Elvira.459
Description Elvira.459
These are relatively harmless, non-memory resident parasitic viruses. They search for .COM files in the current directory, then write themselves to the end of the file. The viruses replicate themselves only in October and November. In December, they disinfect host files and display the following message:
<-: Tip von Virus ELVIRA 2.1 R: :->
<-: Traue nie Deinem Viren-Scanner! :->
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GreenBios.1131
Description GreenBios.1131
This is a dangerous non-memory resident parasitic virus. It searches for COM files in the current directory and directories that are marked in PATH, then writes itself to the beginning of all files that are found. The virus does not infect the COMMAND.COM file. It also checks/scans the BIOS for the string:
40-P101-001437-00101111-072594-GREEN
and immediately returns to the host program if that string is found.
On Friday the 13th, the virus leaves a memory resident program that hooks INT 1Ch and "shakes" the screen. If the date and month correspond in number, e.g. January 1 (1/1), the virus erases the CMOS.
GreenMonster.711
Description GreenMonster.711
These are memory resident parasitic viruses. "GreenMonster.784" is an encrypted virus. They hook INT 21h and write themselves to the end of .COM files that are executed or opened. The viruses contain the text string:
Green Monster. I"m happy
"GreenMonster.711" is a dangerous virus. Depending on its internal counter it formats the disk sectors.
"GreenMonster.784" does not manifest itself.
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