Cross-Cloud Unauthorized Credential Access Detection From AWS RDS Login

Severity: medium
Time window: 1d
Group by: AWSNetworkEntity, AuthenticationRequirement, ClientAppUsed, ConditionalAccessStatus, IPAddress, OperationName, RiskDetail, UserAgent, UserPrincipalName
Source: github.com/Azure/Azure-Sentinel

This detection correlates AWS GuardDuty Credential Access alerts related to Amazon Relational Database Service (RDS) activity with Azure portal sign-in activities. It identifies successful and failed logins, anomalous behavior, and malicious IP access. By joining these datasets on network entities and IP addresses, it detects unauthorized credential access attempts across AWS and Azure resources, enhancing cross-cloud security monitoring.

MITRE ATT&CK coverage

Tactic	Techniques
Initial Access	`T1133` External Remote Services
Credential Access	`T1110.003` Brute Force: Password Spraying `T1110.004` Brute Force: Credential Stuffing `T1556` Modify Authentication Process `T1557` Adversary-in-the-Middle `T1606` Forge Web Credentials

Telemetry coverage

Platform	Record / event type
Entra ID	`SigninLogs` sign-in event: Sign-in naming a target application

Rule body

id: 122fbc6a-57ab-4aa7-b9a9-51ac4970cac1
name: Cross-Cloud Unauthorized Credential Access Detection From AWS RDS Login 
description: |
  'This detection correlates AWS GuardDuty Credential Access alerts related to Amazon Relational Database Service (RDS) activity with Azure portal sign-in activities. It identifies successful and failed logins, anomalous behavior, and malicious IP access. By joining these datasets on network entities and IP addresses, it detects unauthorized credential access attempts across AWS and Azure resources, enhancing cross-cloud security monitoring.'
severity: Medium
requiredDataConnectors:
  - connectorId: AzureActiveDirectory
    dataTypes:
      - SigninLogs
  - connectorId: AWSS3
    dataTypes:
      - AWSGuardDuty
queryFrequency: 1d
queryPeriod: 1d
triggerOperator: gt
triggerThreshold: 0
tactics:
  - CredentialAccess
  - InitialAccess
relevantTechniques:
  - T1557
  - T1110
  - T1110.003
  - T1110.004
  - T1606
  - T1556
  - T1133
query: |
    // Define variable 'AwsAlert' to collect AWS GuardDuty CredentialAccess alerts related to Amazon Relational Database Service (RDS) activity
    let AwsAlert = materialize (
        AWSGuardDuty
        | where ActivityType has_any (
            "CredentialAccess:RDS/TorIPCaller.SuccessfulLogin",
            "CredentialAccess:RDS/TorIPCaller.FailedLogin",
            "CredentialAccess:RDS/AnomalousBehavior.SuccessfulBruteForce",
            "CredentialAccess:RDS/AnomalousBehavior.SuccessfulLogin",
            "CredentialAccess:RDS/MaliciousIPCaller.SuccessfulLogin",
            "CredentialAccess:RDS/MaliciousIPCaller.FailedLogin"
            )
        | extend
            AWSAlertId = Id, 
            AWSAlertTitle = Title,
            AWSAlertDescription = Description,
            AWSresourceType = tostring(parse_json(ResourceDetails).resourceType),
            AWSNetworkEntity = tostring(parse_json(ServiceDetails).action.rdsLoginAttemptAction.remoteIpDetails.ipAddressV4),
            RDSInstanceId = tostring(parse_json(ResourceDetails).rdsDbInstanceDetails.dbInstanceIdentifier),
            RDSUser = tostring(parse_json(ResourceDetails).rdsDbUserDetails.user),
            RDSApplication = tostring(parse_json(ResourceDetails).rdsDbUserDetails.application),
            RDSactionType = tostring(parse_json(ServiceDetails).action.actionType),
            AWSAlertTime = TimeCreated,
            AWSAlertLink= tostring(strcat('https://us-east-1.console.aws.amazon.com/guardduty/home?region=us-east-1#/findings?macros=current&fId=',Id)),
            Severity = 
      case (
        Severity >= 7.0, "High",
        Severity between (4.0 .. 6.9), "Medium",
        Severity between (1.0 .. 3.9), "Low",
        "Unknown")
        | distinct
            AWSAlertTime,
            ActivityType,
            AWSAlertId,
            AWSAlertLink,
            AWSAlertTitle,
            AWSAlertDescription,
            AWSresourceType,
            Arn,
            Severity,
            RDSactionType,
            RDSApplication,
            RDSInstanceId,
            RDSUser,
            AWSNetworkEntity
        );
      // Define variable 'Azure_sigin' to collect Azure portal sign-in activities
      let Azure_sigin = materialize (
          SigninLogs
          | where AppDisplayName == "Azure Portal"
          | where isnotempty(OriginalRequestId)
          | summarize 
              AzureSuccessfulEvent = countif(ResultType == 0), 
              AzureFailedEvent = countif(ResultType != 0), 
              totalAzureLoginEventId = dcount(OriginalRequestId), 
              AzureFailedEventsCount = dcountif(OriginalRequestId, ResultType != 0), 
              AzureSuccessfuleventsCount = dcountif(OriginalRequestId, ResultType == 0),
              AzureSetOfFailedevents = makeset(iff(ResultType != 0, OriginalRequestId, ""), 5), 
              AzureSetOfSuccessfulEvents = makeset(iff(ResultType == 0, OriginalRequestId, ""), 5) 
              by 
              IPAddress, 
              UserPrincipalName, 
              bin(TimeGenerated, 1min), 
              UserAgent,
              ConditionalAccessStatus,
              OperationName,
              RiskDetail,
              AuthenticationRequirement,
              ClientAppUsed
          // Extracting the name and UPN suffix from UserPrincipalName
          | extend
              Name = tostring(split(UserPrincipalName, '@')[0]),
              UPNSuffix = tostring(split(UserPrincipalName, '@')[1])
          );
      // Join 'AwsAlert' and 'Azure_sigin' on the AWS Network Entity and Azure IP Address
      AwsAlert
      | join kind=inner Azure_sigin on $left.AWSNetworkEntity == $right.IPAddress
entityMappings:
  - entityType: IP
    fieldMappings:
      - identifier: Address
        columnName: IPAddress
  - entityType: Account
    fieldMappings:
      - identifier: FullName
        columnName: UserPrincipalName
      - identifier: Name
        columnName: Name
      - identifier: UPNSuffix
        columnName: UPNSuffix
customDetails:
  AWSAlertUserName: RDSUser
  AWSArn: Arn
  AWSresourceType: AWSresourceType
  AWSInstanceType: RDSactionType
  AWSAplicationName: RDSApplication
  AWSInstanceId: RDSInstanceId
  AzureUserAgent: UserAgent
  AzureUser: UserPrincipalName
  AzureClientAppUsed: ClientAppUsed
  AzConditionalAccess: ConditionalAccessStatus
  AzureOperationName: OperationName
  AzureRiskDetail: RiskDetail
  AzAuthRequirement: AuthenticationRequirement
  alertSeverity: Severity
alertDetailsOverride:
  alertDisplayNameFormat: "IP address {{IPAddress}} in {{AWSAlertTitle}} seen in Azure Signin Logs with {{UserPrincipalName}}"
  alertDescriptionFormat: "This detection correlates AWS GuardDuty Credential Access alert described '{{AWSAlertDescription}}' related to Amazon Relational Database Service (RDS) activity with Azure portal sign-in activities. It identifies successful and failed logins, anomalous behavior, and malicious IP access. By joining these datasets on network entities and IP addresses, it detects unauthorized credential access attempts across AWS and Azure resources, enhancing cross-cloud security monitoring. \n\n AWS ALert Link : '{{AWSAlertLink}}' \n\n Find More Details :https://docs.aws.amazon.com/guardduty/latest/ug/guardduty_finding-types-active.html"
  alertSeverityColumnName: Severity
  alertDynamicProperties:
    - alertProperty: AlertLink
      value: AWSAlertLink
    - alertProperty: ProviderName
      value: "AWS"
    - alertProperty: ProductName
      value: "AWSGuardDuty"
    - alertProperty: ProductComponentName
      value: "AWSGuardDuty"
kind: Scheduled
version: 1.0.3

