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
Class: Virus
Viruses replicate on the resources of the local machine. Unlike worms, viruses do not use network services to propagate or penetrate other computers. A copy of a virus will reach remote computers only if the infected object is, for some reason unrelated to the virus function, activated on another computer. For example: when infecting accessible disks, a virus penetrates a file located on a network resource a virus copies itself to a removable storage device or infects a file on a removable device a user sends an email with an infected attachment.Read more
Platform: JS
JavaScript (JS) is a prototype-based programming language. JavaScript has traditionally been implemented as an interpreted language. The most common use is in web browsers, where it is used for scripting to add interactivity to web pages.Description
Technical Details
JS.Fortnight is an Internet worm that uses infected emails with hidden links to an Internet Web page from which it downloads its infected code.
Infected messages contain a hidden link to a Web page containing the worm. When a user opens an infected email message the link opens and downloads the worm's body and executes it in a hidden frame.
The worm uses the Microsoft VM ActiveX security vulnerability for which Microsoft released a security patch three years ago. This allows the worm's code to be executed on the local (victim) computer.
More information about this vulnerability and the patch for it is
available at:
http://www.microsoft.com/technet/security/bulletin/ms00-075.asp
The Fortnight worm uses a cookie named "TF" to mark infected computers. If this cookie is absent it changes the Internet Explorer default Web page address to a pornographical site.
Next the worm copies the default signature of Outlook Express 5.0 to the file C:Program Filessign.htm with the link added to its body. All messages sent later from an infected computer contain this link.
The Fortnight worm creates 3 links in the "Favorites" folder:
"SEXXX. Totaly Teen.url" "Make BIG Money.url" "6544 Search Engines Submission.url"
Fortnight installs two cookies that act as infection marks.
The site that contained the worm's body was blocked as soon as the worm appeared in the wild and is still down.
I-Worm.JS.Fortnight.f
The Fortnight.f worm creates 3 links in the "Favorites" folder:
"Nude Nurses.url" "Search You Trust.url" "Your Favorite Porn Links.url."
Read more
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