Shanghai.848
Description Shanghai.848
It is a dangerous memory resident parasitic virus. It hooks INT 21h and intercepts the DOS functions 36h, 3Bh. On these calls the virus searches for .COM files and writes itself to the end of the file. On December, 20th it displays the message:
ShangHai Railway Institute
[high ASCII chars, not properly displayable]
and erases the hard drive sectors. It also contains the text string:
*.COM
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Sesc.448
Description Sesc.448
It is not a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of COM files that are executed. The end of each infected file contains the ID-word "SESC".
Sformat.699
Description Sformat.699
This is a very dangerous memory resident parasitic virus. It hooks INT 21h, and writes itself to the end of .COM files that are executed. The virus contains a lot of bugs, so it can halt a computer while installing a memory resident. On Fridays, it formats the hard drive, and contains the text:
Sofia - Slow-Format/M 1992
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