Insider Risk_High User Security Incidents Correlation

Back


Id	28a75d10-9b75-4192-9863-e452c3ad24db
Rulename	Insider Risk_High User Security Incidents Correlation
Description	This alert joins SecurityAlerts to SecurityIncidents to associate Security Alerts and Incidents with user accounts. This aligns all Microsoft Alerting Products with Microsoft Incident Generating Products (Microsoft Sentinel, M365 Defender) for a count of user security incidents over time. The default threshold is 5 security incidents, and this is customizable per the organization’s requirements. Results include UserPrincipalName (UPN), SecurityIncident, LastIncident, ProductName, LastObservedTime, and Previous Incidents. There is an option for configuration of correlations against Microsoft Sentinel watchlists. For more information, see Investigate incidents with Microsoft Sentinel.
Severity	High
Tactics	Execution
Techniques	T1204
Required data connectors	AzureActiveDirectoryIdentityProtection AzureSecurityCenter IoT MicrosoftCloudAppSecurity MicrosoftDefenderAdvancedThreatProtection OfficeATP
Kind	Scheduled
Query frequency	7d
Query period	7d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MicrosoftPurviewInsiderRiskManagement/Analytic Rules/InsiderRiskHighUserIncidentsCorrelation.yaml
Version	1.1.2
Arm template	28a75d10-9b75-4192-9863-e452c3ad24db.json

KQL

let PreviousIncidents =
SecurityIncident
| summarize hint.strategy = shuffle arg_max(LastModifiedTime, *) by IncidentNumber
| mv-expand AlertIds
| extend AlertId = tostring(AlertIds)
| join kind= innerunique ( 
          SecurityAlert 
          )
          on $left.AlertId == $right.SystemAlertId
| summarize hint.strategy = shuffle arg_max(TimeGenerated, *), NumberOfUpdates = count() by SystemAlertId
| mv-expand todynamic(Entities)
| where Entities["Type"] =~ "account"
| extend Name = tostring(tolower(Entities["Name"])), NTDomain = tostring(Entities["NTDomain"]), UPNSuffix = tostring(Entities["UPNSuffix"]), AadUserId = tostring(Entities["AadUserId"]), AadTenantId = tostring(Entities["AadTenantId"]), 
          Sid = tostring(Entities["Sid"]), IsDomainJoined = tobool(Entities["IsDomainJoined"]), Host = tostring(Entities["Host"])
| extend UPN = iff(Name != "" and UPNSuffix != "", strcat(Name, "@", UPNSuffix), "")
| extend Href_ = tostring(parse_json(ExtendedLinks)[0].Href)
| where UPN <> ""
| summarize PreviousIncidents = make_set(IncidentNumber) by UPN;
let LastTimeObserved =
SecurityIncident
| summarize hint.strategy = shuffle arg_max(LastModifiedTime, *) by IncidentNumber
| mv-expand AlertIds
| extend AlertId = tostring(AlertIds)
| join kind= innerunique ( 
          SecurityAlert 
          )
          on $left.AlertId == $right.SystemAlertId
| summarize hint.strategy = shuffle arg_max(TimeGenerated, *), NumberOfUpdates = count() by SystemAlertId
| mv-expand todynamic(Entities)
| where Entities["Type"] =~ "account"
| extend Name = tostring(tolower(Entities["Name"])), NTDomain = tostring(Entities["NTDomain"]), UPNSuffix = tostring(Entities["UPNSuffix"]), AadUserId = tostring(Entities["AadUserId"]), AadTenantId = tostring(Entities["AadTenantId"]), 
          Sid = tostring(Entities["Sid"]), IsDomainJoined = tobool(Entities["IsDomainJoined"]), Host = tostring(Entities["Host"])
| extend UPN = iff(Name != "" and UPNSuffix != "", strcat(Name, "@", UPNSuffix), "")
| extend Href_ = tostring(parse_json(ExtendedLinks)[0].Href)
| where UPN <> ""
| summarize arg_max(TimeGenerated, IncidentName) by UPN;
  SecurityIncident
| summarize hint.strategy = shuffle arg_max(LastModifiedTime, *) by IncidentNumber
| mv-expand AlertIds
| extend AlertId = tostring(AlertIds)
| join kind= innerunique ( 
          SecurityAlert 
          )
          on $left.AlertId == $right.SystemAlertId
| summarize hint.strategy = shuffle arg_max(TimeGenerated, *), NumberOfUpdates = count() by SystemAlertId
| mv-expand todynamic(Entities)
| where Entities["Type"] =~ "account"
| extend Name = tostring(tolower(Entities["Name"])), NTDomain = tostring(Entities["NTDomain"]), UPNSuffix = tostring(Entities["UPNSuffix"]), AadUserId = tostring(Entities["AadUserId"]), AadTenantId = tostring(Entities["AadTenantId"]), 
          Sid = tostring(Entities["Sid"]), IsDomainJoined = tobool(Entities["IsDomainJoined"]), Host = tostring(Entities["Host"])
| extend UPN = iff(Name != "" and UPNSuffix != "", strcat(Name, "@", UPNSuffix), "")
| extend Href_ = tostring(parse_json(ExtendedLinks)[0].Href)
| where UPN <> ""
| summarize count() by UPN, IncidentName, IncidentNumber, IncidentUrl, Severity, ProductName
| extend SecurityIncidents = count_
| where SecurityIncidents > 5 //Adjust & Tune within Organzational Requirements
| join (LastTimeObserved) on UPN
| project-rename LastObserved = TimeGenerated, LastIncident = IncidentNumber
| project-away IncidentName, count_, UPN1, IncidentName1, Severity, IncidentUrl
| join kind=inner (PreviousIncidents) on UPN
// | lookup kind=inner _GetWatchlist('<Your Watchlist Name>') on $left.UPN == $right.SearchKey
| project UPN, SecurityIncidents, LastIncident, ProductName, LastObserved, PreviousIncidents
| sort by SecurityIncidents desc
| extend AccountName = tostring(split(UPN, "@")[0]), AccountUPNSuffix = tostring(split(UPN, "@")[1])

