Post #4378187

They've turned your calendar into a postbox. Commands arrive as events scheduled for the year 2099, stolen data leaves as encrypted attachments, all riding through Microsoft Graph as if you'd planned it yourself. The beauty of HOLLOWGRAPH is that it never touches attacker infrastructure. https://cybersec.picussecurity.com/s/hollowgraph-backdoor-turns-microsoft-365-calendars-into-a-c2-channel-28829