https://www.icann.org/news/announcement-2-2014-12-16-en
16 December 2014
ICANN is investigating a recent intrusion into our systems. We believe a "spear phishing" attack was initiated in late November 2014. It involved email messages that were crafted to appear to come from our own domain being sent to members of our staff. The attack resulted in the compromise of the email credentials of several ICANN staff members.
In early December 2014 we discovered that the compromised credentials were used to access other ICANN systems besides email:
Unauthorized access was also obtained to user accounts on two other systems, the ICANN Blog (blog.icann.org) and the ICANN WHOIS (whois.icann.org) information portal. No impact was found to either of these systems.
Based on our investigation to date, we are not aware of any other systems that have been compromised, and we have confirmed that this attack does not impact any IANA-related systems.
Earlier this year, ICANN began a program of security enhancements in order to strengthen information security for all ICANN systems. We believe these enhancements helped limit the unauthorized access obtained in the attack. Since discovering the attack, we have implemented additional security measures.
We are providing information about this incident publicly, not just because of our commitment to openness and transparency, but also because sharing of cybersecurity information helps all involved assess threats to their systems.
For additional information about the attack, please monitor the ICANN website.