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

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