Editing HyperCard (section)

===Exploits===
The first HyperCard virus was discovered in Belgium and the Netherlands in April 1991.<ref>{{cite news|work= MacWEEK|title= Latest Mac viral infection hits the stacks: HyperCard affliction turns up in Europe (includes related article on forms virus attacks take)|date= April 16, 1991}}</ref>

Because HyperCard executed scripts in stacks immediately on opening, it was also one of the first applications susceptible to [[Macro virus (computing)|macro viruses]]. The Merryxmas virus was discovered in early 1993<ref>{{Citation |url= http://www.umich.edu/~archive/mac/util/virus/00index.txt |publisher= University of Michigan |type= list |title= Antivirus software for Macintosh |access-date= March 18, 2010}} includes<code>/mac/util/virus/merryxmaskiller.sit.hqx 8 4/27/93  BinHex4.0,StuffIt3.50 Eliminate a script-based virus called "merryxmas." Requires HyperCard 2.0.</code></ref> by Ken Dunham, two years before the ''Concept'' virus.<ref>{{Citation|place=[[Canada|CA]] |publisher=UQAM |url=http://pan.uqam.ca/pan/pmwiki.php/HyperCard/FAQ048 |contribution=HyperCard |title=Pantechnicon |type=wiki |url-status=dead |archive-url=https://web.archive.org/web/20060926162730/http://pan.uqam.ca/pan/pmwiki.php/HyperCard/FAQ048 |archive-date=September 26, 2006 |df=mdy-all }}</ref> Very few viruses were based on HyperCard, and their overall impact was minimal.