Christmas Tree EXEC
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Christmas Tree EXEC was the first widely disruptive replicating network program, which paralysed several international computer networks in December 1987.
Written by a student at the Clausthal University of Technology in the REXX scripting language, it drew a crude Christmas tree - then sent itself to each entry in the target's email contacts file. In this way it spread onto the European Academic Research Network (EARN), the BITNET, and IBM's world-wide VNET. On all of these systems it caused massive disruption.
Its core mechanism was essentially the same as the ILOVEYOU worm of 2000 - although running on mainframes rather than PC's, spreading over a different network, and scripted using REXX rather than VBScript.
[edit] Trivia
The name is sometimes written "CHRISTMA EXEC" because the script file is an "EXEC" (executable), and the file concerned was in fact named CHRISTMA, as IBM systems of the day only supported 8 character filenames. The user was prompted to: "...just type CHRISTMAS..." - and this in fact launched the "worm".
