Description
Identifies when MagicDNS is turned off on the tailnet. Disabling MagicDNS changes DNS behaviour for every device and is occasionally a precursor to wider DNS hijacking - verify the change was intentional.
- Rule type
- Scheduled
- Version
- 1.0.0
- Declared status
- Available
- Query frequency
- 15m
- Query period
- 15m
- Trigger
- gt 0
Declared MITRE coverage
Declared sources
Metadata from the source file. No dependencies inferred from KQL.
Connectors
Data types
KQL query
Original query, unchanged.
Tailscale_Audit_CL
| where Action == "UPDATE"
| where tostring(Target.type) == "TAILNET"
| where tostring(Target.property) == "MAGICDNS_PREFERENCES"
| extend ActorLogin = tostring(Actor.loginName)
| extend OldMagicDns = tobool(Old.magicDNS)
| extend NewMagicDns = tobool(New.magicDNS)
| where OldMagicDns == true and NewMagicDns == false
| project TimeGenerated, ActorLogin, OldMagicDns, NewMagicDns, Origin
Declared entities
Related content
Links established from declared identifiers and solution manifests.
Source provenance
GitHubDisplayed values come from files in Azure/Azure-Sentinel. They describe the published template, not your workspace configuration.
- Commit
9800e51↗- Source identifier
f8a9b0c1-4567-8901-23ab-cdef12345020
GSTEP / CATALOG TRACKING
Added to catalog : 16 Sept 2026 · 05:49 UTC
Last change observed : 16 Sept 2026 · 05:49 UTC