Stages and Predicates

let AwsAlert is inlined into the numbered stages below.

Let binding: `Azure_sigin` used in Stage 5

let Azure_sigin = materialize (
      SigninLogs
      | where AppDisplayName == "Azure Portal"
      | where isnotempty(OriginalRequestId)
      | summarize 
          AzureSuccessfulEvent = countif(ResultType == 0), 
          AzureFailedEvent = countif(ResultType != 0), 
          totalAzureLoginEventId = dcount(OriginalRequestId), 
          AzureFailedEventsCount = dcountif(OriginalRequestId, ResultType != 0), 
          AzureSuccessfuleventsCount = dcountif(OriginalRequestId, ResultType == 0),
          AzureSetOfFailedevents = makeset(iff(ResultType != 0, OriginalRequestId, ""), 5), 
          AzureSetOfSuccessfulEvents = makeset(iff(ResultType == 0, OriginalRequestId, ""), 5) 
          by 
          IPAddress, 
          UserPrincipalName, 
          bin(TimeGenerated, 1min), 
          UserAgent,
          ConditionalAccessStatus,
          OperationName,
          RiskDetail,
          AuthenticationRequirement,
          ClientAppUsed
      | extend
          Name = tostring(split(UserPrincipalName, '@')[0]),
          UPNSuffix = tostring(split(UserPrincipalName, '@')[1])
      );

Stages 1 to 4 define let AwsAlert (the rule's main pipeline source); stages 5 to 6 run on it.

