Changes to internet facing AWS RDS Database instances

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Id	8c2ef238-67a0-497d-b1dd-5c8a0f533e25
Rulename	Changes to internet facing AWS RDS Database instances
Description	Amazon Relational Database Service (RDS) is scalable relational database in the cloud. If your organization have one or more AWS RDS Databases running, monitoring changes to especially internet facing AWS RDS (Relational Database Service) Once alerts triggered, validate if changes observed are authorized and adhere to change control policy. RDS API Reference Docs: https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_Operations.html
Severity	Low
Tactics	Persistence
Techniques	T1098
Required data connectors	AWS AWSS3
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_ChangeToRDSDatabase.yaml
Version	1.0.4
Arm template	8c2ef238-67a0-497d-b1dd-5c8a0f533e25.json

KQL

let EventNameList = dynamic(["AuthorizeDBSecurityGroupIngress","CreateDBSecurityGroup","DeleteDBSecurityGroup","RevokeDBSecurityGroupIngress"]);
AWSCloudTrail
| where EventName in~ (EventNameList)
| 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, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityAccountId, UserIdentityPrincipalid, UserAgent, UserIdentityUserName, SessionMfaAuthenticated, SourceIpAddress, AWSRegion, EventSource, AdditionalEventData, ResponseElements
| extend timestamp = StartTimeUtc

YAML

OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_ChangeToRDSDatabase.yaml
queryPeriod: 1d
description: |
  'Amazon Relational Database Service (RDS) is scalable relational database in the cloud.
  If your organization have one or more AWS RDS Databases running, monitoring changes to especially internet facing AWS RDS (Relational Database Service)
  Once alerts triggered, validate if changes observed are authorized and adhere to change control policy.
  RDS API Reference Docs: https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_Operations.html'  
triggerThreshold: 0
name: Changes to internet facing AWS RDS Database instances
triggerOperator: gt
entityMappings:
- entityType: Account
  fieldMappings:
  - identifier: Name
    columnName: AccountName
  - identifier: UPNSuffix
    columnName: AccountUPNSuffix
  - identifier: CloudAppAccountId
    columnName: RecipientAccountId
- entityType: IP
  fieldMappings:
  - identifier: Address
    columnName: SourceIpAddress
kind: Scheduled
requiredDataConnectors:
- connectorId: AWS
  dataTypes:
  - AWSCloudTrail
- connectorId: AWSS3
  dataTypes:
  - AWSCloudTrail
queryFrequency: 1d
tactics:
- Persistence
id: 8c2ef238-67a0-497d-b1dd-5c8a0f533e25
status: Available
version: 1.0.4
query: |
  let EventNameList = dynamic(["AuthorizeDBSecurityGroupIngress","CreateDBSecurityGroup","DeleteDBSecurityGroup","RevokeDBSecurityGroupIngress"]);
  AWSCloudTrail
  | where EventName in~ (EventNameList)
  | 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, RecipientAccountId, AccountName, AccountUPNSuffix, UserIdentityAccountId, UserIdentityPrincipalid, UserAgent, UserIdentityUserName, SessionMfaAuthenticated, SourceIpAddress, AWSRegion, EventSource, AdditionalEventData, ResponseElements
  | extend timestamp = StartTimeUtc  
severity: Low
relevantTechniques:
- T1098

ARM