Turla, a Russian-speaking cyberespionage group, has been using PDF files in emails to control a stealthy Microsoft Outlook backdoor. Turla is the only threat group using a backdoor that’s completely controllable via email. The most recent victims of the malware include Germanys Federal Foreign Office; a major defense contractor; and the foreign offices of at least two other European countries. The latest version- released in April 2018-incorporates the ability to execute PowerShell scripts directly in computer memory.”]