Such institutions included Bank of America, Wells Fargo and PNC. The source of the matter? A DDoS attack presumably originating in the Middle-East, sources signaled to the news organization.
The New York Times identified the hacking group Izz ad-Din al-Qassam Cyber Fighters as the culprit and noted the attackers were demanding the now infamous amateur anti-Islam film Innocence of Muslims be removed from the internet.
DDoS attacks organize a network of infected computer systems to visit web presences, thus overwhelming a target’s servers.
Frustrated customers, meanwhile, took to social networks to express their displeasure with the outages.
“The nature of this attack is sophisticated enough or large enough that even the largest of the financial institutions would find it difficult to defend against,” commented Rodney Joffe of security firm Neustar in a report from Bloomberg Businessweek. That story also noted that the attack was large enough to draw attention from White House officials.