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. More information: https://medium.com/@GorillaStack/the-most-important-aws-cloudtrail-security-events-to-track-a5b9873f8255 and 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	1.0.3
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

name: Changes to internet facing AWS RDS Database instances
id: 8c2ef238-67a0-497d-b1dd-5c8a0f533e25
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.
  More information: https://medium.com/@GorillaStack/the-most-important-aws-cloudtrail-security-events-to-track-a5b9873f8255 
  and RDS API Reference Docs: https://docs.aws.amazon.com/AmazonRDS/latest/APIReference/API_Operations.html'  
triggerThreshold: 0
entityMappings:
- fieldMappings:
  - columnName: AccountName
    identifier: Name
  - columnName: AccountUPNSuffix
    identifier: UPNSuffix
  - columnName: RecipientAccountId
    identifier: CloudAppAccountId
  entityType: Account
- fieldMappings:
  - columnName: SourceIpAddress
    identifier: Address
  entityType: IP
version: 1.0.3
triggerOperator: gt
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  
tactics:
- Persistence
kind: Scheduled
queryFrequency: 1d
severity: Low
queryPeriod: 1d
requiredDataConnectors:
- dataTypes:
  - AWSCloudTrail
  connectorId: AWS
- dataTypes:
  - AWSCloudTrail
  connectorId: AWSS3
status: Available
OriginalUri: https://github.com/Azure/Azure-Sentinel/blob/master/Solutions/Amazon Web Services/Analytic Rules/AWS_ChangeToRDSDatabase.yaml
relevantTechniques:
- T1098

ARM