Tiso.1279
Description Tiso.1279
This is a harmless memory resident multipartite encrypted (in files) virus. It infects both COM and EXE files. On execution of infected file it hits MBR of hard drive. On loading from infected disk it hooks INT 08h, waits for DOS loading and then hooks INT 21h. It writes itself at the end of files that are executed.
This is a stealth virus on accessing to infected hard drive, it hooks INT 13h to use that function.
Sometimes this virus decrypts and displays:
Nech zije Jozef Tiso, prvy slovensky prezident !
Check other viruses! Be aware! Use Antiviral Software
ADI.1431
Description ADI.1431
These are dangerous memory resident encrypted parasitic viruses. They write themselves to the end of COM files. While infecting a file the viruses encrypt not only its code, but whole contents of the file. The viruses have bugs and may halt the system while infecting a file.
When an infected file is executed, the virus decrypts itself, hooks INT 22h (DOS Terminate call), returns control to the host program, waits for termination call, then hooks INT 8, 1Ch, 21h, 24h. Timer interrupts (INT 8, 1Ch) are used by the virus to disable tracing and debugging. INT 21h is used to intercept access to COM files.
The viruses use several levels of anti-debugging tricks, they also contain the text string:
(c) Beast. Advanced Disk Infector. [ADinf v1.5]
Adin.1488
Description Adin.1488
This is harmless memory resident parasitic virus. It hooks INT 21h and writes itself at the end of COM and EXE files (except COMMAND.COM) and AIDSTEST.EXE.
It infects the files are renamed, closed, or accessed in some other ways.
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