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: IRC-Worm

This type of worm spreads via Internet Relay Chat. Like email worms, IRC Worms have two ways of spreading via IRC channels. The first involves sending an URL which leads to a copy of the worm. The second technique is to send an infected file to an IRC channel user. However, the recipient of the infected file has to accept the file, save it to disk, and open (launch) it.

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Platform: VBS

Visual Basic Scripting Edition (VBScript) is a scripting language interpreted by Windows Script Host. VBScript is widely used to create scripts on Microsoft Windows operating systems.


Technical Details

IRC-Worm.Evion Evion is an IRC worm spreading via IRC channels. The virus is written in Visual Basic Script (VBS). It overwrites .vbs and .html files on all local and mapped drives.

When the worm is executed it does the following:

Evion creates copies of itself in the root directory of disk C: in the file "Win32 Strt.exe.vbs " and in the system directory file "BootLoader.exe.vbs" as well as in the root Windows directory in the files"Jokes.htm" and "Winupdate.exe"

Evion overwrites these existing files with a copies of itself:


Evion registers the files "BootLoader.exe.vbs" and "Win32 Strt.EXE" in the automatic launch string of the system registry:

 HKEY_LOCAL_MACHINEMicrosoftWindowsCurrentVersionRun - (BootLoader.exe.vbs)
 HKEY_LOCAL_MACHINESoftwareMicrosoftWindowsCurrentVersionRunServices - (Win32 Strt.EXE)

Evion searches for the all .vbs files and overwrites the existing .vbs files with a copies of itself. Files that have the extensions .htm, .html, .asp, .htx, and .hta are replaced with the .HTML version of the worm.

The "Script.ini" file is a short mIRC program that sends the %Windir%Jokes.htm file to everybody who enters an infected channel.

The worm activates its payload three different days (October 15th, November 23rd and December 25th), and displays a Message Box with the following respective texts:

with Message box title "my b-day" and text "happy birthday kefi" - 15 october
with Message box title "11/23!" and text "holy sh*t! it's 11/23" - 23 november
with Message box title "kefi [rRlf]" and text "Organized religion controls the world" - 25 december

On these payload activation days the worm also creates 16 text files in the Windows Startup folder. The file name uses the format: StartupEvion(n).txt, where n is between 0 and 15 (inclusive). These files contain 50 text strings of randomly generated text that is selected from these three lines:

You've done and gotten your self infected with Vbs.Evion by kefi [rRlf] [rRlf] ownz joo bitch Catfish_VX are lamers. This virus was constructed for them to steal

On days other than the ones on which the payload runs, a text document is created in the Desktop Windows directory. The file name uses the format "Desktop%day% - %month%.vir.txt".

These files contain the following text:

 today you did not experience the payload of Vbs.Evion
 kefi [rRlf]

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