YAML

relevantTechniques:
- T1204
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: UPN
    identifier: FullName
  - columnName: AccountName
    identifier: Name
  - columnName: AccountUPNSuffix
    identifier: UPNSuffix
eventGroupingSettings:
  aggregationKind: SingleAlert
version: 1.1.2
id: 28a75d10-9b75-4192-9863-e452c3ad24db
severity: High
kind: Scheduled
queryFrequency: 7d
description: |
    'This alert joins SecurityAlerts to SecurityIncidents to associate Security Alerts and Incidents with user accounts. This aligns all Microsoft Alerting Products with Microsoft Incident Generating Products (Microsoft Sentinel, M365 Defender) for a count of user security incidents over time. The default threshold is 5 security incidents, and this is customizable per the organization's requirements. Results include UserPrincipalName (UPN), SecurityIncident, LastIncident, ProductName, LastObservedTime, and Previous Incidents. There is an option for configuration of correlations against Microsoft Sentinel watchlists. For more information, see [Investigate incidents with Microsoft Sentinel]( https://docs.microsoft.com/azure/sentinel/investigate-cases).'
requiredDataConnectors:
- connectorId: MicrosoftDefenderAdvancedThreatProtection
  dataTypes:
  - SecurityAlert (MDATP)
- connectorId: AzureActiveDirectoryIdentityProtection
  dataTypes:
  - SecurityAlert (IPC)
- connectorId: AzureSecurityCenter
  dataTypes:
  - SecurityAlert (ASC)
- connectorId: IoT
  dataTypes:
  - SecurityAlert (ASC for IoT)
- connectorId: MicrosoftCloudAppSecurity
  dataTypes:
  - SecurityAlert (ASC for IoT)
- connectorId: IoT
  dataTypes:
  - SecurityAlert (MCAS)
- connectorId: OfficeATP
  dataTypes:
  - SecurityAlert (Office 365)
triggerOperator: gt
name: Insider Risk_High User Security Incidents Correlation
tactics:
- Execution
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/MicrosoftPurviewInsiderRiskManagement/Analytic Rules/InsiderRiskHighUserIncidentsCorrelation.yaml
triggerThreshold: 0
queryPeriod: 7d
query: |
  let PreviousIncidents =
  SecurityIncident
  | summarize hint.strategy = shuffle arg_max(LastModifiedTime, *) by IncidentNumber
  | mv-expand AlertIds
  | extend AlertId = tostring(AlertIds)
  | join kind= innerunique ( 
            SecurityAlert 
            )
            on $left.AlertId == $right.SystemAlertId
  | summarize hint.strategy = shuffle arg_max(TimeGenerated, *), NumberOfUpdates = count() by SystemAlertId
  | mv-expand todynamic(Entities)
  | where Entities["Type"] =~ "account"
  | extend Name = tostring(tolower(Entities["Name"])), NTDomain = tostring(Entities["NTDomain"]), UPNSuffix = tostring(Entities["UPNSuffix"]), AadUserId = tostring(Entities["AadUserId"]), AadTenantId = tostring(Entities["AadTenantId"]), 
            Sid = tostring(Entities["Sid"]), IsDomainJoined = tobool(Entities["IsDomainJoined"]), Host = tostring(Entities["Host"])
  | extend UPN = iff(Name != "" and UPNSuffix != "", strcat(Name, "@", UPNSuffix), "")
  | extend Href_ = tostring(parse_json(ExtendedLinks)[0].Href)
  | where UPN <> ""
  | summarize PreviousIncidents = make_set(IncidentNumber) by UPN;
