Kaspersky Threats

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

This is a worm virus spreading via the Internet being attached to infected emails. The worm consists of several components. All of them are Windows PE EXE files, written in Visual Basic.

 Main file:            "iLLeGaL.exe", about 81K of size
 Spreading component:  "Mplayer.exe", about 14K (compressed by UPX, decompressed - 37K)
 SMTP control:         "SMTP.ocx", about 26K (compressed by UPX, decompressed - 90K)

Installing

When the main worm file is run it installs itself and its components to the system. While installing the worm copies its main file to the Windows system directory with the name "iLLegGaL.exe". Other worm components are installed to the same directory. The "Mplayer.exe" component is then registered in system registry auto-run key:

 HKLMSoftwareMicrosoftWindowsCurrentVersionRunServices
  iLLeGaL = %SystemDir%Mplayer.exe

The worm then displays a fake Flash animation and the message:

 Sorry !
  Looooooooool , thanx fo da time u spent thinkin ov me

Spreading

The worm reads victim emails from the MS Outlook address book and searches for email addresses in .HTM and .HTML files. To send infected messages the worm uses direct connection to SMTP server.

The infected messages have:

 Subject:  Fwd: Crazy illegal sex !
 Body:     is randomly selected from a file on C: drive
 Attach:   "iLLeGal.exe" or "illegalSex.zip"

The worm activates from infected email only if a user clicks on the attached file. The worm then installs itself to the system, runs its spreading routine and payload.

Payload

The worm creates new key (counter) in system registry:

  HKLMiLLeGal

This counter is being increased on each worm start. When the counter reaches '5' the worm deletes all files on the D: E: F: G: drives and then displays the message:

  ZaCker
   No Peace Without war,i hate war but im forced to love it,Hidden Power's gonna b there wherever u r

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

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