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Correlation engine APIs

Correlation engine APIs allow you to create new correlation rules, view findings and correlations within a certain time window, and perform other tasks.

Create correlation rules between log types

You can use the following API to create correlation rules:

POST /_plugins/_security_analytics/correlation/rules

Request fields

Field	Type	Description
`index`	String	The name of the index used as the log source.
`query`	String	The query used to filter security logs for correlation.
`category`	String	The log type associated with the log source.

Example request

POST /_plugins/_security_analytics/correlation/rules
{
  "correlate": [
    {
      "index": "vpc_flow",
      "query": "dstaddr:4.5.6.7 or dstaddr:4.5.6.6",
      "category": "network"
    },
    {
      "index": "windows",
      "query": "winlog.event_data.SubjectDomainName:NTAUTHORI*",
      "category": "windows"
    },
    {
      "index": "ad_logs",
      "query": "ResultType:50126",
      "category": "ad_ldap"
    },
    {
      "index": "app_logs",
      "query": "endpoint:/customer_records.txt",
      "category": "others_application"
    }
  ]
}

Example response

{
  "_id": "DxKEUIkBpIjg64IK4nXg",
  "_version": 1,
  "rule": {
    "name": null,
    "correlate": [
      {
        "index": "vpc_flow",
        "query": "dstaddr:4.5.6.7 or dstaddr:4.5.6.6",
        "category": "network"
      },
      {
        "index": "windows",
        "query": "winlog.event_data.SubjectDomainName:NTAUTHORI*",
        "category": "windows"
      },
      {
        "index": "ad_logs",
        "query": "ResultType:50126",
        "category": "ad_ldap"
      },
      {
        "index": "app_logs",
        "query": "endpoint:/customer_records.txt",
        "category": "others_application"
      }
    ]
  }
}

Response fields

Field	Type	Description
`_id`	String	The Id for the new rule.

List all findings and correlations within a certain time window

You can use the following API to list all findings and their correlations within a certain time window:

GET /_plugins/_security_analytics/correlations?start_timestamp=<start time in milliseconds>&end_timestamp=<end time in milliseconds>

Query parameters

Parameter	Type	Description
`start_timestamp`	Number	Start time for the time window, in milliseconds.
`end_timestamp`	Number	End time for the time window, in milliseconds.

Example request

GET /_plugins/_security_analytics/correlations?start_timestamp=1689289210000&end_timestamp=1689300010000

Example response

{
  "findings": [
    {
      "finding1": "931de5f0-a276-45d5-9cdb-83e1045a3630",
      "logType1": "network",
      "finding2": "1e6f6a12-83f1-4a38-9bb8-648f196859cc",
      "logType2": "test_windows",
      "rules": [
        "nqI2TokBgL5wWFPZ6Gfu"
      ]
    }
  ]
}

Response fields

Field	Type	Description
`finding1`	String	The Id for a first finding in the correlation.
`logType1`	String	The log type associated with the first finding.
`finding2`	String	The Id for a second finding in the correlation.
`logType2`	String	The log type associated with the second finding.
`rules`	Array	A list of correlation rule IDs associated with the correlated findings.

List correlations for a finding belonging to a log type

You can use the following API to list correlations for certain findings and associated log types:

GET /_plugins/_security_analytics/findings/correlate?finding=425dce0b-f5ee-4889-b0c0-7d15669f0871&detector_type=ad_ldap&nearby_findings=20&time_window=10m

Query parameters

Parameter	Type	Description
`finding`	String	The finding ID.
`detector_type`	String	The log type for the detector.
`nearby_findings`	Number	The number of nearby findings with respect to the given finding Id.
`time_window`	String	Sets a time window in which all of the correlations must have occurred together.

Example request

GET /_plugins/_security_analytics/findings/correlate?finding=425dce0b-f5ee-4889-b0c0-7d15669f0871&detector_type=ad_ldap&nearby_findings=20&time_window=10m

Example response

{
  "findings": [
    {
      "finding": "5c661104-aaa9-484b-a91f-9cad4ae6d5f5",
      "detector_type": "others_application",
      "score": 0.000015182109564193524
    },
    {
      "finding": "2485b623-6573-42f4-a055-9b927e38a65f",
      "detector_type": "ad_ldap",
      "score": 0.000001615897872397909
    },
    {
      "finding": "051e00ad-5996-4c41-be20-f992451d1331",
      "detector_type": "windows",
      "score": 0.000016230604160227813
    },
    {
      "finding": "f11ca8a3-50d7-4074-a951-51439aa9e67b",
      "detector_type": "s3",
      "score": 0.000001759401811796124
    },
    {
      "finding": "9b86980e-5fb7-4c5a-bd1b-879a1e3baf12",
      "detector_type": "network",
      "score": 0.0000016306962606904563
    },
    {
      "finding": "e7dea5a1-164f-48f9-880e-4ba33e508713",
      "detector_type": "network",
      "score": 0.00001632626481296029
    }
  ]
}

Response fields

Field	Type	Description
`finding`	String	The finding ID.
`detector_type`	String	The log type associated with the finding.
`score`	Number	The correlation score for the correlated finding. The score is based on the proximity of relevant findings in the threat scenario defined by the correlation rule.

