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.
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 !!!..
