Suspicious Microsoft Dev Tunnel Domain Resolution via DNS (via dns_query)

ATT&CK techniques

C2

Recon
Resource Dev
Initial Access
Execution
Persistence
Priv Esc
Defense Evasion
Cred Access
Discovery
Lateral Movement
Collection
C2
- T1572Protocol Tunneling
Exfiltration
Impact

What it detects

This rule detects DNS resolution of Microsoft dev tunnel endpoints under the devtunnels.ms domain, which Operation Digital Eye abused to tunnel command and control traffic through trusted Microsoft infrastructure. While the service is legitimate for developers, its presence on servers or non-developer hosts is a strong sign of covert tunneling.

Reporting behind it

Related detections9 linkedT1572 — drag to rearrange

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Suspicious Reverse SSH Tunnel Exposing Local SSH via process_creation

Suspicious OpenSSH Reverse Tunnel Creation via Process Creation

Suspicious OpenSSH Reverse Tunnel Establishment via process_creation

Suspicious LocalToNet Tunneling Tool Execution

Malicious RDP Tunneling via ngrok (via process_creation)

Suspicious UUID Named Pipe Created Consistent with Mythic SMB Agent

Malicious Chisel Reverse Tunnel Execution for Protocol Tunneling

Suspicious Microsoft Dev Tunnel Domain Resolution via DNS (via dns_query)

Pivot detection · T1572 · 9 related

Detection content is published as a reviewed draft. Tune thresholds and exclusions against your own telemetry before enabling this rule for alerting.

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