From Sophos newsletter,1st Jan :-
The Internet Systems Consortium, better known as ISC, thinks it might have had a malware infection.
That's the organisation responsible for BIND, a DNS server that is very widely used in production.
You can download free antivirus program from Sophos which will run alongside existing AV program.A useful belt and braces exercise.
No doubt the year will get more threatening as we go along..
Have a safe 2015 !