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

triggerOperator: gt
id: a3bbdf60-0a6d-4cc2-b1d1-dd70aca184ce
queryFrequency: 1d
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountCustomEntity
    identifier: Name
- entityType: IP
  fieldMappings:
  - columnName: IPCustomEntity
    identifier: Address
requiredDataConnectors:
- dataTypes:
  - LastPassNativePoller_CL
  connectorId: LastPass
severity: Low
eventGroupingSettings:
  aggregationKind: AlertPerResult
kind: Scheduled
status: Available
queryPeriod: 14d
triggerThreshold: 0
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  
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.'  
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/LastPass/Analytic Rules/UnusualVolumeOfPasswordsUpdatedOrRemoved.yaml
name: Unusual Volume of Password Updated or Removed
relevantTechniques:
- T1485
tactics:
- Impact
version: 1.0.0

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/a3bbdf60-0a6d-4cc2-b1d1-dd70aca184ce')]",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/a3bbdf60-0a6d-4cc2-b1d1-dd70aca184ce')]",
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
      "kind": "Scheduled",
      "apiVersion": "2022-11-01",
      "properties": {
        "displayName": "Unusual Volume of Password Updated or Removed",
        "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",
        "severity": "Low",
        "enabled": true,
        "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",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0,
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Impact"
        ],
        "techniques": [
          "T1485"
        ],
        "alertRuleTemplateName": "a3bbdf60-0a6d-4cc2-b1d1-dd70aca184ce",
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "customDetails": null,
        "entityMappings": [
          {
            "fieldMappings": [
              {
                "identifier": "Name",
                "columnName": "AccountCustomEntity"
              }
            ],
            "entityType": "Account"
          },
          {
            "fieldMappings": [
              {
                "identifier": "Address",
                "columnName": "IPCustomEntity"
              }
            ],
            "entityType": "IP"
          }
        ],
        "templateVersion": "1.0.0",
        "status": "Available",
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/LastPass/Analytic Rules/UnusualVolumeOfPasswordsUpdatedOrRemoved.yaml"
      }
    }
  ]
}