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.
Depending on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the suspect file, or ask you for a desired action.
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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 !!!..
Technical Details: Herve Carette, DataRescue sprl