Virus Database

Xtac.1564

Description Xtac.1564

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 executed. The length of COMMAND.COM file does not grow, see Lehigh virus. In some cases it searches and erases the files with extensions from the string:
COMEXESYSBATOBJOVROVLINICFGTPUHLPTPLBGICHR

It also contains the text strings:
command.com
*.*
good news! you have justbeen smitten by XTAC - lyndon siao, usc-tc

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Prime.580

Description Prime.580

It is a dangerous nonmemory resident parasitic virus. It searches for .COM files and writes itself to the beginning of the file. While infecting it encrypts and saves the original file beginning to the end of the file. This virus disables the IRQ signals, it can halt the computer. On 1st of any month it displays:
Prime Evil! (C) Spellbound, Line Noise 1992.
Coded in Stockholm, Sweden.
Please spell my name right!

and 'shifts' the screen, if the monitor is CGA or EGA.

Primus Family

Description Primus Family

These are dangerous memory resident parasitic viruses. They copy themselves to the Interrupt Vectors Table, hooks INT 21h and write themselves to the end of COM and EXE files that are accessed. The virus do not perform any harm actions, but while infecting a file they corrupt the BIOS data area at address 0000:0400, that may crash the system. The virus contain the text strings:
"Primus.512":
AcTiOnBoX vIrUs 3
PrImUs
(A)bort, (R)etry, (C)ry

"Primus.528":
Alien Nation Virus
PrImUs
Make My Day Monkey Boy!

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