Post #4013330

A theme worth sitting with from this week's reporting: the malicious traffic wasn't hiding near trusted infrastructure, it was flowing through it. Group-IB's HollowGraph runs its C2 inside a compromised Microsoft 365 calendar. Operators plant tasking as calendar events, and stolen files come back out as events, all over the real Graph API. https://www.reput.io/blog/reputation-radar-03 #blueteam #threatintel #infosec