No alert fired. Hunt through weeks of quiet telemetry to prove or disprove a stealthy, low-and-slow intrusion, then write a detection precise enough to matter.
No alert has fired at Vantle Financial, a regional financial services firm, but a Financial Sector Intelligence Exchange (FSIX) advisory warns that peer institutions were breached by an actor tracked as GRAY LEDGER, known for abusing signed remote-support binaries, disguised scheduled-task persistence, LOLBins, and deliberately slow beaconing. Form a hypothesis, pull four quiet weeks of EDR, scheduled-task, and proxy/DNS telemetry from the Treasury Ops workstations, and prove or disprove compromise before writing a detection that will actually hold up.