Turn.557
Description Turn.557
These are not dangerous memory resident parasitic viruses. They hook INT 21h and write themselves to the beginning of .COM files that are executed. They manifest themselves by a video effect. On 31st of any month on every infection the viruses turn one letter over by using access to video fonts. The first letter to turn is 'A', the second - 'B' e.t.c.
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Enter.613
Description Enter.613
It is a dangerous memory resident parasitic virus. It hooks INT 9, 21h and writes itself to the end of EXE files that are accessed. By hooking INT 9 (keyboard) the virus calculates ENTER keystrokes and on the 100th ENTER reboots the computer.
Enterprise.625
Description Enterprise.625
This is a benign memory resident parasitic virus. It hooks INT 21h, and writes itself to the end of COM-files that are executed. On December 6, it decrypts and displays the following message while halting the system:
CPU error
System halted
It contains the internal text string:
ENTERPRISE 2
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