How can security teams detect Ligolo activity?

What Ligolo Detection Looks Like in Practice

Ligolo is easiest to spot when you stop looking for a named tool and start looking for the behaviour it creates. The useful signal is a covert relay path, where an internal host suddenly becomes a proxy for traffic that should not normally traverse it. That pattern often shows up alongside unusual long-lived outbound connections, odd local listening behaviour, and traffic that does not match the host’s usual role.

Because Ligolo can hide inside otherwise normal-looking remote access, endpoint findings matter more than a single network indicator. A relay process that appears only during suspicious sessions, especially on a workstation or server that is not supposed to broker traffic, deserves attention. The best detections combine process telemetry, connection state, and which internal services become reachable through that relay.

Security teams should treat “unexpected path creation” as the core detection idea. If an internal asset starts forwarding traffic to destinations or ports that do not align with approved administration, that is more useful than trying to key only on the binary name. That approach also helps when the operator renames the executable, embeds it in another process, or launches it from a location that looks legitimate at first glance.

For broader command-and-control tradecraft, Command and Control (C2) Guide is the most direct internal reference for understanding how tunnelling, beaconing, egress control, and proxy-based control channels fit together. Ligolo detection sits in that same operational pattern, so the same reasoning applies when you are separating normal remote administration from hidden relay infrastructure.

Telemetry That Usually Surfaces Ligolo

Endpoint telemetry is the strongest starting point because Ligolo often leaves a small host-side footprint while the interesting effect appears in the network path. Watch for unfamiliar user-space processes initiating repeated outbound sessions, especially when those sessions persist beyond a normal support window or appear from hosts that do not usually originate remote tooling.

Network flow data then helps confirm whether the process is actually relaying traffic rather than merely connecting out. Useful clues include unexpected fan-out from a single internal host, forwarded sessions that make internal services appear externally reachable, and traffic patterns that do not line up with the host’s authorised administrative use.

DNS, proxy, and firewall records can add context when the relay crosses normal boundaries. A hidden tunnel may look low volume and stable, but the value is in correlation: an endpoint process, a persistent outbound connection, and unusual reachability to internal ports or services all need to line up before you call it benign administration.

MITRE ATT&CK remains a useful reference point for mapping that behaviour to the underlying adversary technique, and the MITRE ATT&CK Enterprise Matrix helps analysts place Ligolo-style proxying in the wider tunnel and remote-access pattern. That matters because detection logic improves when it is written around technique behaviour, not a single tool signature.

How to Separate Legitimate Remote Access from Abuse

The practical challenge is not finding every proxy, it is deciding which proxy is suspicious. Legitimate remote access usually has a known origin, an approved endpoint, an expected schedule, and a documented administrative purpose. Ligolo activity tends to violate at least one of those assumptions, most often by introducing an unauthorised relay path between an internal service and external control infrastructure.

Build your review around role, path, and persistence. A server that suddenly behaves like a router or proxy should be questioned. So should any host that exposes internal-only services through a tunnel without a corresponding change request, maintenance ticket, or approved jump-host pattern. If your telemetry shows the relay surviving restarts or recurring on the same schedule, treat that as a stronger indicator than a single short session.

The cleanest enrichment comes from comparing the observed traffic against the organisation’s sanctioned remote-access design. When the route, source, or session behaviour does not fit the approved pattern, the issue is not just “unusual network traffic”, it is likely a trust-boundary violation that deserves incident handling rather than routine tuning.

When you need a control-oriented frame for that judgment, the NIST Cybersecurity Framework 2.0 is useful for structuring detect-and-respond workflows around anomalous communications, visibility, and recovery. For operators, that means your detection logic should feed an investigation path, not stop at alerting on an outbound connection.

Practitioner Guidance

What to prioritise: Start with correlation, not signature hunting. A single proxy process is often ambiguous, but a proxy process plus persistent outbound connectivity plus new reachability to internal services is a much stronger case for investigation.

What to verify: Confirm whether the relay behaviour is authorised, whether the source host normally brokers traffic, and whether the exposed internal service became reachable through a path that your remote-access design never intended. If those answers do not line up, treat the event as likely abuse rather than a benign remote-support exception.

Practitioner takeaway: Ligolo detection is strongest when teams hunt for the network effect of covert relaying, not just a specific process name or hash, because the abuse is defined by unexpected path creation and persisted access.

Related resources from NHI Mgmt Group

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• Why is the abuse of NHIs a priority for security teams?
• What is the difference between SAST and DAST for security teams?