Security Event log cleared
Id | 80da0a8f-cfe1-4cd0-a895-8bc1771a720e |
Rulename | Security Event log cleared |
Description | Checks for event id 1102 which indicates the security event log was cleared. It uses Event Source Name “Microsoft-Windows-Eventlog” to avoid generating false positives from other sources, like AD FS servers for instance. |
Severity | Medium |
Tactics | DefenseEvasion |
Techniques | T1070 |
Required data connectors | SecurityEvents WindowsForwardedEvents WindowsSecurityEvents |
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/Endpoint Threat Protection Essentials/Analytic Rules/SecurityEventLogCleared.yaml |
Version | 1.1.2 |
Arm template | 80da0a8f-cfe1-4cd0-a895-8bc1771a720e.json |
(union isfuzzy=true
(
SecurityEvent
| where EventID == 1102 and EventSourceName == "Microsoft-Windows-Eventlog"
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), EventCount = count() by Computer, Account, EventID, Activity
| extend timestamp = StartTimeUtc, AccountCustomEntity = Account, HostCustomEntity = Computer
),
(
WindowsEvent
| where EventID == 1102 and Provider == "Microsoft-Windows-Eventlog"
| extend Account = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend Activity= "1102 - The audit log was cleared."
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), EventCount = count() by Computer, Account, EventID, Activity
| extend timestamp = StartTimeUtc, AccountCustomEntity = Account, HostCustomEntity = Computer
)
)
tactics:
- DefenseEvasion
severity: Medium
requiredDataConnectors:
- connectorId: SecurityEvents
dataTypes:
- SecurityEvent
- connectorId: WindowsSecurityEvents
dataTypes:
- SecurityEvent
- connectorId: WindowsForwardedEvents
dataTypes:
- WindowsEvent
triggerOperator: gt
query: |
(union isfuzzy=true
(
SecurityEvent
| where EventID == 1102 and EventSourceName == "Microsoft-Windows-Eventlog"
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), EventCount = count() by Computer, Account, EventID, Activity
| extend timestamp = StartTimeUtc, AccountCustomEntity = Account, HostCustomEntity = Computer
),
(
WindowsEvent
| where EventID == 1102 and Provider == "Microsoft-Windows-Eventlog"
| extend Account = strcat(tostring(EventData.SubjectDomainName),"\\", tostring(EventData.SubjectUserName))
| extend Activity= "1102 - The audit log was cleared."
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), EventCount = count() by Computer, Account, EventID, Activity
| extend timestamp = StartTimeUtc, AccountCustomEntity = Account, HostCustomEntity = Computer
)
)
triggerThreshold: 0
name: Security Event log cleared
kind: Scheduled
version: 1.1.2
relevantTechniques:
- T1070
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Endpoint Threat Protection Essentials/Analytic Rules/SecurityEventLogCleared.yaml
description: |
'Checks for event id 1102 which indicates the security event log was cleared.
It uses Event Source Name "Microsoft-Windows-Eventlog" to avoid generating false positives from other sources, like AD FS servers for instance.'
status: Available
queryFrequency: 1d
queryPeriod: 1d
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: AccountCustomEntity
- entityType: Host
fieldMappings:
- identifier: FullName
columnName: HostCustomEntity
id: 80da0a8f-cfe1-4cd0-a895-8bc1771a720e
{
"$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/80da0a8f-cfe1-4cd0-a895-8bc1771a720e')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/80da0a8f-cfe1-4cd0-a895-8bc1771a720e')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Scheduled",
"apiVersion": "2022-11-01",
"properties": {
"displayName": "Security Event log cleared",
"description": "'Checks for event id 1102 which indicates the security event log was cleared.\nIt uses Event Source Name \"Microsoft-Windows-Eventlog\" to avoid generating false positives from other sources, like AD FS servers for instance.'\n",
"severity": "Medium",
"enabled": true,
"query": "(union isfuzzy=true\n(\nSecurityEvent\n| where EventID == 1102 and EventSourceName == \"Microsoft-Windows-Eventlog\"\n| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), EventCount = count() by Computer, Account, EventID, Activity\n| extend timestamp = StartTimeUtc, AccountCustomEntity = Account, HostCustomEntity = Computer\n),\n(\nWindowsEvent\n| where EventID == 1102 and Provider == \"Microsoft-Windows-Eventlog\"\n| extend Account = strcat(tostring(EventData.SubjectDomainName),\"\\\\\", tostring(EventData.SubjectUserName))\n| extend Activity= \"1102 - The audit log was cleared.\"\n| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated), EventCount = count() by Computer, Account, EventID, Activity\n| extend timestamp = StartTimeUtc, AccountCustomEntity = Account, HostCustomEntity = Computer\n)\n)\n",
"queryFrequency": "P1D",
"queryPeriod": "P1D",
"triggerOperator": "GreaterThan",
"triggerThreshold": 0,
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"DefenseEvasion"
],
"techniques": [
"T1070"
],
"alertRuleTemplateName": "80da0a8f-cfe1-4cd0-a895-8bc1771a720e",
"customDetails": null,
"entityMappings": [
{
"fieldMappings": [
{
"columnName": "AccountCustomEntity",
"identifier": "FullName"
}
],
"entityType": "Account"
},
{
"fieldMappings": [
{
"columnName": "HostCustomEntity",
"identifier": "FullName"
}
],
"entityType": "Host"
}
],
"status": "Available",
"templateVersion": "1.1.2",
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Endpoint Threat Protection Essentials/Analytic Rules/SecurityEventLogCleared.yaml"
}
}
]
}