Andy.998
Description Andy.998
These are dangerous memory resident parasitic viruses. They hook INT 21h, 28h and infect COM files that are executed. The viruses have bugs and halt the system if there is no UMB memory. While infecting they write themselves to the end of the file. The viruses do not infect files immediately when they are executed, but delay it up to INT 28h call (DOS internal idle). So they infect files in the "background".
"Andy.998" also hooks INT 13h and on 15th of any month writes data to disk instead of reading. This definitely corrupts data on the disk. "Andy.1016.b" hooks INT 13h as well, but it disables writing to disks on any day, that corrupts data that is copied or modified. "Andy.1016.a" hooks INT 1Ch and depending on their internal counters changes color of the screen and disables keyboard.
The viruses contain the texts:
"Andy.998": ANDY-3
"Andy.1016.a": ANDY-1
"Andy.1016.b": ANDY-2
Check other viruses! Be aware! Use Antiviral Software
Mini_HHHH.246
Description Mini_HHHH.246
It is a harmless nonmemory resident parasitic virus. It searches for .COM files and writes itself to the end of the file. It contains the text string:
The MiNi-HHHH
Minimax
Description Minimax
It is a harmless nonmemory resident parasitic virus. It searches for .COM files of the current directory and infects them. The feature of this virus consist of the algorithm of the infection: the virus does not append to the end of the file, but reads the file contents into the virus body:
+-------------------------------------------+
¦3 bytes - ¦ file body ¦ virus body ¦
¦jmp to virus ¦ (read buffer) ¦ 122 bytes ¦
+-------------------------------------------+
¦<---------- total - 31125 bytes ---------->¦
The total length of any of infected files is equal to 31125 bytes, if the file length is above than the 'read buffer', the virus does not infect it.
Being executed the infected file searches for not infected .COM file, infects it, then it copies the host file body to the normal position, and jumps to the code of the file.
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