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.


Technical Details

This is a multi-component network worm. The worm spreads over shared network resources. The worm has bugs and has a little chance to spread over networks.

The worm's components are:

 cnn3.exe   - the main component (Win32 EXE file about 350K of size)
 abc.bat    - BAT file (about 1344 bytes)
 main.exe   - trojan component (Win32 EXE file, 53280 bytes)
 psexec.exe - remote execution utility (not a virus/trojan, Win32 EXE file, 122880 bytes)
 slacke-worm.exe - searches for network addresses (Win32 EXE files, 25K/28K depending on worm version)

The main worm component is "trojan dropping" utility and is detected as "TrojanDropper.Win32.Yabinder".

On run it creates the "C:sp" subdirectory, drops and executes following files in there:


The "main.exe" component is the backdoor trojan, and it is detected as "Backdoor.SdBot".

The "slacke-worm.exe" component looks for network resources and tries to copy and activate worm copy in there with a help of two other components:

 abc.bat - tries to connect to a remote resource by trying a set of logins and passwords
 psexec.exe - is used to run remote worm copy on remote computer.

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