TA505 is a very active – almost tireless - threat actor that prepares one campaign after another from Monday to Friday. They target organizations across industries / government in many countries around the world including Canada, Germany, South Korea, the UK, and the USA. A severe threat to a great number of organizations: on one side, they conduct Big Game Hunting operations, that is encrypting large parts of a corporate network to extort high ransom payouts. On the other side, they likely work on initial access development and hand over network access to associated threat actors. In this blog post, I will summarize what I know about TA505 as of September 2020, leaving the past aside.