suspicious-login-triage

name	suspicious-login-triage
description	Use when triaging anomalous or suspicious user authentication events, impossible travel, and credential anomalies.
category	triage
version	1.0.0
type	Skill
title	Skill: Suspicious Login Alert Triage Runbook
generated	{"by":"process:google-labs-jules","at":"2025-12-21T03:04:42.000Z"}

Suspicious Login Alert Triage Runbook

Objective

Guide the initial triage of common suspicious login alerts (e.g., Impossible Travel, Login from Untrusted Location, Multiple Failed Logins) for Tier 1 SOC Analysts.

Scope

This runbook covers the initial investigation steps to gather context about a suspicious login event, focusing on user history and source IP reputation, to help determine if escalation is needed.

Inputs

• ${CASE_ID}: The relevant SOAR case ID containing the alert(s).
• ${ALERT_GROUP_IDENTIFIERS}: Relevant alert group identifiers from the SOAR case.
• (Optional) ${ALERT_ID}: Specific Alert ID if targeting a single alert.
• (Optional) ${USER_ID}: The user ID associated with the suspicious login (if known upfront).
• (Optional) ${SOURCE_IP}: The source IP address (if known upfront).
• (Optional) ${ALERT_DETAILS}: Specific details from the alert (e.g., alert name, timestamp).

Tools

• secops-soar: get_case_full_details, list_events_by_alert, post_case_comment
• secops-mcp: lookup_entity, search_security_events
• gti-mcp: get_ip_address_report
• (Optional: Identity Provider tools like okta-mcp.lookup_okta_user)
• You may ask follow up question
• Common Steps: {doc}common_steps/enrich_ioc </run_books/common_steps/enrich_ioc>, {doc}common_steps/find_relevant_soar_case </run_books/common_steps/find_relevant_soar_case>, {doc}common_steps/document_in_soar </run_books/common_steps/document_in_soar>, {doc}common_steps/generate_report_file </run_books/common_steps/generate_report_file>

Workflow Steps & Diagram

1. Receive Input & Context: Obtain ${CASE_ID}, ${ALERT_GROUP_IDENTIFIERS} (or ${ALERT_ID}), and other optional inputs. Get full case details using soar-mcp_get_case_full_details.

2. Extract Key Entities:

   • Use soar-mcp_list_events_by_alert for the primary alert(s) in the case.
   • Parse events to reliably extract the primary ${USER_ID}, ${SOURCE_IP}, and relevant ${HOSTNAME}(s). Handle cases where these might be missing.

3. User Context (SIEM):

   • Use secops-mcp_lookup_entity with entity_value=${USER_ID}.
   • Record summary of user's recent activity, first/last seen, related alerts (USER_SIEM_SUMMARY).

4. Source IP Enrichment:

   • Execute skills/common/enrich-ioc/SKILL.md with IOC_VALUE=${SOURCE_IP} and IOC_TYPE="IP Address".
   • Obtain ${GTI_FINDINGS}, ${SIEM_ENTITY_SUMMARY} (for IP), ${SIEM_IOC_MATCH_STATUS}. Let's call these IP_GTI_FINDINGS, IP_SIEM_SUMMARY, IP_SIEM_MATCH.

5. Hostname Context (SIEM):

   • If ${HOSTNAME} was extracted:
     • Use secops-mcp_lookup_entity with entity_value=${HOSTNAME}.
     • Record summary (HOSTNAME_SIEM_SUMMARY).

6. Recent Login Activity (SIEM):

   • Use secops-mcp_search_security_events with a refined UDM query focusing on the last 24-72 hours:

     metadata.event_type IN ("USER_LOGIN", "AUTH_ATTEMPT") AND (
       principal.user.userid = "${USER_ID}" OR
       target.user.userid = "${USER_ID}" OR
       src.user.userid = "${USER_ID}"
     )
     

   • Look for patterns: logins from other unusual IPs, successful logins after failures, frequency of logins from ${SOURCE_IP} vs. others (LOGIN_ACTIVITY_SUMMARY).

