERGAME!  +  Look as  +  fine      +  blonde        
   SEX SOFT!   +              hot          mom           
                              black        hitchiker teen
                              dirty        girl          
                              amateur      slut          
                              petite       babe          
                              busty        teen          
                              wet          secretary     
                              wild         wife          


   This is a free demo version, and we hope you want visit our web-site   +
   Please visit our web site                                              +
 +
   WWW.EXPLOITEDPUSSY.COM
   WWW.SLEAZYDREAM.COM
   WWW.ALLHOTPORN.COM
   WWW.TEENFILES.NET
   WWW.ADULTMOVIESTATION.NET
   WWW.DISCRETESEX.COM
 +
   to take more sex programs
   to take full version


   150 GIG OF DOWNLOADABLE MOVIES - FREE PASSWORD
   HIGH QUALITY MPEGS - NEW SCENES EVERY DAY - 100k+ PICS TOO
   Full lenght movies
   THE BEST MOVIES ONLINE
   HUGE archive of previous movies available! TONS of movies
 +
   Full screen quality
   Ultra fast downloads
   Updated every day
   All in DVD quality
   WEBMASTERS MAKE MONEY
   GET FULL ACCESS TO OUR MEMBERS AREA FOR 30 MINUTES - FREE
   GET YOUR 30 MINUTES FREE ACCESS
   A new 150mb full lenght movie is added every day
 +
   Install NOW!!!
   Installer in attach
   Test our soft now!

or randomly selected from variants:

   We presents to you ours new sex game as adversting
   Install a locator of FREE sex movies of our site as adversting
   Install porno screen saver as adversting
   This is a new imitator as adversting

Attachment:

   sexy       + girls.      + dll
   hottest      blonde.   
   cumshot      pamela.   
   analsex      lesbians. 
   oralsex      teens.    
   asian        virgins.  
   hardcore     .
   slut
   doggy
   sucking
   messy

Payload

On February 13, March 7,16, April 21, May 8,18, June 11, July 3, August 29, October 30, November 5,26, December 11,30 the worm overwirtes all files in "Personal" folders ("My Documents", "History", "Cookies", e.t.c.).

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Find out the statistics of the vulnerabilities spreading in your region on statistics.securelist.com