Suspicious Powershell Commandlet Executed

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Id	b5153fb3-ada9-4ce4-9131-79c771efb50d
Rulename	Suspicious Powershell Commandlet Executed
Description	This analytic rule detects when a suspicious PowerShell commandlet is executed on a host. Threat actors often use PowerShell to execute commands and scripts to move laterally, escalate privileges, and exfiltrate data.
Severity	Medium
Tactics	Execution
Techniques	T1059
Required data connectors	MicrosoftThreatProtection
Kind	Scheduled
Query frequency	1h
Query period	1h
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Endpoint Threat Protection Essentials/Analytic Rules/SuspiciousPowerShellCommandExecuted.yaml
Version	1.0.1
Arm template	b5153fb3-ada9-4ce4-9131-79c771efb50d.json

KQL

// Adjust the list of suspicious commandlets as needed
let SuspiciousPowerShellCommandList = dynamic(["Get-ADUserResultantPasswordPolicy",
  "Get-DomainPolicy",
  "Get-DomainUser",
  "Get-DomainComputer",
  "Get-DomainController",
  "Get-DomainGroup",
  "Get-DomainTrust",
  "Get-ADTrust",
  "Get-ForestTrust"
  ]);
DeviceEvents
| where ActionType == "PowerShellCommand"
| extend Commandlet = tostring(parse_json(AdditionalFields).Command)
| where Commandlet has_any (SuspiciousPowerShellCommandList)
| project TimeGenerated, DeviceName, LocalIP, InitiatingProcessAccountUpn, InitiatingProcessId, InitiatingProcessFileName, InitiatingProcessFolderPath, InitiatingProcessCommandLine
| extend Username = tostring(split(InitiatingProcessAccountUpn, '@')[0]), UPNSuffix = tostring(split(InitiatingProcessAccountUpn, '@')[1])
| extend DvcHostname = tostring(split(DeviceName, '.')[0]), DvcDomain = tostring(strcat_array(array_slice(split(DeviceName, '.'), 1, -1), '.'))

YAML

queryFrequency: 1h
eventGroupingSettings:
  aggregationKind: AlertPerResult
requiredDataConnectors:
- connectorId: MicrosoftThreatProtection
  dataTypes:
  - DeviceEvents
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Endpoint Threat Protection Essentials/Analytic Rules/SuspiciousPowerShellCommandExecuted.yaml
query: |
  // Adjust the list of suspicious commandlets as needed
  let SuspiciousPowerShellCommandList = dynamic(["Get-ADUserResultantPasswordPolicy",
    "Get-DomainPolicy",
    "Get-DomainUser",
    "Get-DomainComputer",
    "Get-DomainController",
    "Get-DomainGroup",
    "Get-DomainTrust",
    "Get-ADTrust",
    "Get-ForestTrust"
    ]);
  DeviceEvents
  | where ActionType == "PowerShellCommand"
  | extend Commandlet = tostring(parse_json(AdditionalFields).Command)
  | where Commandlet has_any (SuspiciousPowerShellCommandList)
  | project TimeGenerated, DeviceName, LocalIP, InitiatingProcessAccountUpn, InitiatingProcessId, InitiatingProcessFileName, InitiatingProcessFolderPath, InitiatingProcessCommandLine
  | extend Username = tostring(split(InitiatingProcessAccountUpn, '@')[0]), UPNSuffix = tostring(split(InitiatingProcessAccountUpn, '@')[1])
  | extend DvcHostname = tostring(split(DeviceName, '.')[0]), DvcDomain = tostring(strcat_array(array_slice(split(DeviceName, '.'), 1, -1), '.'))  
entityMappings:
- entityType: Host
  fieldMappings:
  - identifier: FullName
    columnName: DeviceName
  - identifier: HostName
    columnName: DvcHostname
  - identifier: DnsDomain
    columnName: DvcDomain
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: LocalIP
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: Username
  - identifier: UPNSuffix
    columnName: UPNSuffix
- entityType: Process
  fieldMappings:
  - identifier: ProcessId
    columnName: InitiatingProcessId
  - identifier: CommandLine
    columnName: InitiatingProcessCommandLine
relevantTechniques:
- T1059
name: Suspicious Powershell Commandlet Executed
description: |
    This analytic rule detects when a suspicious PowerShell commandlet is executed on a host. Threat actors often use PowerShell to execute commands and scripts to move laterally, escalate privileges, and exfiltrate data.
severity: Medium
queryPeriod: 1h
alertDetailsOverride:
  alertDescriptionFormat: "Suspicious PowerShell Commandlet by Process '{{InitiatingProcessFileName}}' ProcessId: '{{InitiatingProcessId}}' with commandline {{InitiatingProcessCommandLine}} was executed."
  alertDisplayNameFormat: Suspicious PowerShell Commandlet Executed on {{DvcHostname}} ({{LocalIP}}) by ({{InitiatingProcessAccountUpn}})
triggerOperator: gt
kind: Scheduled
status: Available
tactics:
- Execution
id: b5153fb3-ada9-4ce4-9131-79c771efb50d
version: 1.0.1
triggerThreshold: 0

