The U.S. Department of Homeland Security's Computer Emergency Readiness Team (US-CERT) said in an alert issued to the security industry on Tuesday that it was a "very serious event."
The agency also advised customers to update their anti-virus software using two patches issued by Symantec. (http://bit.ly/29ug3Ek) (Reporting by Narottam Medhora in Bengaluru; Editing by Anil D'Silva)