Wiz Rule Change

AnalysisType: rule
RuleID: Wiz.Rule.Change
Description: This rule detects creations, updates and deletions of Wiz rules.
DisplayName: Wiz Rule Change
Runbook: Verify that this change was planned. If not, revert the change and ensure this doesn't happen again. If needed, review the privileges of existing accounts.
Reference: https://www.wiz.io/blog/custom-runtime-rules-and-response-policies
Enabled: true
Filename: wiz_rule_change.py
Severity: Medium
Reports:
  MITRE ATT&CK:
    - TA0005:T1562.001  # Impair Defenses: Disable or Modify Tools
LogTypes:
  - Wiz.Audit
DedupPeriodMinutes: 60
Threshold: 1
Tests:
  - Name: DeleteCloudConfigurationRule
    ExpectedResult: true
    Log:
      {
        "action": "DeleteCloudConfigurationRule",
        "actionparameters": {
          "input": {
            "id": "12345-3fd7-4063-8e06-12345"
          },
          "selection": [
            "__typename",
            "_stub"
          ]
        },
        "id": "12345-0301-491d-9fe6-12345",
        "log_type": "auditLogEntries",
        "requestid": "12345-c18f-4ce0-9288-12345",
        "serviceaccount": null,
        "sourceip": "8.8.8.8",
        "status": "SUCCESS",
        "timestamp": "2024-03-24 10:58:31.347",
        "user": {
          "id": "testy@company.com",
          "name": "testy@company.com"
        },
        "useragent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36"
      }
  - Name: CreateUser
    ExpectedResult: false
    Log:
      {
        "id": "220d23be-f07c-4d97-b4a6-87ad04eddb14",
        "action": "CreateUser",
        "requestId": "0d9521b2-c3f8-4a73-bf7c-20257788752e",
        "status": "SUCCESS",
        "timestamp": "2024-07-29T09:40:15.66643Z",
        "actionParameters": {
          "input": {
            "assignedProjectIds": null,
            "email": "testy@company.com",
            "expiresAt": null,
            "name": "Test User",
            "role": "GLOBAL_ADMIN"
          },
          "selection": [
            "__typename",
            {
              "user": [
                "__typename",
                "id"
              ]
            }
          ]
        },
        "userAgent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36",
        "sourceIP": "8.8.8.8",
        "serviceAccount": null,
        "user": {
          "id": "someuser@company.com",
          "name": "someuser@company.com"
        }
      }
  - Name: DeleteCloudConfigurationRule - Fail
    ExpectedResult: false
    Log:
      {
        "action": "DeleteCloudConfigurationRule",
        "id": "12345-0301-491d-9fe6-12345",
        "log_type": "auditLogEntries",
        "requestid": "12345-c18f-4ce0-9288-12345",
        "serviceaccount": null,
        "sourceip": "8.8.8.8",
        "status": "FAILED",
        "timestamp": "2024-03-24 10:58:31.347",
        "user": {
          "id": "testy@company.com",
          "name": "testy@company.com"
        },
        "useragent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36"
      }


# ------ paired body: wiz_rule_change.py ------

from panther_wiz_helpers import wiz_actor, wiz_alert_context, wiz_success

SUSPICIOUS_ACTIONS = [
    "DeleteAutomationRule",
    "UpdateAutomationRule",
    "DeleteCloudEventRule",
    "UpdateCloudEventRule",
    "DeleteCloudConfigurationRule",
    "UpdateCloudConfigurationRule",
    "DeleteHostConfigurationRule",
    "UpdateHostConfigurationRule",
    "CreateIgnoreRule",
    "DeleteIgnoreRule",  # we have no sample log for such event, but I suppose there should be one
    "UpdateIgnoreRule",
    "CreateMalwareExclusion",
    "UpdateMalwareExclusion",
]


def rule(event):
    if not wiz_success(event):
        return False
    return event.get("action", "ACTION_NOT_FOUND") in SUSPICIOUS_ACTIONS


def title(event):
    actor = wiz_actor(event)

    return (
        f"[Wiz]: [{event.get('action', 'ACTION_NOT_FOUND')}] action "
        f"performed by {actor.get('type')} [{actor.get('name')}]"
    )


def dedup(event):
    return event.get("id")


def alert_context(event):
    return wiz_alert_context(event)


def severity(event):
    action = event.get("action", "ACTION_NOT_FOUND")
    if "Delete" in action:
        return "High"
    if "Create" in action:
        return "Low"
    return "Default"