NRT Base64 encoded Windows process command-lines
Id | c3e5dbaa-a540-408c-8b36-68bdfb3df088 |
Rulename | NRT Base64 encoded Windows process command-lines |
Description | Identifies instances of a base64 encoded PE file header seen in the process command line parameter. |
Severity | Medium |
Tactics | Execution DefenseEvasion |
Techniques | T1059 T1027 T1140 |
Required data connectors | SecurityEvents WindowsSecurityEvents |
Kind | NRT |
Source Uri | https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Windows Security Events/Analytic Rules/NRT_base64_encoded_pefile.yaml |
Version | 1.0.0 |
Arm template | c3e5dbaa-a540-408c-8b36-68bdfb3df088.json |
SecurityEvent
| where EventID==4688
| where isnotempty(CommandLine)
| where CommandLine contains "TVqQAAMAAAAEAAA"
description: |
'Identifies instances of a base64 encoded PE file header seen in the process command line parameter.'
name: NRT Base64 encoded Windows process command-lines
tactics:
- Execution
- DefenseEvasion
status: Available
relevantTechniques:
- T1059
- T1027
- T1140
query: |
SecurityEvent
| where EventID==4688
| where isnotempty(CommandLine)
| where CommandLine contains "TVqQAAMAAAAEAAA"
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Windows Security Events/Analytic Rules/NRT_base64_encoded_pefile.yaml
severity: Medium
version: 1.0.0
entityMappings:
- entityType: Account
fieldMappings:
- identifier: FullName
columnName: Account
- entityType: Host
fieldMappings:
- identifier: FullName
columnName: Computer
id: c3e5dbaa-a540-408c-8b36-68bdfb3df088
requiredDataConnectors:
- connectorId: SecurityEvents
dataTypes:
- SecurityEvent
- connectorId: WindowsSecurityEvents
dataTypes:
- SecurityEvent
kind: NRT
{
"$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/c3e5dbaa-a540-408c-8b36-68bdfb3df088')]",
"name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/c3e5dbaa-a540-408c-8b36-68bdfb3df088')]",
"type": "Microsoft.OperationalInsights/workspaces/providers/alertRules",
"kind": "Nrt",
"apiVersion": "2022-11-01",
"properties": {
"displayName": "NRT Base64 encoded Windows process command-lines",
"description": "'Identifies instances of a base64 encoded PE file header seen in the process command line parameter.'\n",
"severity": "Medium",
"enabled": true,
"query": "SecurityEvent\n | where EventID==4688\n | where isnotempty(CommandLine)\n | where CommandLine contains \"TVqQAAMAAAAEAAA\"\n",
"suppressionDuration": "PT1H",
"suppressionEnabled": false,
"tactics": [
"Execution",
"DefenseEvasion"
],
"techniques": [
"T1059",
"T1027",
"T1140"
],
"alertRuleTemplateName": "c3e5dbaa-a540-408c-8b36-68bdfb3df088",
"customDetails": null,
"entityMappings": [
{
"entityType": "Account",
"fieldMappings": [
{
"identifier": "FullName",
"columnName": "Account"
}
]
},
{
"entityType": "Host",
"fieldMappings": [
{
"identifier": "FullName",
"columnName": "Computer"
}
]
}
],
"status": "Available",
"OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Windows Security Events/Analytic Rules/NRT_base64_encoded_pefile.yaml",
"templateVersion": "1.0.0"
}
}
]
}