IM-Worm.Win32.Jitux

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: IM-Worm

IM Worms spread via instant messaging systems (such as ICQ, MSN Messenger, AOL Instant Messenger, Yahoo Pager, Skype, etc.) In order to spread, IM-Worms usually send a link (URL) to a list of message contacts. The link leads to a network resource where a file containing the body of the worm has been placed. This tactic is almost exactly the same as that used by Email-Worms.

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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

Jitux is an Internet worm that spreads via the MSN Messenger system. It is written in Visual Basic and its' size is about 24KB.

The worm sends messages with the URL of the downloadable version of the worm.

Once the worm is launched, it scans the victim MSN Messenger contact list and sends all contacts the following message:

http://www.home.no/[censored]/jituxramon.exe

Jitux repeats this process over set intervals (about 1 minute).

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