AWSCloudTrail - Unauthorized EC2 Instance Setup Attempt

AWSCloudTrail
| where EventName == "RunInstances"
| where ErrorCode == "Client.UnauthorizedOperation"
| project TimeGenerated, AwsEventId, EventTypeName, UserIdentityPrincipalid, UserIdentityType,  UserIdentityAccountId, SessionMfaAuthenticated, SessionCreationDate, SessionIssuerUserName, SourceIpAddress, AWSRegion, UserAgent, RequestParameters, ErrorMessage
| extend UserName = substring(UserIdentityPrincipalid, indexof_regex(UserIdentityPrincipalid, ":") + 1)
| extend Name = split(UserName,'@')[0],UpnSuffix = split(UserName,'@')[1]

relevantTechniques:
- T1583
queryPeriod: 10m
query: |
  AWSCloudTrail
  | where EventName == "RunInstances"
  | where ErrorCode == "Client.UnauthorizedOperation"
  | project TimeGenerated, AwsEventId, EventTypeName, UserIdentityPrincipalid, UserIdentityType,  UserIdentityAccountId, SessionMfaAuthenticated, SessionCreationDate, SessionIssuerUserName, SourceIpAddress, AWSRegion, UserAgent, RequestParameters, ErrorMessage
  | extend UserName = substring(UserIdentityPrincipalid, indexof_regex(UserIdentityPrincipalid, ":") + 1)
  | extend Name = split(UserName,'@')[0],UpnSuffix = split(UserName,'@')[1]
id: f7210a45-12a4-4d02-b59e-f23476827a4b
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: Name
  - identifier: UPNSuffix
    columnName: UpnSuffix
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: SourceIpAddress
description: |
  Detects an unauthorized attempt to launch an EC2 instance by a user without the necessary permissions. This may indicate an attempt to provision malicious infrastructure within the AWS subscription. Reference: https://stratus-red-team.cloud/attack-techniques/AWS/aws.execution.ec2-launch-unusual-instances/
kind: Scheduled
triggerOperator: gt
queryFrequency: 10m
alertDetailsOverride:
  alertDescriptionFormat: User {{UserIdentityPrincipalid}} (type {{UserIdentityType}}) attempted an unauthorized EC2 instance launch in region {{AWSRegion}}.
  alertDisplayNameFormat: Unauthorized EC2 instance launch attempt by {{UserIdentityPrincipalid}} in {{AWSRegion}}
severity: Medium
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon%20Web%20Services/Analytic%20Rules/AWS_UnauthorizedInstanceSetUpAttempt.yaml
tactics:
- ResourceDevelopment
triggerThreshold: 0
status: Available
version: 1.0.1
requiredDataConnectors:
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
name: AWSCloudTrail - Unauthorized EC2 Instance Setup Attempt
customDetails:
  ErrorMessage: ErrorMessage
  UserAgent: UserAgent
  UserIdentityType: UserIdentityType
  AWSRegion: AWSRegion

{
  "$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/f7210a45-12a4-4d02-b59e-f23476827a4b')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/f7210a45-12a4-4d02-b59e-f23476827a4b')]",
      "properties": {
        "alertDetailsOverride": {
          "alertDescriptionFormat": "User {{UserIdentityPrincipalid}} (type {{UserIdentityType}}) attempted an unauthorized EC2 instance launch in region {{AWSRegion}}.",
          "alertDisplayNameFormat": "Unauthorized EC2 instance launch attempt by {{UserIdentityPrincipalid}} in {{AWSRegion}}"
        },
        "alertRuleTemplateName": "f7210a45-12a4-4d02-b59e-f23476827a4b",
        "customDetails": {
          "AWSRegion": "AWSRegion",
          "ErrorMessage": "ErrorMessage",
          "UserAgent": "UserAgent",
          "UserIdentityType": "UserIdentityType"
        },
        "description": "Detects an unauthorized attempt to launch an EC2 instance by a user without the necessary permissions. This may indicate an attempt to provision malicious infrastructure within the AWS subscription. Reference: https://stratus-red-team.cloud/attack-techniques/AWS/aws.execution.ec2-launch-unusual-instances/\n",
        "displayName": "AWSCloudTrail - Unauthorized EC2 Instance Setup Attempt",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "Name",
                "identifier": "Name"
              },
              {
                "columnName": "UpnSuffix",
                "identifier": "UPNSuffix"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SourceIpAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon%20Web%20Services/Analytic%20Rules/AWS_UnauthorizedInstanceSetUpAttempt.yaml",
        "query": "AWSCloudTrail\n| where EventName == \"RunInstances\"\n| where ErrorCode == \"Client.UnauthorizedOperation\"\n| project TimeGenerated, AwsEventId, EventTypeName, UserIdentityPrincipalid, UserIdentityType,  UserIdentityAccountId, SessionMfaAuthenticated, SessionCreationDate, SessionIssuerUserName, SourceIpAddress, AWSRegion, UserAgent, RequestParameters, ErrorMessage\n| extend UserName = substring(UserIdentityPrincipalid, indexof_regex(UserIdentityPrincipalid, \":\") + 1)\n| extend Name = split(UserName,'@')[0],UpnSuffix = split(UserName,'@')[1]\n",
        "queryFrequency": "PT10M",
        "queryPeriod": "PT10M",
        "severity": "Medium",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "ResourceDevelopment"
        ],
        "techniques": [
          "T1583"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}