SlackAudit - User email linked to account changed

SlackAudit
| where TimeGenerated between (ago(14d) .. (1d))
| summarize max(TimeGenerated) by SrcUserName, SrcUserEmail
| join (SlackAudit 
      | where Action =~ 'user_login'
      | project SrcIpAddr, SrcUserName, NewUserEmail = SrcUserEmail) on SrcUserName
| where NewUserEmail != SrcUserEmail
| extend AccountCustomEntity = SrcUserName
| extend IPCustomEntity = SrcIpAddr

entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: FullName
    columnName: AccountCustomEntity
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: IPCustomEntity
name: SlackAudit - User email linked to account changed.
kind: Scheduled
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/SlackAudit/Analytic%20Rules/SlackAuditUserEmailChanged.yaml
triggerOperator: gt
status: Available
queryPeriod: 14d
requiredDataConnectors:
- connectorId: SlackAuditAPI
  dataTypes:
  - SlackAudit_CL
tactics:
- InitialAccess
query: |
  SlackAudit
  | where TimeGenerated between (ago(14d) .. (1d))
  | summarize max(TimeGenerated) by SrcUserName, SrcUserEmail
  | join (SlackAudit 
        | where Action =~ 'user_login'
        | project SrcIpAddr, SrcUserName, NewUserEmail = SrcUserEmail) on SrcUserName
  | where NewUserEmail != SrcUserEmail
  | extend AccountCustomEntity = SrcUserName
  | extend IPCustomEntity = SrcIpAddr
description: |
  'Detects when user email linked to account changes.'
severity: Medium
id: 9d85feb3-7f54-4181-b143-68abb1a86823
customDetails:
  SourceIpAddress: SrcIpAddr
  NewUserEmail: NewUserEmail
  OriginalUserEmail: SrcUserEmail
  SourceUserName: SrcUserName
triggerThreshold: 0
queryFrequency: 1h
alertDetailsOverride:
  alertDescriptionFormat: Slack audit detected a user email change for {{SrcUserName}} from {{SrcUserEmail}} to {{NewUserEmail}}.
  alertDisplayNameFormat: Slack user email changed for {{SrcUserName}}
version: 1.0.1
relevantTechniques:
- T1078

{
  "$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/9d85feb3-7f54-4181-b143-68abb1a86823')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/9d85feb3-7f54-4181-b143-68abb1a86823')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "Slack audit detected a user email change for {{SrcUserName}} from {{SrcUserEmail}} to {{NewUserEmail}}.",
          "alertDisplayNameFormat": "Slack user email changed for {{SrcUserName}}"
        },
        "alertRuleTemplateName": "9d85feb3-7f54-4181-b143-68abb1a86823",
        "customDetails": {
          "NewUserEmail": "NewUserEmail",
          "OriginalUserEmail": "SrcUserEmail",
          "SourceIpAddress": "SrcIpAddr",
          "SourceUserName": "SrcUserName"
        },
        "description": "'Detects when user email linked to account changes.'\n",
        "displayName": "SlackAudit - User email linked to account changed.",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountCustomEntity",
                "identifier": "FullName"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "IPCustomEntity",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/SlackAudit/Analytic%20Rules/SlackAuditUserEmailChanged.yaml",
        "query": "SlackAudit\n| where TimeGenerated between (ago(14d) .. (1d))\n| summarize max(TimeGenerated) by SrcUserName, SrcUserEmail\n| join (SlackAudit \n      | where Action =~ 'user_login'\n      | project SrcIpAddr, SrcUserName, NewUserEmail = SrcUserEmail) on SrcUserName\n| where NewUserEmail != SrcUserEmail\n| extend AccountCustomEntity = SrcUserName\n| extend IPCustomEntity = SrcIpAddr\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "P14D",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "InitialAccess"
        ],
        "techniques": [
          "T1078"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}