ARM

{
  "$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/b5153fb3-ada9-4ce4-9131-79c771efb50d')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/b5153fb3-ada9-4ce4-9131-79c771efb50d')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "Suspicious PowerShell Commandlet by Process '{{InitiatingProcessFileName}}' ProcessId: '{{InitiatingProcessId}}' with commandline {{InitiatingProcessCommandLine}} was executed.",
          "alertDisplayNameFormat": "Suspicious PowerShell Commandlet Executed on {{DvcHostname}} ({{LocalIP}}) by ({{InitiatingProcessAccountUpn}})"
        },
        "alertRuleTemplateName": "b5153fb3-ada9-4ce4-9131-79c771efb50d",
        "customDetails": null,
        "description": "This analytic rule detects when a suspicious PowerShell commandlet is executed on a host. Threat actors often use PowerShell to execute commands and scripts to move laterally, escalate privileges, and exfiltrate data.\n",
        "displayName": "Suspicious Powershell Commandlet Executed",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Host",
            "fieldMappings": [
              {
                "columnName": "DeviceName",
                "identifier": "FullName"
              },
              {
                "columnName": "DvcHostname",
                "identifier": "HostName"
              },
              {
                "columnName": "DvcDomain",
                "identifier": "DnsDomain"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "LocalIP",
                "identifier": "Address"
              }
            ]
          },
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Username",
                "identifier": "Name"
              },
              {
                "columnName": "UPNSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "Process",
            "fieldMappings": [
              {
                "columnName": "InitiatingProcessId",
                "identifier": "ProcessId"
              },
              {
                "columnName": "InitiatingProcessCommandLine",
                "identifier": "CommandLine"
              }
            ]
          }
        ],
        "eventGroupingSettings": {
          "aggregationKind": "AlertPerResult"
        },
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Endpoint Threat Protection Essentials/Analytic Rules/SuspiciousPowerShellCommandExecuted.yaml",
        "query": "// Adjust the list of suspicious commandlets as needed\nlet SuspiciousPowerShellCommandList = dynamic([\"Get-ADUserResultantPasswordPolicy\",\n  \"Get-DomainPolicy\",\n  \"Get-DomainUser\",\n  \"Get-DomainComputer\",\n  \"Get-DomainController\",\n  \"Get-DomainGroup\",\n  \"Get-DomainTrust\",\n  \"Get-ADTrust\",\n  \"Get-ForestTrust\"\n  ]);\nDeviceEvents\n| where ActionType == \"PowerShellCommand\"\n| extend Commandlet = tostring(parse_json(AdditionalFields).Command)\n| where Commandlet has_any (SuspiciousPowerShellCommandList)\n| project TimeGenerated, DeviceName, LocalIP, InitiatingProcessAccountUpn, InitiatingProcessId, InitiatingProcessFileName, InitiatingProcessFolderPath, InitiatingProcessCommandLine\n| extend Username = tostring(split(InitiatingProcessAccountUpn, '@')[0]), UPNSuffix = tostring(split(InitiatingProcessAccountUpn, '@')[1])\n| extend DvcHostname = tostring(split(DeviceName, '.')[0]), DvcDomain = tostring(strcat_array(array_slice(split(DeviceName, '.'), 1, -1), '.'))\n",
        "queryFrequency": "PT1H",
        "queryPeriod": "PT1H",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Execution"
        ],
        "techniques": [
          "T1059"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}