Casino.2330

Casino.2330

Threat Detail

  • Malware Type: Virus
  • Malware Sub-type: File Infector
  • Protection Added: 1991-04-15

This is a virus detection. Viruses are programs that self-replicate recursively, meaning that infected systems spread the virus to other systems, which then propagate the virus further. While many viruses contain a destructive payload, it's quite common for viruses to do nothing more than spread from one system to another.


Minimum Engine

5400.1158

File Length

2330

Description Added

1991-04-15

Description Modified

1991-04-15

Malware Proliferation

Casino.2330 is a stealth, memory resident, file infecting virus. It infects .COM files, including COMMAND.COM.

Upon infection, Casino.2330 becomes memory resident at the top of system memory.

Once Casino.2330 is memory resident, it immediately infects the copy of COMMAND.COM located in the C: drive root directory. It infects .COM files when any of three events occur. If the system user issues a DIR command, or a file does an internal DIR command, one .COM file in the current directory is infected. Additionally, if the system user executes an infected file, a .COM file becomes infected. Lastly, Casino infects .COM files that are opened by another file.

Additional Comments:
The Casino virus was submitted in April, 1991 by David Chess of IBM. Casino was first isolated in Malta. This virus is a memory resident infector of .COM files, including COMMAND.COM. The first time a program infected with Casino is executed, Casino will install itself memory resident at the top of system memory. Total system and available free memory, as indicated by the DOS CHKDSK program will decrease by 37,568 to 37,632 bytes. 3,152 bytes in low system memory will also be used by the virus, and interrupts 00, 23, and 30 will point to this area. After Casino is resident, it will then immediately infect COMMAND.COM located in the C: drive root directory. After Casino is memory resident, it will infect .COM programs when any of three events occur. If the system user issues a DIR command, or a program does an internal DIR command, one .COM file in the current directory will be infected. Additionally, if the system user executes an infected program, a .COM program will become infected. Lastly, Casino will infect .COM programs that are opened by another program for any reason. Programs infected with Casino will have a file length increase of 2,332 to 2,346 bytes. The file length increase, however, is mostly hidden if the virus is memory resident. With the virus memory resident, infected files will have a file length increase of 1 to 16 bytes, but occasionally one may show a file length increase of up to 48 bytes. The virus does not alter the file date and time in the disk directory. If Casino is memory resident and the DOS CHKDSK program is executed, file allocation errors will be returned for each infected program. If the CHKDSK/F option is used, program corruption will occur. Casino activates on January 15, April 15, and August 15, when it will play a slot machine game with the system user, with the following message being displayed: "DISK DESTROYER . A SOUVENIR OF MALTA I have just DESTROYED the FAT on your Disk!! However, I have a copy in RAM, and I``m giving you a last chance to restore your precious data. WARNING: IF YOU RESET NOW, ALL YOUR DATA WILL BE LOST - FOREVER!! Your Data depends on a game of JACKPOT CASINO DE MALTE JACKPOT" If the system user looses the game, Casino will trash the file allocation table. Known variant(s) of Casino are:

All Users :
Script,Batch,Macro and non memory-resident:
Use current engine and DAT files for detection and removal.

PE,Trojan,Internet Worm and memory resident :
Use specified engine and DAT files for detection. To remove, boot to MS-DOS mode or use a boot diskette and use the command line scanner:

SCANPM /ADL /CLEAN /ALL

Additional Windows ME/XP removal considerations


Users should not trust file icons, particularly when receiving files from others via P2P clients, IRC, email or other mediums where users can share files.

AVERT Recommended Updates :

* Office2000 Updates

* Malformed Word Document Could Enable Macro to Run Automatically (Information/Patch )

* scriptlet.typelib/Eyedog vulnerability patch

* Outlook as an email attachment security update

* Exchange 5.5 post SP3 Information Store Patch 5.5.2652.42 - this patch corrects detection issues with GroupShield

For a list of attachments blocked by the Outlook patch and a general FAQ, visit this link .
Additionally, Network Administrators can configure this update using an available tool - visit this link for more information .

It is very common for macro viruses to disable options within Office applications for example in Word, the macro protection warning commonly is disabled. After cleaning macro viruses, ensure that your previously set options are again enabled.

The only way to infect a computer with a file infecting virus is to execute an infected file on the computer. The infected file may come from a multitude of sources including: floppy diskettes, downloads through an online service, network, etc. Once the infected file is executed, the virus may activate.
Casino.2330 activates on January 15, April 15, and August 15, when it plays a slot machine game with the system user. The following message is displayed:

"DISK DESTROYER . A SOUVENIR OF MALTA

I have just DESTROYED the FAT on your Disk!! However, I have a copy in RAM, and I``m giving you a last chance to restore your precious data. WARNING: IF YOU RESET NOW, ALL YOUR DATA WILL BE LOST - FOREVER!! Your Data depends on a game of JACKPOT

CASINO DE MALTE JACKPOT"

If the system user looses the game, Casino corrupts the file allocation table(FAT).

Total system and available free memory, as indicated by the DOS CHKDSK program decreases by 37,568 to 37,632 bytes. 3,152 bytes in low system memory is also used by the virus, and interrupts 00, 23, and 30 point to this area. Files infected with Casino have a file length increase of 2,332 to 2,346 bytes. The file length increase is hidden if the virus is memory resident (Stealth techniques). With the virus memory resident, infected files have a file length increase of 1 to 16 bytes, but occasionally one may show a file length increase of up to 48 bytes. The virus does not alter the file date and time in the disk directory.

If Casino.2330 is memory resident and the DOS CHKDSK program is executed, file allocation errors are returned for each infected file. If the CHKDSK/F option is used, file corruption occurs.