↳ GitHub sourceAnalytics ruleHigh
Tailscale Premium: Mass fan-out from single node
Description
Identifies when a single node initiates flows to 25 or more unique destinations within a 15-minute window. Sudden fan-out is consistent with port scanning, lateral discovery, or worm-style propagation. Requires Tailscale Premium or Enterprise.
- 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.
let dstThreshold = 25;
Tailscale_Network_CL
| where TimeGenerated > ago(15m)
| where HasVirtualTraffic
| mv-expand t = VirtualTraffic
| extend Src = tostring(t.src), Dst = tostring(t.dst)
| summarize UniqueDestinations = dcount(Dst), TopDestinations = make_set(Dst, 25) by NodeId, SrcNodeName, SrcUser, SrcOs, SrcTags=tostring(SrcTags), Src
| where UniqueDestinations >= dstThreshold
| order by UniqueDestinations desc
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
f4a5b6c7-4d5e-6f7a-8b9c-0d1e2f3a4b5c
GSTEP / CATALOG TRACKING
Added to catalog : 16 Sept 2026 · 05:49 UTC
Last change observed : 16 Sept 2026 · 05:49 UTC