Editing Microsoft Excel (section)

==Security==
Because Excel is widely used, it has been attacked by hackers. While Excel is not directly exposed to the Internet, if an attacker can get a victim to open a file in Excel, and there is an appropriate security bug in Excel, then the attacker can gain control of the victim's computer.<ref>{{cite journal|url=http://www.computerworld.com/s/article/9128538/Attackers_exploit_unpatched_Excel_vulnerability|title=Attackers exploit unpatched Excel vulnerability|first=Gregg|last=Keizer|journal=[[Computerworld]]|date=February 24, 2009|access-date=March 19, 2019|publisher=[[IDG Communications, Inc.]]|archive-date=July 15, 2014|archive-url=https://web.archive.org/web/20140715034015/http://www.computerworld.com/s/article/9128538/Attackers_exploit_unpatched_Excel_vulnerability|url-status=live}}</ref> UK's [[GCHQ]] has a tool named TORNADO ALLEY with this purpose.<ref>{{cite web|url=https://firstlook.org/theintercept/document/2014/07/14/jtrig-tools-techniques/|title=JTRIG Tools and Techniques|work=[[The Intercept]]|date=July 14, 2014|access-date=March 19, 2019|archive-url=https://web.archive.org/web/20140714224430/https://firstlook.org/theintercept/document/2014/07/14/jtrig-tools-techniques/|archive-date=July 14, 2014|publisher=First Look Productions, Inc.}}</ref><ref>{{cite web|url=https://www.documentcloud.org/documents/1217406-jtrigall.html#document/p4|title=JTRIG Tools and Techniques|page=4|access-date=March 19, 2019|first=John|last=Cook|work=[[The Intercept]]|via=[[DocumentCloud]]|archive-date=August 8, 2014|archive-url=https://web.archive.org/web/20140808040612/https://www.documentcloud.org/documents/1217406-jtrigall.html#document/p4|url-status=live}}</ref>