Virus.DOS.TakeControl

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: 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.

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Platform: DOS

No platform description

Description

Technical Details

It is a dangerous memory resident parasitic polymorphic virus. It writes itself to the end of EXE files and the COMMAND.COM file. Then an infected EXE file is executed, the virus infects C:COMMAND.COM and C:DOSCOMMAND.COM files, if they exist. Then the virus returns the control to host EXE program. The virus does not warry about internal COMMAND.COM format and corrupts that file, if it has EXE internal format (Win95 COMMAND.COM).

When an infected COMMAND.COM is executed, the virus hooks INT 21h, stays memory resident and infects EXE files that are executed.

The virus leaves in memory just a half of its code - about 2.8Kb, while infecting a file the virus reads its complete code from the C:COMMAND.COM file, and then writes this code to EXE files.

The virus checks the file names and does not infect the files from the string (four bytes per name - 3P.E*, AHEL*.*, ALIK*.*, APPE*.* and so on):

3P.EAHELALIKAPPEASTAATTRAVASAVG.AZORBINOBOOTBUILCHKDCLEADEFRDFA.DISK
DOSXDPMIDRVSDSWAEMM3EXE.EXEMEXPAF-PRFASTFC.EFDISFINDGPEGGUARHIEWINI.
INSTINTEKERNKRNLLABELGUAMAKEMANDMEMMMOVEMSBAMSCDMSD.MWBANAV.NLSFPAST
PCC.POWEREX.REPLRESTRTM.SCANSETVSHARSHIESMARSORTSUBSTB.ETEMCTRAPTSAF
UCOMUEXEUNDEVCOPVGUAVIRSVIRTVIRUVIVEVS.EVSHIWIN.WINSWSWAXCOP

Starting from July 1997 the virus displays the message and halts the computer:

TAKE CONTROL of yor mind, your body and your soul !!!
(I'm taking control of your machine - he, he, he ...!)
Replace your C:COMMAND.COM and C:DOSCOMMAND.COM and it'll be O.K.
... forever!
Zdar Grisofte, McAfee nebo jiny pocitacovy maniaku, jenz tento virus pitvas.
*** Gratuluju ***
>>> Konecne jsi me dekodoval a dostal se az sem. <<<
    At zije D.J.BOBO a jeho TAKE CONTROL!!!    
--- Virus napsany specialne na podporu antivirovych firem. ---
### Preji ti uspesny boj se vsemi moznymi viry, jako je tento. ###
Grisofte, vase AVG je fakt dobry, ale ve verzi 4.0 pro Windows je dost chyb.
No nic, puvodni CS:IP u EXE nebo prvni tri byty u COMMANDu jsou tady --->

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