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

tactics: []
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AristaAwakeSecurity/Analytic Rules/HighMatchCountsByDevice.yaml
customDetails:
  Matches_Dest_IPs: DestinationIPs
  Device: SourceHostName
  Matches_Count: ModelMatchCount
  Matches_Max_Severity: MaxSeverity
  Matched_Models: Models
  Matches_ASP_URLs: ASPMatchURLs
version: 1.0.2
requiredDataConnectors:
- dataTypes:
  - CommonSecurityLog
  connectorId: CefAma
id: 90b7ac11-dd6c-4ba1-a99b-737061873859
severity: Medium
triggerOperator: gt
triggerThreshold: 0
queryFrequency: 1h
name: Awake Security - High Match Counts By Device
incidentConfiguration:
  createIncident: true
  groupingConfiguration:
    groupByCustomDetails:
    - Device
    groupByAlertDetails: []
    matchingMethod: Selected
    lookbackDuration: 3d
    reopenClosedIncident: true
    enabled: true
    groupByEntities:
    - Host
queryPeriod: 1h
entityMappings:
- entityType: Host
  fieldMappings:
  - columnName: SourceHostName
    identifier: HostName
- entityType: IP
  fieldMappings:
  - columnName: SourceIPs
    identifier: Address
description: This query searches for devices with unexpectedly large number of activity match.
eventGroupingSettings:
  aggregationKind: AlertPerResult
relevantTechniques: []
alertDetailsOverride:
  alertSeverityColumnName: SeverityName
  alertTacticsColumnName: 
  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}}    
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")))  
kind: Scheduled
status: Available

ARM