W.559
Description W.559
It's a dangerous memory resident parasitic virus. It hooks INT 21h, 28h and writes itself to the end of EXE-files that are executed. The header of the infected files contains the 'W' character. Depending on the execution of infected file that virus erases disk A: boot sectors and clears floppy parameters in CMOS.
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MSTU.513
Description MSTU.513
These are very dangerous nonmemory resident parasitic viruses. They search for .COM and .EXE files in the current directory and write themselves to the end of the file. While infecting the viruses might corrupt the files. The viruses contain the texts:
This program was written in MSTU,1990
*.exe *.com
MSU.271
Description MSU.271
It is a harmless nonmemory resident parasitic virus. It searches for COM files, then writes itself to the beginning of the file. It contains the text string:
MSU-Virus v1.0:The StartUp !
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