SofiaTerminator.839
Description SofiaTerminator.839
These are parasitic viruses. Being executed they trace INT 13h, 21h, hook INT 21h and stay memory resident. They write themselves to the end of COM files that are accessed. They contain the text string:
Sofia 1993 by TERMINATOR
"Sofia_Terminator.839" is a dangerous virus. Depending on the system timer it formats several random selected disk sectors.
"Sofia_Terminator.887,889,1369" search at the end of the file for zero area 887/889/1369 bytes of length. If there is such area, the virus overwrites it. In this case the file length does not grow.
"Sofia_Terminator.1369" also infects EXE files. Depending on the system time it formats the hard drive sectors.
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DrJohn.2000
Description DrJohn.2000
It is not a dangerous memory resident parasitic virus. It writes itself to the end of COM and EXE files. When an infected file is executed, the virus infects the C:COMMAND.COM file, then hooks INT 13h, 21h and infects the files that are opened. Depending on the system date (one month after infecting) the virus displays the message in Russian. The virus also contains the text strings:
c:command.com
*Doctor John*!
Dron.1024
Description Dron.1024
It is not a dangerous memory resident parasitic virus. It hooks INT 21h and writes itself to the end of EXE-files that are executed. Depending on its internal counters the virus displays some picture (corrupted?) and the message:
Moscow Institute of Physics and Technology (c) 1994
The virus also contains the text string:
* DRON Ver 1.00, PhysTech,(c) 1994 *
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