List correlation alerts

You can use the following API to list correlation alerts:

GET /_plugins/_security_analytics/correlationAlerts

Query parameters

Parameter	Type	Description
`correlation_rule_id`	String	The correlation rule ID.	Optional

Example request

GET /_plugins/_security_analytics/correlations?correlation_rule_id=VjY0MpABPzR_pcEveVRq

Example response

{
    "correlationAlerts": [
        {
            "correlated_finding_ids": [
                "4f867df9-c9cb-4dc1-84bb-6c8b575f1a54"
            ],
            "correlation_rule_id": "VjY0MpABPzR_pcEveVRq",
            "correlation_rule_name": "rule-corr",
            "user": null,
            "id": "8532c08b-3ab5-4e95-a1c2-5884c4cd41a5",
            "version": 1,
            "schema_version": 1,
            "trigger_name": "trigger1",
            "state": "ACTIVE",
            "error_message": null,
            "severity": "1",
            "action_execution_results": [],
            "start_time": "2024-06-19T20:37:08.257Z",
            "end_time": "2024-06-19T20:42:08.257Z",
            "acknowledged_time": null
        },
        {
            "correlated_finding_ids": [
                "30d2109f-76bb-44ad-8f68-6daa905e018d"
            ],
            "correlation_rule_id": "VjY0MpABPzR_pcEveVRq",
            "correlation_rule_name": "rule-corr",
            "user": null,
            "id": "8bba85d9-a7fc-4c87-b35e-a7236b87159f",
            "version": 1,
            "schema_version": 1,
            "trigger_name": "trigger1",
            "state": "ACTIVE",
            "error_message": null,
            "severity": "1",
            "action_execution_results": [],
            "start_time": "2024-06-19T20:43:08.208Z",
            "end_time": "2024-06-19T20:48:08.208Z",
            "acknowledged_time": null
        }
    ],
    "total_alerts": 2
}

Acknowledge correlation alerts

You can use the following API to acknowledge the correlation alerts.

Example request

POST /_plugins/_security_analytics/_acknowledge/correlationAlerts
{
   "alertIds": ["8532c08b-3ab5-4e95-a1c2-5884c4cd41a5", "8bba85d9-a7fc-4c87-b35e-a7236b87159f"]
}

Example response

{
    "acknowledged": [
        {
            "correlated_finding_ids": [
                "4f867df9-c9cb-4dc1-84bb-6c8b575f1a54"
            ],
            "correlation_rule_id": "VjY0MpABPzR_pcEveVRq",
            "correlation_rule_name": "rule-corr",
            "user": null,
            "id": "8532c08b-3ab5-4e95-a1c2-5884c4cd41a5",
            "version": 1,
            "schema_version": 1,
            "trigger_name": "trigger1",
            "state": "ACTIVE",
            "error_message": null,
            "severity": "1",
            "action_execution_results": [],
            "start_time": "2024-06-19T20:37:08.257Z",
            "end_time": "2024-06-19T20:42:08.257Z",
            "acknowledged_time": null
        },
        {
            "correlated_finding_ids": [
                "30d2109f-76bb-44ad-8f68-6daa905e018d"
            ],
            "correlation_rule_id": "VjY0MpABPzR_pcEveVRq",
            "correlation_rule_name": "rule-corr",
            "user": null,
            "id": "8bba85d9-a7fc-4c87-b35e-a7236b87159f",
            "version": 1,
            "schema_version": 1,
            "trigger_name": "trigger1",
            "state": "ACTIVE",
            "error_message": null,
            "severity": "1",
            "action_execution_results": [],
            "start_time": "2024-06-19T20:43:08.208Z",
            "end_time": "2024-06-19T20:48:08.208Z",
            "acknowledged_time": null
        }
    ],
    "failed": []
}

Create correlation rules between log types
- Request fields
- Response fields
List all findings and correlations within a certain time window
- Query parameters
- Response fields
List correlations for a finding belonging to a log type
- Query parameters
- Response fields
List correlation alerts
- Query parameters
Acknowledge correlation alerts
- Example request

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Correlation engine APIs

Create correlation rules between log types

Request fields

Example request

Example response

Response fields

List all findings and correlations within a certain time window

Query parameters

Example request

Example response

Response fields

List correlations for a finding belonging to a log type

Query parameters

Example request

Example response

Response fields

List correlation alerts

Query parameters

Example request

Example response

Acknowledge correlation alerts

Example request

Example response

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