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.


Technical Details

This is an Internet worm that replicates by sending infected e-mail messages. It uses several vulnerabilities in the Microsoft Internet Explorer, Outlook and Windows Media Player to start automatically when an infected message is viewed.

Infected Messages

Infected messages that are sent by the worm have various subjects and message bodies, that are generated from several pre-defined strings.

From field: Display name and e-mail address of the infected computer's owner.

Possible subjects:

  • Hi (recipient's name)
  • Dear (recipient's name)
  • Hello (recipient's name)
  • My friend, (recipient's name)
  • How are you !! (recipient's name)

Message bodies are concatenated from the following strings:

  • Hi (recipient's name) , See this funny video.
  • Dear (recipient's name) , This is interesting movie.
  • Hello (recipient's name) + , Open the + cute + penguin.
  • My friend, (recipient's name) , Attached is my amusing clip.
  • How are you !! (recipient's name) , Watch my special tape.

For example,

Dear Vasily Pupkin, Watch my amusing video.

Infected messages contain the following attachments:

  • mi2.chm, 11397 bytes
  • mi2.exe, 73752 bytes
  • mi2.htm, 539 bytes
  • mi2.wmv, 19485 bytes


The worm doesn't install itself in the infected system, and is launched only when it is executed from an infected message.


The worm accesses information from the Windows Address Book (WAB) to get e-mail addresses, and then sends infected messages to these addresses. To send infected messages it uses a direct connection to the default SMTP server set up in the infected system.


The worm sends a "notification message" to several addresses at the "" mail domain that are randomly selected from a list of 120 e-mail addresses. The subject of this message contains the default e-mail address of the infected computer's owner.

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