Awake Security - High Match Counts By Device

Back


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

relevantTechniques: []
entityMappings:
- fieldMappings:
  - columnName: SourceHostName
    identifier: HostName
  entityType: Host
- fieldMappings:
  - columnName: SourceIPs
    identifier: Address
  entityType: IP
incidentConfiguration:
  groupingConfiguration:
    groupByCustomDetails:
    - Device
    reopenClosedIncident: true
    enabled: true
    matchingMethod: Selected
    groupByEntities:
    - Host
    lookbackDuration: 3d
    groupByAlertDetails: []
  createIncident: true
version: 1.0.2
triggerThreshold: 0
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/AristaAwakeSecurity/Analytic Rules/HighMatchCountsByDevice.yaml
description: This query searches for devices with unexpectedly large number of activity match.
customDetails:
  Matches_Count: ModelMatchCount
  Matches_ASP_URLs: ASPMatchURLs
  Device: SourceHostName
  Matched_Models: Models
  Matches_Max_Severity: MaxSeverity
  Matches_Dest_IPs: DestinationIPs
requiredDataConnectors:
- connectorId: CefAma
  dataTypes:
  - CommonSecurityLog
triggerOperator: gt
alertDetailsOverride:
  alertTacticsColumnName: 
  alertDisplayNameFormat: Awake Security - High Model Match Counts On Device {{SourceHostName}}
  alertSeverityColumnName: SeverityName
  alertDescriptionFormat: |-
    The following Awake model(s):

    {{Models}}

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

    {{DestinationIPs}}    
eventGroupingSettings:
  aggregationKind: AlertPerResult
id: 90b7ac11-dd6c-4ba1-a99b-737061873859
queryFrequency: 1h
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")))  
severity: Medium
status: Available
queryPeriod: 1h
name: Awake Security - High Match Counts By Device
tactics: []
kind: Scheduled

ARM