Detect date

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: Worm

Worms spread on computer networks via network resources. Unlike Net-Worms, a user must launch a Worm in order for it to be activated. This kind of worm searches remote computer networks and copies itself to directories that are read/write accessible (if it finds any). Furthermore, these worms either use built-in operating system functions to search for accessible network directories and/or they randomly search for computers on the Internet, connect to them, and attempt to gain full access to the disks of these computers. This category also covers those worms which, for one reason or another, do not fit into any of the other categories defined above (e.g. worms for mobile devices).

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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.


The worm loads the .dll file to all active processes.

The worm also intercepts mouse and keyboard events if one of the processes listed below has been launched:


The worm harvests account data relating to the following games:

Wanmi Shijie or Perfect World
Dekaron Siwan Mojie
HuangYi Online
Rexue Jianghu
Seal Online
Maple Story
R2 (Reign of Revolution)

Harvested data is sent to the remote malicious user's site.

The worm also modifies the following system registry key parameter values:

"CheckedValue" = "0"
"Hidden" = "2"
"ShowSuperHidden" = "0"
"NoDriveTypeAutoRun" = "0x91"
For example Worm.Win32.AutoRun.beot:

Worm copies itself to local disks and accessible network resources. It is Windows (PE-EXE file). It is 47733 bytes in size. It is packed by FSG. Unpacked file size is about 160 Kb. It is written in Delphi.


Once launched, the worm copies its body to a system disk of a user’s computer.

To ensure that the copy created is launched automatically each time the system is rebooted, the following registry key is created:



The worm copies its body at all writable removable disks connected to the infected computer. The file "AutoRun.inf" is created together with a copy at the root of an infected disk. It provides for a copy to run each time a user opens an infected removable disk using "Explorer".

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