  let LastTimeObserved =
  SecurityIncident
  | summarize hint.strategy = shuffle arg_max(LastModifiedTime, *) by IncidentNumber
  | mv-expand AlertIds
  | extend AlertId = tostring(AlertIds)
  | join kind= innerunique ( 
            SecurityAlert 
            )
            on $left.AlertId == $right.SystemAlertId
  | summarize hint.strategy = shuffle arg_max(TimeGenerated, *), NumberOfUpdates = count() by SystemAlertId
  | mv-expand todynamic(Entities)
  | where Entities["Type"] =~ "account"
  | extend Name = tostring(tolower(Entities["Name"])), NTDomain = tostring(Entities["NTDomain"]), UPNSuffix = tostring(Entities["UPNSuffix"]), AadUserId = tostring(Entities["AadUserId"]), AadTenantId = tostring(Entities["AadTenantId"]), 
            Sid = tostring(Entities["Sid"]), IsDomainJoined = tobool(Entities["IsDomainJoined"]), Host = tostring(Entities["Host"])
  | extend UPN = iff(Name != "" and UPNSuffix != "", strcat(Name, "@", UPNSuffix), "")
  | extend Href_ = tostring(parse_json(ExtendedLinks)[0].Href)
  | where UPN <> ""
  | summarize arg_max(TimeGenerated, IncidentName) by UPN;
    SecurityIncident
  | summarize hint.strategy = shuffle arg_max(LastModifiedTime, *) by IncidentNumber
  | mv-expand AlertIds
  | extend AlertId = tostring(AlertIds)
  | join kind= innerunique ( 
            SecurityAlert 
            )
            on $left.AlertId == $right.SystemAlertId
  | summarize hint.strategy = shuffle arg_max(TimeGenerated, *), NumberOfUpdates = count() by SystemAlertId
  | mv-expand todynamic(Entities)
  | where Entities["Type"] =~ "account"
  | extend Name = tostring(tolower(Entities["Name"])), NTDomain = tostring(Entities["NTDomain"]), UPNSuffix = tostring(Entities["UPNSuffix"]), AadUserId = tostring(Entities["AadUserId"]), AadTenantId = tostring(Entities["AadTenantId"]), 
            Sid = tostring(Entities["Sid"]), IsDomainJoined = tobool(Entities["IsDomainJoined"]), Host = tostring(Entities["Host"])
  | extend UPN = iff(Name != "" and UPNSuffix != "", strcat(Name, "@", UPNSuffix), "")
  | extend Href_ = tostring(parse_json(ExtendedLinks)[0].Href)
  | where UPN <> ""
  | summarize count() by UPN, IncidentName, IncidentNumber, IncidentUrl, Severity, ProductName
  | extend SecurityIncidents = count_
  | where SecurityIncidents > 5 //Adjust & Tune within Organzational Requirements
  | join (LastTimeObserved) on UPN
  | project-rename LastObserved = TimeGenerated, LastIncident = IncidentNumber
  | project-away IncidentName, count_, UPN1, IncidentName1, Severity, IncidentUrl
  | join kind=inner (PreviousIncidents) on UPN
  // | lookup kind=inner _GetWatchlist('<Your Watchlist Name>') on $left.UPN == $right.SearchKey
  | project UPN, SecurityIncidents, LastIncident, ProductName, LastObserved, PreviousIncidents
  | sort by SecurityIncidents desc
  | extend AccountName = tostring(split(UPN, "@")[0]), AccountUPNSuffix = tostring(split(UPN, "@")[1])  
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    matchingMethod: Selected
    groupByEntities:
    - Account
    reopenClosedIncident: true
    enabled: true
    lookbackDuration: 3d

ARM