A hacker known as the Jester claimed responsibility for the DoS attack that left WikiLeaks.org crippled for hours on Sunday, shortly before the site began posting its largest-to-date release of classified U.S. diplomatic cables, according to CNN.
The cyber vigilante, who describes himself as a “hacktivist for good,” tweeted he took the site down “for attempting to endanger the lives of our troops, ‘other assets’ & foreign relations.”
According to CNN, the Jester has a history of attacking extremist websites. He recently targeted a handful of websites for reasons including “online incitement to cause young Muslims to carry out acts of violent jihad,” “distributing jihadist instructional materials,” and “for the online radicalization of young Muslims in US and Europe.”
F-Secure Chief Research officer Mikko HyppÃ¶nen told AFP he believed the Jester was indeed behind the WikiLeaks attack:
“He’s demonstrated previously that he is capable of launching effective denial-of-service attacks, and he’s claimed the responsibility for this one as well,” HyppÃ¶nen said in an email. “He has the capability and the motive.”