Summary
Zarma is a memory resident encrypted COM and EXE infector. It was found in France during May 1995.
Zarma is a stealth virus that intercepts interrupt 21h's functions 11h, 12h, 31h, 3Dh, 4Eh, 4Fh, 4Ch, and 6Ch to mask its presence on an infected system. The virus hooks int 3 to its own decryption routine. This routine decrypts a second decryptor on the stack.
Removal
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
Check for the latest database updates
First, check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.
Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
Exclude a file from further scanning
If you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.
Note: You need administrative rights to change the settings.
Technical Details
Once installed in memory the virus also uses int 1Dh, normally a pointer to some video information, as a gateway to call the original int 21h. A new int 1Ch (timer) handler is installed. It plays with the display controller, effectively shaking the picture on a standard VGA machine.
Zarma is also a retro-virus : it is able to deactivate VSAFE, VDEFEND and VWATCH.
The virus contains the following text:
ZARMA-VIR by T. Power *** Claudia Schiffer Lives !!!..
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