Unusual Volume of Password Updated or Removed

let threshold = toscalar (LastPassNativePoller_CL
| where todatetime(Time_s) >= startofday(ago(14d)) and todatetime(Time_s) < startofday(ago(1d))
| where Action_s == "Site Changed" or Action_s == "Deleted Sites" 
| summarize count() by Username_s, bin(todatetime(Time_s),1d)
| summarize avg(count_), stdev(count_)
| project threshold = avg_count_+stdev_count_*2);
LastPassNativePoller_CL
| where Username_s != "API"
| where Action_s == "Site Changed" or Action_s == "Deleted Sites" and todatetime(Time_s) >= startofday(ago(1d))
| summarize count() by Username_s, IP_Address_s
| where count_ > ['threshold']
| extend AccountCustomEntity = Username_s, IPCustomEntity = IP_Address_s

description: |
  'This rule will check if there is an unnormal activity of sites that are deleted or changed per user.
   The normal amount of actions is calculated based on the previous 14 days of activity. If there is a significant increase, an incident will be created.'  
tactics:
- Impact
requiredDataConnectors:
- connectorId: LastPass
  dataTypes:
  - LastPassNativePoller_CL
version: 1.0.0
relevantTechniques:
- T1485
eventGroupingSettings:
  aggregationKind: AlertPerResult
id: a3bbdf60-0a6d-4cc2-b1d1-dd70aca184ce
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/LastPass/Analytic Rules/UnusualVolumeOfPasswordsUpdatedOrRemoved.yaml
severity: Low
entityMappings:
- fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
  entityType: Account
- fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
  entityType: IP
triggerThreshold: 0
queryFrequency: 1d
status: Available
queryPeriod: 14d
triggerOperator: gt
kind: Scheduled
query: |
  let threshold = toscalar (LastPassNativePoller_CL
  | where todatetime(Time_s) >= startofday(ago(14d)) and todatetime(Time_s) < startofday(ago(1d))
  | where Action_s == "Site Changed" or Action_s == "Deleted Sites" 
  | summarize count() by Username_s, bin(todatetime(Time_s),1d)
  | summarize avg(count_), stdev(count_)
  | project threshold = avg_count_+stdev_count_*2);
  LastPassNativePoller_CL
  | where Username_s != "API"
  | where Action_s == "Site Changed" or Action_s == "Deleted Sites" and todatetime(Time_s) >= startofday(ago(1d))
  | summarize count() by Username_s, IP_Address_s
  | where count_ > ['threshold']
  | extend AccountCustomEntity = Username_s, IPCustomEntity = IP_Address_s  
name: Unusual Volume of Password Updated or Removed

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2024-01-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/a3bbdf60-0a6d-4cc2-b1d1-dd70aca184ce')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a3bbdf60-0a6d-4cc2-b1d1-dd70aca184ce')]",
      "properties": {
        "alertRuleTemplateName": "a3bbdf60-0a6d-4cc2-b1d1-dd70aca184ce",
        "customDetails": null,
        "description": "'This rule will check if there is an unnormal activity of sites that are deleted or changed per user.\n The normal amount of actions is calculated based on the previous 14 days of activity. If there is a significant increase, an incident will be created.'\n",
        "displayName": "Unusual Volume of Password Updated or Removed",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "Name"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/LastPass/Analytic Rules/UnusualVolumeOfPasswordsUpdatedOrRemoved.yaml",
        "query": "let threshold = toscalar (LastPassNativePoller_CL\n| where todatetime(Time_s) >= startofday(ago(14d)) and todatetime(Time_s) < startofday(ago(1d))\n| where Action_s == \"Site Changed\" or Action_s == \"Deleted Sites\" \n| summarize count() by Username_s, bin(todatetime(Time_s),1d)\n| summarize avg(count_), stdev(count_)\n| project threshold = avg_count_+stdev_count_*2);\nLastPassNativePoller_CL\n| where Username_s != \"API\"\n| where Action_s == \"Site Changed\" or Action_s == \"Deleted Sites\" and todatetime(Time_s) >= startofday(ago(1d))\n| summarize count() by Username_s, IP_Address_s\n| where count_ > ['threshold']\n| extend AccountCustomEntity = Username_s, IPCustomEntity = IP_Address_s\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P14D",
        "severity": "Low",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1485"
        ],
        "templateVersion": "1.0.0",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}