Detection Rules

A detection rule is a query that runs continuously on new logs as they arrive in Scanner. You can create create, read, update, and delete detection rules with the Scanner API.

Create a new detection rule

POST /v1/detection_rule

Create a new detection rule with the specified data.

If the detection rule is active, it will be immediately scheduled for backfill and execution.

Body

NameTypeDescription

tenant_id required

string

Unique identifier for the tenant

name required

string

Name of the detection rule

description required

string

Description of the detection rule

time_range_s required

Lookback period (in seconds)

run_frequency_s required

How frequently to run the detection rule (in seconds)

enabled required

boolean

Whether the detection rule is enabled

severity required

The severity of the detection

query_text required

string

Query for the detection rule

event_sink_ids required

list of strings

Event sinks to send event alerts to

sync_key

string

Sync key, used by automatic detection rule syncers

Example

curl $API_BASE/v1/detection_rule \
-H "Authorization: Bearer $SCANNER_API_KEY" \
-H "Content-Type: application/json" \
-X POST \
-d '{
    "tenant_id": "00000000-0000-0000-0000-000000000000",
    "name": "Errors",
    "description": "Errors in application logs",
    "time_range_s": 300,
    "run_frequency_s": 300,
    "enabled": true,
    "severity": "Informational",
    "query_text": "error | count | where @q.count > 100",
    "event_sink_ids": []
}'

Response

Returns the newly created detection rule.

{
  "detection_rule": {
    "id": "d87284f8-b0f3-4464-9ba9-258c0e585d09",
    "sync_key": null,
    "prepared_query_id": "b8aa9bb6-de1e-4ef8-82bb-29974a1e4ff2",
    "query_text": "error | count | where @q.count > 100",
    "tenant_id": "00000000-0000-0000-0000-000000000000",
    "time_range_s": 300,
    "run_frequency_s": 300,
    "author_user_id": null,
    "name": "Errors",
    "description": "Errors in application logs",
    "enabled": true,
    "severity": "Informational",
    "created_at": "2024-05-09T01:07:24Z",
    "updated_at": "2024-05-09T01:07:24Z",
    "event_sink_ids": [],
    "last_alerted_at": null
  }
}

List detection rules

GET /v1/detection_rule

List all detection rules for a tenant.

Body

NameTypeDescription

tenant_id required

string

Unique identifier for the tenant

Example

curl $API_BASE/v1/detection_rule \
-H "Authorization: Bearer $SCANNER_API_KEY" \
-H "Content-Type: application/json" \
-X GET \
-d '{ "tenant_id": "00000000-0000-0000-0000-000000000001" }'

Response

Returns a list of detection rule summaries. The detection rule summary object is the same as the detection rule object, but it does not include event_sink_ids.

{
  "detection_rules": [
    {
      "id": "d87284f8-b0f3-4464-9ba9-258c0e585d09",
      "sync_key": null,
      "prepared_query_id": "b8aa9bb6-de1e-4ef8-82bb-29974a1e4ff2",
      "query_text": "error | count | where @q.count > 100",
      "tenant_id": "00000000-0000-0000-0000-000000000000",
      "time_range_s": 300,
      "run_frequency_s": 300,
      "author_user_id": null,
      "name": "Errors",
      "description": "Errors in application logs",
      "enabled": true,
      "severity": "Informational",
      "created_at": "2024-05-09T01:07:24Z",
      "updated_at": "2024-05-09T01:07:24Z",
      "last_alerted_at": null
    }
  ]
}

Get a detection rule

GET /v1/detection_rule/{id}

Get the detection rule with the given id.

Example

curl $API_BASE/v1/detection_rule/d87284f8-b0f3-4464-9ba9-258c0e585d09 \
-H "Authorization: Bearer $SCANNER_API_KEY" \
-H "Content-Type: application/json" \
-X GET

Response

Returns the detection rule.

