Slack DLP Modified

AnalysisType: rule
Filename: slack_dlp_modified.py
RuleID: "Slack.AuditLogs.DLPModified"
DisplayName: "Slack DLP Modified"
Enabled: true
LogTypes:
  - Slack.AuditLogs
Tags:
  - Slack
  - Defense Evasion
  - Impair Defenses
  - Disable or Modify Tools
  - Indicator Removal
Reports:
  MITRE ATT&CK:
    - TA0005:T1562.001
    - TA0005:T1070
Severity: High
Description: >
  Detects when a Data Loss Prevention (DLP) rule has been deactivated or a violation has been deleted
Reference: https://slack.com/intl/en-gb/help/articles/12914005852819-Slack-Connect--Data-loss-prevention
DedupPeriodMinutes: 60
Threshold: 1
SummaryAttributes:
  - action
  - p_any_ip_addresses
  - p_any_emails
Tests:
  - Name: Native DLP Rule Deactivated
    ExpectedResult: true
    Log:
      {
        "action": "native_dlp_rule_deactivated",
        "actor":
          {
            "type": "user",
            "user":
              {
                "email": "user@example.com",
                "id": "A012B3CDEFG",
                "name": "username",
                "team": "T01234N56GB",
              },
          },
        "context":
          {
            "ip_address": "1.2.3.4",
            "location":
              {
                "domain": "test-workspace",
                "id": "T01234N56GB",
                "name": "test-workspace",
                "type": "workspace",
              },
            "ua": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36",
          },
      }
  - Name: Native DLP Violation Deleted
    ExpectedResult: true
    Log:
      {
        "action": "native_dlp_violation_deleted",
        "actor":
          {
            "type": "user",
            "user":
              {
                "email": "user@example.com",
                "id": "A012B3CDEFG",
                "name": "username",
                "team": "T01234N56GB",
              },
          },
        "context":
          {
            "ip_address": "1.2.3.4",
            "location":
              {
                "domain": "test-workspace",
                "id": "T01234N56GB",
                "name": "test-workspace",
                "type": "workspace",
              },
            "ua": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36",
          },
      }
  - Name: User Logout
    ExpectedResult: false
    Log:
      {
        "action": "user_logout",
        "actor":
          {
            "type": "user",
            "user":
              {
                "email": "user@example.com",
                "id": "W012J3FEWAU",
                "name": "primary-owner",
                "team": "T01234N56GB",
              },
          },
        "context":
          {
            "ip_address": "1.2.3.4",
            "location":
              {
                "domain": "test-workspace-1",
                "id": "T01234N56GB",
                "name": "test-workspace-1",
                "type": "workspace",
              },
            "ua": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36",
          },
        "date_create": "2022-07-28 15:22:32",
        "entity":
          {
            "type": "user",
            "user":
              {
                "email": "user@example.com",
                "id": "W012J3FEWAU",
                "name": "primary-owner",
                "team": "T01234N56GB",
              },
          },
        "id": "72cac009-9eb3-4dde-bac6-ee49a32a1789",
      }


# ------ paired body: slack_dlp_modified.py ------

from panther_slack_helpers import slack_alert_context

DLP_ACTIONS = [
    "native_dlp_rule_deactivated",
    "native_dlp_violation_deleted",
]


def rule(event):
    return event.get("action") in DLP_ACTIONS


def title(event):
    if event.get("action") == "native_dlp_rule_deactivated":
        return "Slack DLP Rule Deactivated"
    return "Slack DLP Violation Deleted"


# DLP violations can be removed by security engineers in the case of FPs
# We still want to alert on these, however those should not constitute a High severity
def severity(event):
    if event.get("action") == "native_dlp_violation_deleted":
        return "Medium"
    return "High"


def alert_context(event):
    return slack_alert_context(event)