Virus Database

Raptor.1800.b

Description Raptor.1800.b

This is a relatively harmless, memory resident parasitic virus. This virus hooks INT 21h, and writes itself to the end of EXE files that are loaded into the memory or opened. On the 13th of any month, it hooks INT 1Ch also, and runs itself as a video effect. If the date and month correspond by number (January 1st, February 2nd,all), this virus decrypts and displays a message, then reboots the computer:
The Rotpar virus 1st version
Copyright 13.3.1994 - PHP students Blansko CR
Did you like the red color in the background ? We didn't like it !!
We changed it into blue. The texts were also stupid, so we changed them too !!
Many happy returns in the next version of Rotpar. Thanks !

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Bolek.1326

Description Bolek.1326

It's a not dangerous memory resident parasitic virus. It writes itself at the end of EXE-files. On execution it searches for the EXE-files and hits them, then it hooks INT 21h and infects EXE-files that are executed. It hooks INT 1, 3, 9, 15h, 1Ch also, depending on several conditions it displays different characters. This virus also contains the internal text string "Bolek".

Bolero.1000

Description Bolero.1000

These are very dangerous memory resident encrypted parasitic viruses. They hook INT 21h and write themselves to the end of .COM files (except COMMAND.COM) that are executed, opened or accessed with FindFirst/Next DOS functions. The viruses have bugs, and may corrupt the files while infecting them, and infect data files.
The viruses also hook Write DOS function, and depending on the system timer corrupt the files that are saved on disk. The viruses overwrite them with the strings:
"Bolero.1000.a": RAVEL - BOLERO.
"Bolero.1000.b": HANDEL - Carmelite Vesperes.
"Bolero.1254": Divide Overflow
"Bolero.1300": divide overflow
"Bolero.1470": Divide Overflow

Being executed "Bolero.1300" also infects C:DOSFORMAT.COM. When any of the CHKDSK.EXE, SCANDISK.EXE, NDD.EXE programs are executing, this virus does not perform any action with the files.

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