Exchange AuditLog disabled
Id | 194dd92e-d6e7-4249-85a5-273350a7f5ce |
Rulename | Exchange AuditLog disabled |
Description | Identifies when the exchange audit logging has been disabled which may be an adversary attempt to evade detection or avoid other defenses. |
Severity | Medium |
Tactics | DefenseEvasion |
Techniques | T1562 |
Required data connectors | Office365 |
Kind | Scheduled |
Query frequency | 1d |
Query period | 1d |
Trigger threshold | 0 |
Trigger operator | gt |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft 365/Analytic Rules/exchange_auditlogdisabled.yaml |
Version | 2.0.1 |
Arm template | 194dd92e-d6e7-4249-85a5-273350a7f5ce.json |
OfficeActivity
| where UserType in~ ("Admin","DcAdmin")
// Only admin or global-admin can disable audit logging
| where Operation =~ "Set-AdminAuditLogConfig"
| extend AdminAuditLogEnabledValue = tostring(parse_json(tostring(parse_json(tostring(array_slice(parse_json(Parameters),3,3)))[0])).Value)
| where AdminAuditLogEnabledValue =~ "False"
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), OperationCount = count() by Operation, UserType, UserId, ClientIP, ResultStatus, Parameters, AdminAuditLogEnabledValue
| extend timestamp = StartTimeUtc, AccountCustomEntity = UserId, IPCustomEntity = ClientIP
version: 2.0.1
status: Available
queryFrequency: 1d
requiredDataConnectors:
- connectorId: Office365
dataTypes:
- OfficeActivity
entityMappings:
- fieldMappings:
- columnName: AccountCustomEntity
identifier: FullName
entityType: Account
- fieldMappings:
- columnName: IPCustomEntity
identifier: Address
entityType: IP
kind: Scheduled
queryPeriod: 1d
severity: Medium
query: |
OfficeActivity
| where UserType in~ ("Admin","DcAdmin")
// Only admin or global-admin can disable audit logging
| where Operation =~ "Set-AdminAuditLogConfig"
| extend AdminAuditLogEnabledValue = tostring(parse_json(tostring(parse_json(tostring(array_slice(parse_json(Parameters),3,3)))[0])).Value)
| where AdminAuditLogEnabledValue =~ "False"
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), OperationCount = count() by Operation, UserType, UserId, ClientIP, ResultStatus, Parameters, AdminAuditLogEnabledValue
| extend timestamp = StartTimeUtc, AccountCustomEntity = UserId, IPCustomEntity = ClientIP
triggerOperator: gt
id: 194dd92e-d6e7-4249-85a5-273350a7f5ce
description: |
'Identifies when the exchange audit logging has been disabled which may be an adversary attempt
to evade detection or avoid other defenses.'
triggerThreshold: 0
name: Exchange AuditLog disabled
relevantTechniques:
- T1562
tactics:
- DefenseEvasion
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft 365/Analytic Rules/exchange_auditlogdisabled.yaml
{
"$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/194dd92e-d6e7-4249-85a5-273350a7f5ce')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/194dd92e-d6e7-4249-85a5-273350a7f5ce')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01",
"properties": {
"displayName": "Exchange AuditLog disabled",
"description": "'Identifies when the exchange audit logging has been disabled which may be an adversary attempt\nto evade detection or avoid other defenses.'\n",
"severity": "Medium",
"enabled": true,
"query": "OfficeActivity\n| where UserType in~ (\"Admin\",\"DcAdmin\")\n// Only admin or global-admin can disable audit logging\n| where Operation =~ \"Set-AdminAuditLogConfig\"\n| extend AdminAuditLogEnabledValue = tostring(parse_json(tostring(parse_json(tostring(array_slice(parse_json(Parameters),3,3)))[0])).Value)\n| where AdminAuditLogEnabledValue =~ \"False\"\n| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), OperationCount = count() by Operation, UserType, UserId, ClientIP, ResultStatus, Parameters, AdminAuditLogEnabledValue\n| extend timestamp = StartTimeUtc, AccountCustomEntity = UserId, IPCustomEntity = ClientIP\n",
"queryFrequency": "P1D",
"queryPeriod": "P1D",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0,
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"DefenseEvasion"
],
"techniques": [
"T1562"
],
"alertRuleTemplateName": "194dd92e-d6e7-4249-85a5-273350a7f5ce",
"customDetails": null,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"identifier": "FullName",
"columnName": "AccountCustomEntity"
}
]
},
{
"entityType": "IP",
"fieldMappings": [
{
"identifier": "Address",
"columnName": "IPCustomEntity"
}
]
}
],
"status": "Available",
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Microsoft 365/Analytic Rules/exchange_auditlogdisabled.yaml",
"templateVersion": "2.0.1"
}
}
]
}