Iranian APT Nimbus Manticore Uses NightLedger Backdoor as Covert Relay

Tue, 28 Jul 2026 13:01:43 +0000

Engineer — Learn: NightLedger is a novel Windows backdoor with WebSocket tunneling capability; no KEV listing or PoC signals exploitation of specific software you’d patch, but understanding the relay technique informs network egress controls and endpoint detection posture.
SOC/IR — Plan: Build detections for anomalous WebSocket tunneling behavior from Windows hosts and hunt for NightLedger IOCs once Recorded Future or similar publishes indicators; ATT&CK mapping to C2-over-WebSocket and proxy relay techniques warrants a new detection rule this quarter.
Leader — Learn: Nimbus Manticore campaign context is useful for sector risk briefings if your organization has exposure in Middle East, Africa, or South Asia operations, but no immediate board-level action required without confirmed targeting of your industry.

Iranian-Threat-Actor on CuraSec