↳ GitHub sourceAnalytics ruleMedium
Suspicious Sign In by Entra ID Connect Sync Account
Description
'This query looks for sign ins by the Microsoft Entra ID Connect Sync account to Azure where properties about the logon are anomalous.
This query uses Microsoft Sentinel's UEBA features to detect these suspicious properties.
A threat actor may attempt to steal the Sync account credentials and use them to access Azure resources. This alert should be
reviewed to ensure that the log in came was from a legitimate source.'
- Rule type
- Scheduled
- Version
- 1.0.3
- Declared status
- Available
- Query frequency
- 1h
- Query period
- 1h
- 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.
BehaviorAnalytics
// User modification is expected from this account so focus on logons
| where ActivityType =~ "LogOn"
| where UserName startswith "Sync_" and UsersInsights.AccountDisplayName =~ "On-Premises Directory Synchronization Service Account"
// Filter out this expected activity
| where ActivityInsights.App !~ "Microsoft Azure Active Directory Connect"
| where InvestigationPriority > 0
| extend Name = split(UserPrincipalName, "@")[0], UPNSuffix = split(UserPrincipalName, "@")[1]
Declared entities
Source provenance
GitHubDisplayed values come from files in Azure/Azure-Sentinel. They describe the published template, not your workspace configuration.
- Commit
9800e51↗- Source identifier
2cd8b3d5-c9e0-4be3-80f7-0469d511c3f6
Additional source files 1
Detections/BehaviorAnalytics/SuspiciousSigninByAADConnectAccount.yamlsource ↗GSTEP / CATALOG TRACKING
Added to catalog : 16 Sept 2026 · 05:49 UTC
Last change observed : 16 Sept 2026 · 05:49 UTC