SSM document is publicly exposed

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Id	75647b58-bcc8-4eb5-9658-46698d3fa153
Rulename	SSM document is publicly exposed
Description	Detected a SSM document that is publicly exposed, which could lead to sensitive information leakage to the public. Verify the object configurations.
Severity	Medium
Tactics	Discovery
Techniques	T1526
Required data connectors	AWS
Kind	Scheduled
Query frequency	1d
Query period	1d
Trigger threshold	0
Trigger operator	gt
Source Uri	https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_SSMPubliclyExposed.yaml
Version	1.0.1
Arm template	75647b58-bcc8-4eb5-9658-46698d3fa153.json

KQL

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

YAML

id: 75647b58-bcc8-4eb5-9658-46698d3fa153
requiredDataConnectors:
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
entityMappings:
- fieldMappings:
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountUPNSuffix
  - identifier: CloudAppAccountId
    columnName: RecipientAccountId
  entityType: Account
- fieldMappings:
  - identifier: Address
    columnName: SourceIpAddress
  entityType: IP
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  
triggerThreshold: 0
kind: Scheduled
severity: Medium
queryPeriod: 1d
tactics:
- Discovery
queryFrequency: 1d
status: Available
relevantTechniques:
- T1526
triggerOperator: gt
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.'
name: SSM document is publicly exposed
version: 1.0.1

ARM