Awake Security - High Match Counts By Device

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Id	90b7ac11-dd6c-4ba1-a99b-737061873859
Rulename	Awake Security - High Match Counts By Device
Description	This query searches for devices with unexpectedly large number of activity match.
Severity	Medium
Required data connectors	CefAma
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AristaAwakeSecurity/Analytic Rules/HighMatchCountsByDevice.yaml
Version	1.0.2
Arm template	90b7ac11-dd6c-4ba1-a99b-737061873859.json

KQL

CommonSecurityLog
| where DeviceVendor == "Arista Networks" and DeviceProduct == "Awake Security"
| summarize StartTime=min(TimeGenerated), EndTime=max(TimeGenerated), Models=make_set(Activity), ASPMatchURLs=make_set(DeviceCustomString2), SourceIPs=make_set(SourceIP),
  DestinationIPs=make_set(DestinationIP), ModelMatchCount=sum(EventCount), MaxSeverity=max(toint(LogSeverity)) by SourceHostName
| where ModelMatchCount > 1000 and MaxSeverity > 2
| extend SeverityName=iff(MaxSeverity == 0, "Informational", iff(MaxSeverity < 5, "Low", iff(MaxSeverity < 8, "Medium", "High")))

YAML

name: Awake Security - High Match Counts By Device
kind: Scheduled
tactics: []
triggerThreshold: 0
triggerOperator: gt
version: 1.0.2
status: Available
alertDetailsOverride:
  alertDisplayNameFormat: Awake Security - High Model Match Counts On Device {{SourceHostName}}
  alertDescriptionFormat: |-
    The following Awake model(s):

    {{Models}}

    matched {{ModelMatchCount}} activities, an unexpectedly large number. The destination IPs associated with these matches were:

    {{DestinationIPs}}    
  alertTacticsColumnName: 
  alertSeverityColumnName: SeverityName
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    reopenClosedIncident: true
    enabled: true
    matchingMethod: Selected
    groupByAlertDetails: []
    groupByEntities:
    - Host
    groupByCustomDetails:
    - Device
    lookbackDuration: 3d
queryFrequency: 1h
id: 90b7ac11-dd6c-4ba1-a99b-737061873859
requiredDataConnectors:
- connectorId: CefAma
  dataTypes:
  - CommonSecurityLog
eventGroupingSettings:
  aggregationKind: AlertPerResult
relevantTechniques: []
description: This query searches for devices with unexpectedly large number of activity match.
customDetails:
  Matches_Max_Severity: MaxSeverity
  Matches_ASP_URLs: ASPMatchURLs
  Matched_Models: Models
  Device: SourceHostName
  Matches_Count: ModelMatchCount
  Matches_Dest_IPs: DestinationIPs
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: SourceHostName
    identifier: HostName
- entityType: IP
  fieldMappings:
  - columnName: SourceIPs
    identifier: Address
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AristaAwakeSecurity/Analytic Rules/HighMatchCountsByDevice.yaml
queryPeriod: 1h
severity: Medium
query: |
  CommonSecurityLog
  | where DeviceVendor == "Arista Networks" and DeviceProduct == "Awake Security"
  | summarize StartTime=min(TimeGenerated), EndTime=max(TimeGenerated), Models=make_set(Activity), ASPMatchURLs=make_set(DeviceCustomString2), SourceIPs=make_set(SourceIP),
    DestinationIPs=make_set(DestinationIP), ModelMatchCount=sum(EventCount), MaxSeverity=max(toint(LogSeverity)) by SourceHostName
  | where ModelMatchCount > 1000 and MaxSeverity > 2
  | extend SeverityName=iff(MaxSeverity == 0, "Informational", iff(MaxSeverity < 5, "Low", iff(MaxSeverity < 8, "Medium", "High")))

ARM