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Azure DevOps Service Connection Addition/Abuse - Historic allow list
Description
'This detection builds an allow list of historic service connection use by Builds and Releases and compares to recent history, flagging growth of service connection use which are not manually included in the allow list and not historically included in the allow list Build/Release runs.
This is to determine if someone is hijacking a build/release and adding many service connections in order to abuse or dump credentials from service connections.'
- Rule type
- Scheduled
- Version
- 1.0.6
- Declared status
- Available
- Query frequency
- 6h
- Query period
- 14d
- Trigger
- gt 0
Declared MITRE coverage
KQL query
Original query, unchanged.
let starttime = 14d;
let endtime = 6h;
// Ignore Build/Releases with less/equal this number
let ServiceConnectionThreshold = 3;
// New Connections need to exhibit execution of more "new" connections than this number.
let NewConnectionThreshold = 1;
// List of Builds/Releases to ignore in your space
let BypassDefIds = datatable(DefId:string, Type:string, ProjectName:string)
[
//"103", "Release", "ProjectA",
//"42", "Release", "ProjectB",
//"122", "Build", "ProjectB"
];
let HistoricDefs = ADOAuditLogs
| where TimeGenerated between (ago(starttime) .. ago(endtime))
| where OperationName == "Library.ServiceConnectionExecuted"
| extend DefId = tostring(Data.DefinitionId), Type = tostring(Data.PlanType), ConnectionId = tostring(Data.ConnectionId)
| summarize HistoricCount = dcount(tostring(ConnectionId)), ConnectionNames = make_set(tostring(Data.ConnectionName))
by DefId = tostring(DefId), Type = tostring(Type), ProjectId, ProjectName, ActorUPN;
ADOAuditLogs
| where TimeGenerated >= ago(endtime)
| where OperationName == "Library.ServiceConnectionExecuted"
| extend DefId = tostring(Data.DefinitionId), Type = tostring(Data.PlanType), ConnectionId = tostring(Data.ConnectionId)
| parse ScopeDisplayName with OrganizationName ' (Organization)'
| summarize CurrentCount = dcount(tostring(ConnectionId)), ConnectionNames = make_set(tostring(Data.ConnectionName)), StartTime = min(TimeGenerated), EndTime = max(TimeGenerated)
by OrganizationName, DefId = tostring(DefId), Type = tostring(Type), ProjectId, ProjectName, ActorUPN
| where CurrentCount > ServiceConnectionThreshold
| join (HistoricDefs) on ProjectId, DefId, Type, ActorUPN
| join kind=anti BypassDefIds on $left.DefId==$right.DefId and $left.Type == $right.Type and $left.ProjectName == $right.ProjectName
| extend link = iff(
Type == "Build", strcat('https://dev.azure.com/', OrganizationName, '/', ProjectName, '/_build?definitionId=', DefId),
strcat('https://dev.azure.com/', OrganizationName, '/', ProjectName, '/_release?_a=releases&view=mine&definitionId=', DefId))
| where CurrentCount >= HistoricCount + NewConnectionThreshold
| project StartTime, OrganizationName, ProjectName, DefId, link, RecentDistinctServiceConnections = CurrentCount, HistoricDistinctServiceConnections = HistoricCount,
RecentConnections = ConnectionNames, HistoricConnections = ConnectionNames1, ActorUPN
| extend timestamp = StartTime
| extend AccountName = tostring(split(ActorUPN, "@")[0]), AccountUPNSuffix = tostring(split(ActorUPN, "@")[1])
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
5efb0cfd-063d-417a-803b-562eae5b0301
GSTEP / CATALOG TRACKING
Added to catalog : 16 Sept 2026 · 05:49 UTC
Last change observed : 16 Sept 2026 · 05:49 UTC