Classification

Category: Malware

Type: Virus

Aliases: Zarma, T_Power.Zarma, Zarm

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


Automatic action

Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the detected program or file, or ask you for a desired action.

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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 !!!..