Quell.511
Description Quell.511
It is not a dangerous memory resident parasitic virus. It hooks INT 1Ch (system timer), 21h and writes itself to the end of COM files that are executed. The virus INT 1Ch handler each time reads data from CMOS memory - current day and month number, compares them with May 15 and does nothing. It seems that at this day the virus has to run some payload subroutine, but it absents in this virus code.
The virus contains the string:
COMcom
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NetBios.4340
Description NetBios.4340
It is a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM and EXE files that are accessed. When an infected file is executed, the virus disinfects it. The virus overwrites some EXE files with a trojan program that erases CMOS, disk sectors and manifests itself with some video effect. This virus contains the text string:
Retix PC-21 NETBIOS
Neumann.752
Description Neumann.752
It is a very dangerous memory resident parasitic virus. It hooks INT 21h and when any program is executed, the virus searches for COM-files (except COMMAND.COM) and writes itself to the end of the file. On May, 5th the virus erases the disk sectors. The virus contains the text strings:
[ NEUMANN J. (1903-57) V2.7 HUNGARY ]
*.COM
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