ADK Graph-Based Workflow Diagram

graph TD
    START(["START"]) --> extract_entities_node["1. extract_entities_node<br/><i>(Extract User ID, Source IP, Hostname)</i>"]
    extract_entities_node --> enrich_user_node["2. enrich_user_node<br/><i>(SIEM User Context)</i>"]
    enrich_user_node --> enrich_ip_node["3. enrich_ip_node<br/><i>(GTI & SIEM IP Threat Intel)</i>"]
    enrich_ip_node --> analyze_logins_node["4. analyze_logins_node<br/><i>(72h UDM Pattern Analysis)</i>"]
    analyze_logins_node --> triage_risk_router{"5. triage_risk_router<br/><i>(Event.actions.route)</i>"}

    triage_risk_router -- "LOW_RISK_BENIGN" --> handle_low_risk_branch["6a. handle_low_risk_branch<br/><i>(Draft FP Closure Note)</i>"]
    triage_risk_router -- "HIGH_RISK_SUSPICIOUS" --> handle_high_risk_branch["6b. handle_high_risk_branch<br/><i>(Draft Escalation & Lockdown)</i>"]

    handle_low_risk_branch --> document_and_report_node["7. document_and_report_node<br/><i>(SOAR Comment & Report Summary)</i>"]
    handle_high_risk_branch --> document_and_report_node

Sequence Diagram

sequenceDiagram
    participant Analyst
    participant AutomatedAgent as Automated Agent (MCP Client)
    participant SOAR as secops-soar
    participant SIEM as secops-mcp
    participant EnrichIOC as skills/common/enrich-ioc/SKILL.md
    participant FindCase as skills/common/find-relevant-soar-case/SKILL.md
    participant DocumentInSOAR as skills/common/document-in-soar/SKILL.md
    participant GenerateReport as skills/common/generate-report-file/SKILL.md
    participant IDP as Identity Provider (Optional)

    Analyst->>AutomatedAgent: Start Suspicious Login Triage\nInput: CASE_ID, ALERT_GROUP_IDS/ALERT_ID

    %% Step 1: Context
    AutomatedAgent->>SOAR: get_case_full_details(case_id=CASE_ID)
    SOAR-->>AutomatedAgent: Case Details

    %% Step 2: Extract Key Entities
    AutomatedAgent->>SOAR: list_events_by_alert(case_id=CASE_ID, alert_id=...)
    SOAR-->>AutomatedAgent: Events
    Note over AutomatedAgent: Extract USER_ID, SOURCE_IP, HOSTNAME

    %% Step 3: User Context
    AutomatedAgent->>SIEM: lookup_entity(entity_value=USER_ID)
    SIEM-->>AutomatedAgent: User SIEM Summary (USER_SIEM_SUMMARY)

    %% Step 4: Source IP Enrichment
    AutomatedAgent->>EnrichIOC: Execute(Input: IOC_VALUE=SOURCE_IP, IOC_TYPE="IP Address")
    EnrichIOC-->>AutomatedAgent: Results: IP_GTI_FINDINGS, IP_SIEM_SUMMARY, IP_SIEM_MATCH

    %% Step 5: Hostname Context
    opt HOSTNAME extracted
        AutomatedAgent->>SIEM: lookup_entity(entity_value=HOSTNAME)
        SIEM-->>AutomatedAgent: Hostname SIEM Summary (HOSTNAME_SIEM_SUMMARY)
    end

    %% Step 6: Recent Login Activity
    Note over AutomatedAgent: Use refined UDM query
    AutomatedAgent->>SIEM: search_security_events(text="Refined Login Query for USER_ID", hours_back=72)
    SIEM-->>AutomatedAgent: Recent Login Events (LOGIN_ACTIVITY_SUMMARY)

    %% Step 7: Check Related SOAR Cases
    AutomatedAgent->>FindCase: Execute(Input: SEARCH_TERMS=[USER_ID, SOURCE_IP, HOSTNAME], CASE_STATUS_FILTER="Opened")
    FindCase-->>AutomatedAgent: Results: RELATED_SOAR_CASES

