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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: 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.


FunLove (aka Fun Loving Criminals) is a benign memory resident parasitic Win32 virus. It affects PE EXE files on local and network drives. Because of its network spreading ability, the virus can infect the local network from one infected workstation, in the case that the network access permission allows for the writing of this user.

The virus contains the following text strings:

 ~Fun Loving Criminal~

When an infected file is run, the virus creates a FLCSS.EXE file in the Windows system directory, writes its "pure" code to there and runs this file. This virus "dropper" (FLCSS.EXE file) has a Win32 PE format and is executed by the virus as a hidden Windows application (under Win9x) or as a service (under WinNT), and the infection routine takes control.

In case an error has occurred while creating the dropper file (when the virus is run from an infected file), the virus runs the infection routine from its example in the infected host file. The file searching and infection process is run in the background as a "thread," and as a result, the host program is executed with no "visible" delays.

The infection routine scans all local drives from C: till Z:, then looks for network resources, scans subdirectory trees there and infects PE files that have a .OCX, .SCR or .EXE name extension. While infecting a file, the virus writes its code to the end of the file to the last file section and patches its entry routine with a "JumpVirus" instruction. The virus checks file names and does not infect the files: ALER*, AMON*, _AVP*, AVP3*, AVPM*, F-PR*, NAVW*, SCAN*, SMSS*, DDHE*, DPLA*, MPLA*.

The virus is related to the Bolzano virus family and patches the NTLDR and WINNTSystem32ntoskrnl.exe files in a similar way the "Bolzano" virus does. The patched files should be restored from backup.

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