Microsoft Sentinel Analytic Rules
cloudbrothers.infoAzure Sentinel RepoToggle Dark/Light/Auto modeToggle Dark/Light/Auto modeToggle Dark/Light/Auto modeBack to homepage

SSM document is publicly exposed

Back
Id75647b58-bcc8-4eb5-9658-46698d3fa153
RulenameSSM document is publicly exposed
DescriptionDetected a SSM document that is publicly exposed, which could lead to sensitive information leakage to the public. Verify the object configurations.
SeverityMedium
TacticsDiscovery
TechniquesT1526
Required data connectorsAWS
KindScheduled
Query frequency1d
Query period1d
Trigger threshold0
Trigger operatorgt
Source Urihttps://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_SSMPubliclyExposed.yaml
Version1.0.1
Arm template75647b58-bcc8-4eb5-9658-46698d3fa153.json
Deploy To Azure
AWSCloudTrail
| where  EventName == "ModifyDocumentPermission" and isempty(ErrorCode) and isempty(ErrorMessage)
| where todynamic(parse_json(RequestParameters).["accountIdsToAdd"]) == '["all"]'
| 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]), "")  
| project TimeGenerated, EventName, EventTypeName, UserIdentityAccountId, UserIdentityPrincipalid, UserAgent,UserIdentityUserName, SessionMfaAuthenticated, RecipientAccountId, AccountName, AccountUPNSuffix, SourceIpAddress, AWSRegion, EventSource, AdditionalEventData, RequestParameters, ResponseElements, UserIdentityArn
| extend timestamp = TimeGenerated
queryFrequency: 1d
tactics:
- Discovery
queryPeriod: 1d
kind: Scheduled
relevantTechniques:
- T1526
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_SSMPubliclyExposed.yaml
description: |
    'Detected a SSM document that is publicly exposed, which could lead to sensitive information leakage to the public. Verify the object configurations.'
requiredDataConnectors:
- dataTypes:
  - AWSCloudTrail
  connectorId: AWS
version: 1.0.1
triggerThreshold: 0
severity: Medium
triggerOperator: gt
id: 75647b58-bcc8-4eb5-9658-46698d3fa153
entityMappings:
- entityType: Account
  fieldMappings:
  - columnName: AccountName
    identifier: Name
  - columnName: AccountUPNSuffix
    identifier: UPNSuffix
  - columnName: RecipientAccountId
    identifier: CloudAppAccountId
- entityType: IP
  fieldMappings:
  - columnName: SourceIpAddress
    identifier: Address
status: Available
name: SSM document is publicly exposed
query: |
  AWSCloudTrail
  | where  EventName == "ModifyDocumentPermission" and isempty(ErrorCode) and isempty(ErrorMessage)
  | where todynamic(parse_json(RequestParameters).["accountIdsToAdd"]) == '["all"]'
  | 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]), "")  
  | project TimeGenerated, EventName, EventTypeName, UserIdentityAccountId, UserIdentityPrincipalid, UserAgent,UserIdentityUserName, SessionMfaAuthenticated, RecipientAccountId, AccountName, AccountUPNSuffix, SourceIpAddress, AWSRegion, EventSource, AdditionalEventData, RequestParameters, ResponseElements, UserIdentityArn
  | extend timestamp = TimeGenerated  
{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "workspace": {
      "type": "String"
    }
  },
  "resources": [
    {
      "apiVersion": "2023-02-01-preview",
      "id": "[concat(resourceId('Microsoft.OperationalInsights/workspaces/providers', parameters('workspace'), 'Microsoft.SecurityInsights'),'/alertRules/75647b58-bcc8-4eb5-9658-46698d3fa153')]",
      "kind": "Scheduled",
      "name": "[concat(parameters('workspace'),'/Microsoft.SecurityInsights/75647b58-bcc8-4eb5-9658-46698d3fa153')]",
      "properties": {
        "alertRuleTemplateName": "75647b58-bcc8-4eb5-9658-46698d3fa153",
        "customDetails": null,
        "description": "'Detected a SSM document that is publicly exposed, which could lead to sensitive information leakage to the public. Verify the object configurations.'\n",
        "displayName": "SSM document is publicly exposed",
        "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/AWS_SSMPubliclyExposed.yaml",
        "query": "AWSCloudTrail\n| where  EventName == \"ModifyDocumentPermission\" and isempty(ErrorCode) and isempty(ErrorMessage)\n| where todynamic(parse_json(RequestParameters).[\"accountIdsToAdd\"]) == '[\"all\"]'\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| project TimeGenerated, EventName, EventTypeName, UserIdentityAccountId, UserIdentityPrincipalid, UserAgent,UserIdentityUserName, SessionMfaAuthenticated, RecipientAccountId, AccountName, AccountUPNSuffix, SourceIpAddress, AWSRegion, EventSource, AdditionalEventData, RequestParameters, ResponseElements, UserIdentityArn\n| extend timestamp = TimeGenerated\n",
        "queryFrequency": "P1D",
        "queryPeriod": "P1D",
        "severity": "Medium",
        "status": "Available",
        "suppressionDuration": "PT1H",
        "suppressionEnabled": false,
        "tactics": [
          "Discovery"
        ],
        "techniques": [
          "T1526"
        ],
        "templateVersion": "1.0.1",
        "triggerOperator": "GreaterThan",
        "triggerThreshold": 0
      },
      "type": "Microsoft.OperationalInsights/workspaces/providers/alertRules"
    }
  ]
}