NRT Login to AWS Management Console without MFA

AWSCloudTrail
| where EventName =~ "ConsoleLogin"
| extend MFAUsed = tostring(parse_json(AdditionalEventData).MFAUsed), LoginResult = tostring(parse_json(ResponseElements).ConsoleLogin)
| where MFAUsed !~ "Yes" and LoginResult !~ "Failure"
| where SessionIssuerUserName !contains "AWSReservedSSO"
| extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)
| extend UserName = tostring(split(UserIdentityArn, '/')[-1])
| extend AccountName = case( UserIdentityPrincipalid == "Anonymous", "Anonymous", isempty(UserIdentityUserName), UserName, UserIdentityUserName)
| extend AccountName = iif(AccountName contains "@", tostring(split(AccountName, '@', 0)[0]), AccountName),
  AccountUPNSuffix = iif(AccountName contains "@", tostring(split(AccountName, '@', 1)[0]), "")
| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by EventName, EventTypeName, LoginResult, MFAUsed, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityAccountId,  UserIdentityPrincipalid, UserAgent,
  UserIdentityUserName, SessionMfaAuthenticated, SourceIpAddress, AWSRegion

severity: Low
entityMappings:
- fieldMappings:
  - columnName: AccountName
    identifier: Name
  - columnName: AccountUPNSuffix
    identifier: UPNSuffix
  - columnName: RecipientAccountId
    identifier: CloudAppAccountId
  entityType: Account
- fieldMappings:
  - columnName: SourceIpAddress
    identifier: Address
  entityType: IP
id: 0ee2aafb-4500-4e36-bcb1-e90eec2f0b9b
description: |
  'Multi-Factor Authentication (MFA) helps you to prevent credential compromise. This alert identifies logins to the AWS Management Console without MFA.
  You can limit this detection to trigger for administrative accounts if you do not have MFA enabled on all accounts.
  This is done by looking at the eventName ConsoleLogin and if the AdditionalEventData field indicates MFA was NOT used and the ResponseElements field indicates NOT a Failure. Thereby indicating that a non-MFA login was successful.'  
tactics:
- DefenseEvasion
- PrivilegeEscalation
- Persistence
- InitialAccess
query: |
  AWSCloudTrail
  | where EventName =~ "ConsoleLogin"
  | extend MFAUsed = tostring(parse_json(AdditionalEventData).MFAUsed), LoginResult = tostring(parse_json(ResponseElements).ConsoleLogin)
  | where MFAUsed !~ "Yes" and LoginResult !~ "Failure"
  | where SessionIssuerUserName !contains "AWSReservedSSO"
  | extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)
  | extend UserName = tostring(split(UserIdentityArn, '/')[-1])
  | extend AccountName = case( UserIdentityPrincipalid == "Anonymous", "Anonymous", isempty(UserIdentityUserName), UserName, UserIdentityUserName)
  | extend AccountName = iif(AccountName contains "@", tostring(split(AccountName, '@', 0)[0]), AccountName),
    AccountUPNSuffix = iif(AccountName contains "@", tostring(split(AccountName, '@', 1)[0]), "")
  | summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by EventName, EventTypeName, LoginResult, MFAUsed, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityAccountId,  UserIdentityPrincipalid, UserAgent,
    UserIdentityUserName, SessionMfaAuthenticated, SourceIpAddress, AWSRegion  
name: NRT Login to AWS Management Console without MFA
relevantTechniques:
- T1078
requiredDataConnectors:
- dataTypes:
  - AWSCloudTrail
  connectorId: AWS
- dataTypes:
  - AWSCloudTrail
  connectorId: AWSS3
version: 1.0.3
kind: NRT
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/NRT_AWS_ConsoleLogonWithoutMFA.yaml

{
  "$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/0ee2aafb-4500-4e36-bcb1-e90eec2f0b9b')]",
      "kind": "NRT",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/0ee2aafb-4500-4e36-bcb1-e90eec2f0b9b')]",
      "properties": {
        "alertRuleTemplateName": "0ee2aafb-4500-4e36-bcb1-e90eec2f0b9b",
        "customDetails": null,
        "description": "'Multi-Factor Authentication (MFA) helps you to prevent credential compromise. This alert identifies logins to the AWS Management Console without MFA.\nYou can limit this detection to trigger for administrative accounts if you do not have MFA enabled on all accounts.\nThis is done by looking at the eventName ConsoleLogin and if the AdditionalEventData field indicates MFA was NOT used and the ResponseElements field indicates NOT a Failure. Thereby indicating that a non-MFA login was successful.'\n",
        "displayName": "NRT Login to AWS Management Console without MFA",
        "enabled": true,
        "entityMappings": [
          {
            "entityType": "Account",
            "fieldMappings": [
              {
                "columnName": "AccountName",
                "identifier": "Name"
              },
              {
                "columnName": "AccountUPNSuffix",
                "identifier": "UPNSuffix"
              },
              {
                "columnName": "RecipientAccountId",
                "identifier": "CloudAppAccountId"
              }
            ]
          },
          {
            "entityType": "IP",
            "fieldMappings": [
              {
                "columnName": "SourceIpAddress",
                "identifier": "Address"
              }
            ]
          }
        ],
        "OriginalUri": "https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/NRT_AWS_ConsoleLogonWithoutMFA.yaml",
        "query": "AWSCloudTrail\n| where EventName =~ \"ConsoleLogin\"\n| extend MFAUsed = tostring(parse_json(AdditionalEventData).MFAUsed), LoginResult = tostring(parse_json(ResponseElements).ConsoleLogin)\n| where MFAUsed !~ \"Yes\" and LoginResult !~ \"Failure\"\n| where SessionIssuerUserName !contains \"AWSReservedSSO\"\n| extend UserIdentityArn = iif(isempty(UserIdentityArn), tostring(parse_json(Resources)[0].ARN), UserIdentityArn)\n| extend UserName = tostring(split(UserIdentityArn, '/')[-1])\n| extend AccountName = case( UserIdentityPrincipalid == \"Anonymous\", \"Anonymous\", isempty(UserIdentityUserName), UserName, UserIdentityUserName)\n| extend AccountName = iif(AccountName contains \"@\", tostring(split(AccountName, '@', 0)[0]), AccountName),\n  AccountUPNSuffix = iif(AccountName contains \"@\", tostring(split(AccountName, '@', 1)[0]), \"\")\n| summarize StartTimeUtc = min(TimeGenerated), EndTimeUtc = max(TimeGenerated) by EventName, EventTypeName, LoginResult, MFAUsed, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityAccountId,  UserIdentityPrincipalid, UserAgent,\n  UserIdentityUserName, SessionMfaAuthenticated, SourceIpAddress, AWSRegion\n",
        "severity": "Low",
        "status": "Available",
        "subTechniques": [],
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "DefenseEvasion",
          "InitialAccess",
          "Persistence",
          "PrivilegeEscalation"
        ],
        "techniques": [
          "T1078"
        ],
        "templateVersion": "1.0.3"
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}