Tag Archives: virus

The Morris worm or Internet worm of November 2, 1988 was one of the first computer worms distributed via the Internet. It was written by a student at Cornell University, Robert Tappan Morris, and launched on November 2, 1988 from MIT.

ZAPP is the only real virus for the MSX computer. It was written by Wybe Wijkamp in 1993. The virus infects all COM files and on the screen, the text:

Did you know today;??‘s ZAPP‘s birthday”

Virus.DOS.First.343 (1997) hook INT 21h and writes itself to the end of .COM files that are accessed. The virus contains the text:

First 1.1 Copyright ( ) 1997 DataLife+ Corp.

*Gif made from the video AVG 5.0 Virus Demo Payloads

Semtex virus (1997) hook INT 8, 21h and write themselves to the end of .COM files that are opened or executed. Sometimes they fill the screen with random data. They contain the texts:


S E M T E X by Dusan Toman, CZECHOSLOVAKIA (7)213-040 or (804)212-23


!!! explosive !!! S E M T E X !!! explosive !!! Written by Dusan Toman, CZECHOSLOVAKIA Pyrotechnician Lilo Hedera (7)213-040 or (804)212-23


S E M T E X by Dusan Toman, CZECHOSLOVAKIA *** Have a nice day ***

LivingDeath virus (1997). Depending on the system date the virus encrypts the hard drive sectors and displays the messages:

I am the Living Death.
I am coding your hard disk now.
Your FAT is destroyed and his copy is only in memory.
If you set power off, all your data will be lost !!
Press any key all

Virus LETTER_H.665-C (1996)

NightKing virus (1997) stores the current time in the MBR of the hard drive, and one month after infecting the virus reads to the memory the FAT of the C: drive, then corrupts the FAT, displays the message:

¦ Hello dear friend, your computer is attacking ¦
¦  by NIGHT KING I. virus. If do you like your  ¦
¦   data very much, don't reset your computer   ¦
¦               before midnight !               ¦

then the virus waits till midnight and restores the corrupted data. If the computer is rebooted before midnight the FAT is lost.

DeliverDigi Virus (1995) manifests itself with the video and sound effects, and displays the message:


Tannenbaum, also known as Christmas Tree or XA1 is a slightly polymorphic .com infector from 1990. It displays a Christmas Tree when executed from December 24 to 31.

LSD Virus (1994)  overwrites all files of current directory and manifests itself with a video effect. Then it displays the message:

LSD ViRuS 1.0 Coded By Death Dealer 4/29/94 [TeMpEsT -94]

It also contains the string: Author:

Death Dealer Of [TeMpEsT]Virus:[LSD]