↳ GitHub sourceAnalytics ruleMedium
Tailscale: External (shared-in) device added
Description
Identifies new external (shared-in) devices joining the tailnet that were not present in the prior 24-hour baseline. Each shared-in device expands the trust boundary - confirm the share matches a documented agreement and ACL scope.
- Rule type
- Scheduled
- Version
- 1.0.0
- Declared status
- Available
- Query frequency
- 1h
- Query period
- 2d
- 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.
let recent =
Tailscale_Devices_CL
| where TimeGenerated > ago(1h)
| summarize arg_max(TimeGenerated, *) by DeviceId
| where IsExternal == true
| project DeviceId, DeviceName, Hostname, User, Os, ClientVersion, Created, LastSeen, Tags;
let prior =
Tailscale_Devices_CL
| where TimeGenerated between (ago(2d) .. ago(1h))
| summarize arg_max(TimeGenerated, *) by DeviceId
| where IsExternal == true
| distinct DeviceId;
recent
| join kind=leftanti prior on DeviceId
| project TimeGenerated = now(), DeviceName, Hostname, User, Os, ClientVersion, Created, LastSeen, Tags
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
b2c3d4e5-6789-0123-4567-890123450043
GSTEP / CATALOG TRACKING
Added to catalog : 16 Sept 2026 · 05:49 UTC
Last change observed : 16 Sept 2026 · 05:49 UTC