They did it to protest the ongoing Israeli onslaught on the Gaza Strip.
A group of Iranian hackers have managed to bring down the Israeli secret service's web site and the site had to stop its activity for several hours, Iranian media launched information.
Ashiyaneh, a group of Iranian hackers announced they had carried out the cyber attack against Mossad's web site to protest the ongoing Israeli onslaught on the Gaza Strip.
The web site was down more than two hours and the Israeli intelligence service failed to resume the function of the Web site.
Source : anspress.com