Wanna Cry
Most of you should be aware that the Wanna Cry virus is massively infecting un-patched windows machines all around the world. It's particularly affecting the NHS, one of my main clients.
Wanna Cry is one of a line of Viruses that exploit SMBv1 over ports 135 and 445.
A kill switch has been enabled, but this won't protect machines sitting behind http proxies, and there are already reports of new versions without a kill switch.
All windows machines should be isolated and updated a.s.a.p.