    %% Step 8: Optional IDP Check
    opt IDP Tool Available (e.g., okta-mcp)
        AutomatedAgent->>IDP: lookup_okta_user(user=USER_ID)
        IDP-->>AutomatedAgent: User Account Details from IDP (IDP_SUMMARY)
    end

    %% Step 9: Synthesize & Document
    Note over AutomatedAgent: Synthesize findings (incl. related cases, hostname) and prepare COMMENT_TEXT with Recommendation
    AutomatedAgent->>DocumentInSOAR: Execute(Input: CASE_ID, COMMENT_TEXT)
    DocumentInSOAR-->>AutomatedAgent: Results: COMMENT_POST_STATUS

    %% Step 10: Optional Report Generation
    AutomatedAgent->>AskReport: Confirm: "Generate markdown report? (Yes/No)"
    AskReport-->>AutomatedAgent: User Response (REPORT_CHOICE)
    alt REPORT_CHOICE is "Yes"
        Note over AutomatedAgent: Prepare REPORT_CONTENT (incl. Mermaid diagram)
        AutomatedAgent->>GenerateReport: Execute(Input: REPORT_CONTENT, REPORT_TYPE="suspicious_login_triage", REPORT_NAME_SUFFIX=CASE_ID)
        GenerateReport-->>AutomatedAgent: Results: REPORT_GENERATION_STATUS
    else REPORT_CHOICE is "No"
        Note over AutomatedAgent: REPORT_GENERATION_STATUS = "Skipped"
    end

    %% Step 11: Completion
    AutomatedAgent->>Analyst: attempt_completion(result="Suspicious Login Triage complete for USER_ID from SOURCE_IP. Findings documented in case CASE_ID. Report Status: REPORT_GENERATION_STATUS.")

Rubrics

The following rubric is used to evaluate the execution of the Suspicious Login Alert Triage runbook by an LLM agent.

Grading Scale (0-100 Points)

Criteria	Points	Description
Entity Extraction	20	Correctly identified the User ID, Source IP, and Hostname from the alert data.
Context Gathering	25	Retrieved comprehensive context: User history, IP reputation, and recent login patterns.
Analysis Depth	20	Performed meaningful analysis of the data (e.g., identifying impossible travel or unusual times).
Documentation	15	Synthesized findings into a clear, actionable comment in the SOAR case.
Tool Usage	5	Used the correct tools and sub-runbooks (e.g., enrich_ioc, find_relevant_soar_case).
Operational Artifacts	15	Produced required artifacts: Sequence diagram, execution metadata (date/cost), and summary.

Evaluation Criteria Details

1. Entity Extraction (20 Points)

• 10 pts: Accurately extracted the primary User ID and Source IP.
• 10 pts: Correctly identified the Hostname if present in the alert data.

2. Context Gathering (25 Points)

• 10 pts: Retrieved user summary and recent activity from SIEM (lookup_entity).
• 10 pts: Enriched the Source IP using the enrich_ioc common step (GTI + SIEM).
• 5 pts: Searched for recent login activity using a correct UDM query (search_security_events).

3. Analysis Depth (20 Points)

• 10 pts: Checked for related open SOAR cases (find_relevant_soar_case).
• 10 pts: Identified key patterns (e.g., failed vs. successful logins, geographical anomalies) in the retrieved data.

4. Documentation (15 Points)

• 10 pts: Posted a comment to the SOAR case (document_in_soar) that summarizes all key findings.
• 5 pts: Provided a clear recommendation (e.g., "Close as FP", "Escalate") based on the evidence.

5. Tool Usage (5 Points)

• 5 pts: Correctly called all specified tools and sub-runbooks with appropriate arguments, without hallucinating non-existent tools or skipping required steps.

6. Operational Artifacts (15 Points)

• 5 pts: Sequence Diagram: Produced a Mermaid sequence diagram visualizing the steps taken during execution.
• 5 pts: Execution Metadata: Recorded the date, duration, and estimated token cost of the execution.
• 5 pts: Summary Report: Generated a concise summary of the actions and outcomes.