Stage 1: `source`

AWSGuardDuty

Stage 2: `where`

| where ActivityType has_any (
        "CredentialAccess:RDS/TorIPCaller.SuccessfulLogin",
        "CredentialAccess:RDS/TorIPCaller.FailedLogin",
        "CredentialAccess:RDS/AnomalousBehavior.SuccessfulBruteForce",
        "CredentialAccess:RDS/AnomalousBehavior.SuccessfulLogin",
        "CredentialAccess:RDS/MaliciousIPCaller.SuccessfulLogin",
        "CredentialAccess:RDS/MaliciousIPCaller.FailedLogin"
        )

Stage 3: `extend`

| extend
        AWSAlertId = Id, 
        AWSAlertTitle = Title,
        AWSAlertDescription = Description,
        AWSresourceType = tostring(parse_json(ResourceDetails).resourceType),
        AWSNetworkEntity = tostring(parse_json(ServiceDetails).action.rdsLoginAttemptAction.remoteIpDetails.ipAddressV4),
        RDSInstanceId = tostring(parse_json(ResourceDetails).rdsDbInstanceDetails.dbInstanceIdentifier),
        RDSUser = tostring(parse_json(ResourceDetails).rdsDbUserDetails.user),
        RDSApplication = tostring(parse_json(ResourceDetails).rdsDbUserDetails.application),
        RDSactionType = tostring(parse_json(ServiceDetails).action.actionType),
        AWSAlertTime = TimeCreated,
        AWSAlertLink= tostring(strcat('https://us-east-1.console.aws.amazon.com/guardduty/home?region=us-east-1#/findings?macros=current&fId=',Id)),
        Severity = 
  case (
    Severity >= 7.0, "High",
    Severity between (4.0 .. 6.9), "Medium",
    Severity between (1.0 .. 3.9), "Low",
    "Unknown")

Severity =

ifSeverity >= 7.0"High"

elifSeverity >= 4.0 and Severity <= 6.9"Medium"

elifSeverity >= 1.0 and Severity <= 3.9"Low"

else"Unknown"

Stage 4: `distinct`

| distinct
        AWSAlertTime,
        ActivityType,
        AWSAlertId,
        AWSAlertLink,
        AWSAlertTitle,
        AWSAlertDescription,
        AWSresourceType,
        Arn,
        Severity,
        RDSactionType,
        RDSApplication,
        RDSInstanceId,
        RDSUser,
        AWSNetworkEntity

Stage 5: `join`

AwsAlert
| join kind=inner Azure_sigin on $left.AWSNetworkEntity == $right.IPAddress

Stage 6: `summarize` aggregation inside the `join` branch

summarize by IPAddress, UserPrincipalName, UserAgent, ConditionalAccessStatus, OperationName, RiskDetail, AuthenticationRequirement, ClientAppUsed

Indicators

These rows show field, operator, and value matches.

Field	Kind	Values	Search
`ActivityType`	match	`CredentialAccess:RDS/AnomalousBehavior.SuccessfulBruteForce` transforms: `term` `CredentialAccess:RDS/AnomalousBehavior.SuccessfulLogin` transforms: `term` `CredentialAccess:RDS/MaliciousIPCaller.FailedLogin` transforms: `term` `CredentialAccess:RDS/MaliciousIPCaller.SuccessfulLogin` transforms: `term` `CredentialAccess:RDS/TorIPCaller.FailedLogin` transforms: `term` `CredentialAccess:RDS/TorIPCaller.SuccessfulLogin` transforms: `term`	`field:"ActivityType" kind:match`
`AppDisplayName`	eq	`Azure Portal`	`field:"AppDisplayName" kind:eq value:"Azure Portal"`
`OriginalRequestId`	is_not_null	(no value, null check)	`field:"OriginalRequestId" kind:is_not_null`

Output fields

These fields are emitted when the rule matches.

Field	Source
`AuthenticationRequirement`	`summarize`
`ClientAppUsed`	`summarize`
`ConditionalAccessStatus`	`summarize`
`IPAddress`	`summarize`
`OperationName`	`summarize`
`RiskDetail`	`summarize`
`UserAgent`	`summarize`
`UserPrincipalName`	`summarize`

Cross-Cloud Unauthorized Credential Access Detection From AWS RDS Login

MITRE ATT&CK coverage

Telemetry coverage

Rule body

Stages and Predicates

Let binding: Azure_sigin used in Stage 5

Stage 1: source

Stage 2: where

Stage 3: extend

Stage 4: distinct

Stage 5: join

Stage 6: summarize aggregation inside the join branch