DC StingRays alleged to be Israeli devices. North Korea is slipping malware past defenses by putting it into old, obscure file formats. Ryuk ransomware gets some spyware functionality. Google has purged Joker-infested apps from the Play store. The US Defense Department explains its “multifaceted” approach to cyber deterrence. The FBI warns that business email compromise is on the upswing, and offers some advice on staying safe. Awais Rashid from Bristol University with warnings on accepting default settings on mobile devices. Guest is Bill Conner from SonicWall on side channel attacks.