Trakia.561
Description Trakia.561
These are harmless memory resident parasitic viruses. They hook INT 21h and writes themselves to the end of COM and EXE files. "Trakia.570" infects the files that are executed.
"Trakia.653" infects EXE files only. Sometimes this virus corrupts the data files.
"Trakia.1070" infects the files that are are accessed. Being executed this virus also searches for EXE files and infects them. It checks the files for specific hexadecimal string and corrects these files, if that string presents at some offsets in the file body.
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BackTime.496
Description BackTime.496
This is a dangerous memory-resident virus. It hooks INT 8 (timer), and INT 21h and hits COM files by a standard way when they are executed.
This virus doesn't restore the registers when the INT 8 is called sometimes. It also contains the text "Joker".
BackTime.512
Description BackTime.512
This is a dangerous memory-resident virus. It hooks INT 8 (timer), and INT 21h and hits COM files by a standard way when they are executed.
The virus manifests itself on CGA-adapter only, it 'shakes' the screen. It also contains the text "Shaker".
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