{
  "detection_rule": {
    "id": "d87284f8-b0f3-4464-9ba9-258c0e585d09",
    "sync_key": null,
    "prepared_query_id": "b8aa9bb6-de1e-4ef8-82bb-29974a1e4ff2",
    "query_text": "error | count | where @q.count > 100",
    "tenant_id": "00000000-0000-0000-0000-000000000000",
    "time_range_s": 300,
    "run_frequency_s": 300,
    "author_user_id": null,
    "name": "Errors",
    "description": "Errors in application logs",
    "enabled": true,
    "severity": "Informational",
    "created_at": "2024-05-09T01:07:24Z",
    "updated_at": "2024-05-09T01:07:24Z",
    "event_sink_ids": [],
    "last_alerted_at": null
  }
}

Update a detection rule

PUT /v1/detection_rule/{id}

Update the detection rule with the given id.

Body

NameTypeDescription

id required

string

Unique identifier for the detection rule

name

string

Update the name of the detection rule

description

string

Update the description of the detection rule

time_range_s

Update the lookback period of the detection rule

run_frequency_s

Update the how frequently the detection rule is run

enabled

boolean

Enable or disable the detection rule

severity

Update the severity of the detection rule

query_text

string

Update the query for the detection rule

event_sink_ids

list of strings

Update the event sinks for the detection rule

sync_key

string

Update the sync key for the detection rule

Example

curl $API_BASE/v1/detection_rule/d87284f8-b0f3-4464-9ba9-258c0e585d09 \
-H "Authorization: Bearer $SCANNER_API_KEY" \
-H "Content-Type: application/json" \
-X PUT \
-d '{
    "id": "d87284f8-b0f3-4464-9ba9-258c0e585d09",
    "description": "Detect errors in application logs"
}'

Response

Returns the updated detection rule.

{
  "detection_rule": {
    "id": "d87284f8-b0f3-4464-9ba9-258c0e585d09",
    "sync_key": null,
    "prepared_query_id": "b8aa9bb6-de1e-4ef8-82bb-29974a1e4ff2",
    "query_text": "error | count | where @q.count > 100",
    "tenant_id": "00000000-0000-0000-0000-000000000000",
    "time_range_s": 300,
    "run_frequency_s": 300,
    "author_user_id": null,
    "name": "Errors",
    "description": "Detect errors in application logs",
    "enabled": true,
    "severity": "Informational",
    "created_at": "2024-05-09T01:07:24Z",
    "updated_at": "2024-05-09T01:07:24Z",
    "event_sink_ids": [],
    "last_alerted_at": null
  }
}

Delete a detection rule

DELETE /v1/detection_rule/{id}

Delete the detection rule with the given id.

Example

curl $API_BASE/v1/detection_rule/123e4567-e89b-12d3-a456-426614174000 \
-H "Authorization: Bearer $SCANNER_API_KEY" \
-H "Content-Type: application/json" \
-X DELETE

Response

Returns the id and tenant_id for the deleted detection rule.

{
  "id": "d87284f8-b0f3-4464-9ba9-258c0e585d09",
  "tenant_id": "00000000-0000-0000-0000-000000000000"
}

Time range and run frequency

time_range_s is the lookback period for the detection rule and run_frequency_s is how often the detection rule is run. Valid values for time_range_s and run_frequency_s are:

  • 60 (1 minute)

  • 300 (5 minutes)

  • 900 (15 minutes)

  • 3600 (1 hour)

  • 21600 (6 hours)

  • 86400 (24 hours)

run_frequency_s is at most two levels below time_range_s. For example, if time_range_s is 300, valid values for run_frequency_s are 60, 300, and 900.

Detection severity

We use the OCSF schema for detection severity:

  • Unknown

  • Information

  • Low

  • Medium

  • High

  • Critical

  • Fatal

  • Other

The detection severity must be one of these string values, e.g.

"severity": "Critical"
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