Virus Profile: Joker

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Virus Profile information details
Risk Assessment: Home Low | Corporate Low
Date Discovered: 12/1/1989
Date Added: 12/15/1989
Origin: Poland
Length: ??? Bytes
Type: Virus
Subtype: File Infector
DAT Required: 4002
Removal Instructions
   
 
 
   

Description

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.

Indication of Infection

Files which are infected with the Joker virus displays bogus error messages and comments. These messages and comments can be found in the infected files at the beginning of the viral code. Here are some of the messages and comments that may be displayed:

"Incorrect DOS version"
"Invalid Volume ID Format failure"
"Please put a new disk into drive A:"
"End of input file"
"END OF WORKTIME. TURN SYSTEM OFF!"
"Divide Overflow"
"Water detect in Co-processor"
"I am hungry! Insert HAMBURGER into drive A:"
"NO SMOKING, PLEASE!"
" Thanks."
"Don't beat me !!"
"Don't drink and drive."
"Another cup of cofee ?"
" OH, YES!"
"Hard Disk head has been destroyed. Can you borow me your one?"
"Missing light magenta ribbon in printer!"
"In case mistake, call GHOST BUSTERS"
"Insert tractor toilet paper into printer."

Methods of Infection

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.

Aliases

Jocker
   

Virus Family Statistics (over the past 30 days)

Family Statistics information
Virus Name Infected Files Scanned Files % Infected Computers
Joker 8 282057 0.00

Virus Characteristics

Joker is a file infecting virus. It infects .EXE files. This virus may also alter .DBF files, adding messages to them.

Additional Comments:
The Joker virus was isolated in Poland in December, 1989. This virus is a generic .EXE file infector, and is a poor replicator (i.e., it does not quickly infect other files). Programs which are infected with the Joker virus will display bogus error messages and comments. These messages and comments can be found in the infected files at the beginning of the viral code. Here are some of the messages and comments that may be displayed: "Incorrect DOS version" "Invalid Volume ID Format failure" "Please put a new disk into drive A:" "End of input file" "END OF WORKTIME. TURN SYSTEM OFF!" "Divide Overflow" "Water detect in Co-processor" "I am hungry! Insert HAMBURGER into drive A:" "NO SMOKING, PLEASE!" " Thanks." "Don't beat me !!" "Don't drink and drive." "Another cup of cofee ?" " OH, YES!" "Hard Disk head has been destroyed. Can you borow me your one?" "Missing light magenta ribbon in printer!" "In case mistake, call GHOST BUSTERS" "Insert tractor toilet paper into printer." This virus may also alter .DBF files, adding messages to them. The sample in the author of this listing possession does not replicate on an 8088 based system. This entry has been included since the sample may have been damaged before its receipt by the author. At best, there is a serious bug in the replication portion of this virus which prevents it from replicating.

   
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.

   

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