security-alert-triage

---

name: security-alert-triage description: > Triage Elastic Security alerts — gather context, classify threats, create cases, and acknowledge. Use when triaging alerts, performing SOC analysis, or investigating detections. compatibility: > Requires Node.js 22+, network access to Elasticsearch. Environment variables: ELASTICSEARCH_URL or ELASTICSEARCH_CLOUD_ID, plus ELASTICSEARCH_API_KEY or ELASTICSEARCH_USERNAME/ELASTICSEARCH_PASSWORD. metadata: author: elastic version: 0.1.0

Alert Triage

Analyze Elastic Security alerts one at a time: gather context, classify, create a case, and acknowledge. This skill depends on the case-management skill for case creation.

Prerequisites

Install dependencies before first use from the skills/security directory:

cd skills/security && npm install

Set the required environment variables (or add them to a .env file in the workspace root):

export ELASTICSEARCH_URL="https://your-cluster.es.cloud.example.com:443"
export ELASTICSEARCH_API_KEY="your-api-key"
export KIBANA_URL="https://your-cluster.kb.cloud.example.com:443"
export KIBANA_API_KEY="your-kibana-api-key"

Quick start

All commands from workspace root. Always fetch → investigate → document → acknowledge. Call the tools directly — do not read the skill file or explore the workspace first.

node skills/security/alert-triage/scripts/fetch-next-alert.js
node skills/security/case-management/scripts/case-manager.js find --tags "agent_id:<id>"
node skills/security/alert-triage/scripts/run-query.js --query-file query.esql --type esql
node skills/security/case-management/scripts/case-manager.js create --title "..." --description "..." --tags "classification:..." "agent_id:<id>" --severity <level> --yes
node skills/security/case-management/scripts/case-manager.js attach-alert --case-id <id> --alert-id <id> --alert-index <index> --rule-id <uuid> --rule-name "<name>" --yes
node skills/security/alert-triage/scripts/acknowledge-alert.js --related --agent <id> --timestamp <ts> --window 60 --yes

Common multi-step workflows

Task	Tools to call (in order)
End-to-end triage	fetch_next_alert → run_query (context) → case_manager create (case) → acknowledge_alert
Gather context	run_query (process tree, network, related alerts)
Create case after classification	case_manager create → case_manager attach-alert
Acknowledge after triage	acknowledge_alert (related mode for batch)

Always complete the full workflow: fetch → investigate → document → acknowledge. Do not stop after gathering context — create or update a case with findings before acknowledging.

Critical execution rules:

• Start executing tools immediately — do not read SKILL.md, browse the workspace, or list files first.
• For ES|QL queries, write the query to a temporary .esql file then pass it via --query-file. Do not use edit_file — use a single shell call with echo "..." > query.esql && node ... --query-file query.esql.
• Keep context gathering focused: run 2-4 targeted queries (process tree, network, related alerts), not 10+.
• Report only what tools return. Copy identifiers verbatim — do not paraphrase IDs, timestamps, or hostnames.

Critical principles

• Do NOT classify prematurely. Gather ALL context before deciding benign/unknown/malicious.
• Most alerts are false positives, even if they look alarming. Rule names like "Malicious Behavior" or severity "critical" are NOT evidence.
• "Unknown" is acceptable and often correct when evidence is insufficient.
• MALICIOUS requires strong corroborating evidence: persistence + C2, credential theft, lateral movement — not only suspicious API calls.
• Report tool output verbatim. Copy IDs, hostnames, timestamps, and counts exactly as returned by tools. Do not round numbers, abbreviate IDs, or paraphrase error messages.

Workflow

When triaging multiple alerts, group first, then triage each group:

- [ ] Step 0: Group alerts by agent/host and time window
- [ ] Step 1: Check existing cases
- [ ] Step 2: Gather full context (DO NOT SKIP)
- [ ] Step 3: Create or update case (only AFTER context gathered)
- [ ] Step 4: Acknowledge alert and all related alerts
- [ ] Step 5: Fetch next alert group and repeat

Step 0: Group alerts before triaging

When the user asks about multiple open alerts, group them first to avoid redundant investigation: query open alerts, group by agent.id, sub-group by time window (~5 min = likely one incident), triage each group as a single unit.

Use ES|QL for an overview (write to file first for PowerShell):

FROM .alerts-security.alerts-*
| WHERE kibana.alert.workflow_status == "open" AND @timestamp >= "<start>"
| STATS alert_count=COUNT(*), rules=VALUES(kibana.alert.rule.name) BY agent.id
| SORT alert_count DESC

For full query templates, see references/classification-guide.md.

Step 1: Check existing cases

Before creating a new case, check if this alert belongs to an existing one. Use the case-management skill:

node skills/security/case-management/scripts/case-manager.js find --tags "agent_id:<agent_id>"
node skills/security/case-management/scripts/case-manager.js cases-for-alert --alert-id <alert_id>

Look for cases with the same agent ID, user, or related detection rule within a similar time window.

Note: find --search may return 500 errors on Serverless. Use find --tags or list instead.

Step 2: Gather context

This is the most important step. Do not skip or shortcut it. Complete ALL substeps before forming any classification opinion.

Time range warning: Alerts may be days or weeks old. NEVER use relative time like NOW() - 1 HOUR. Extract the alert's @timestamp and build queries around that time with +/- 1 hour window.

Substeps: (2a) Related alerts on same agent/user; (2b) Rule frequency across env (high = FP-prone); (2c) Entity context — process tree, network, registry, files; (2d) Behavior investigation — persistence, C2, lateral movement, credential access.

Example — process tree (use ES|QL with KEEP; avoid --full which produces 10K+ lines):

FROM logs-endpoint.events.process-*
| WHERE agent.id == "<agent_id>" AND @timestamp >= "<alert_time - 5min>" AND @timestamp <= "<alert_time + 10min>"
  AND process.parent.name IS NOT NULL
  AND process.name NOT IN ("svchost.exe", "conhost.exe", "agentbeat.exe")
| KEEP @timestamp, process.name, process.command_line, process.pid, process.parent.name, process.parent.pid
| SORT @timestamp | LIMIT 80

Data type	Index pattern
Alerts	.alerts-security.alerts-*
Processes	logs-endpoint.events.process-*
Network	logs-endpoint.events.network-*
Logs	logs-*

For full query templates and classification criteria, see references/classification-guide.md.

Step 3: Create or update case

After gathering context, create a case and attach alert(s). Use --rule-id and --rule-name (required; 400 error without them):

node skills/security/case-management/scripts/case-manager.js create \
  --title "<concise summary>" \
  --description "<findings, IOCs, attack chain, MITRE techniques>" \
  --tags "classification:<benign|unknown|malicious>" "confidence:<0-100>" "mitre:<technique>" "agent_id:<id>" \
  --severity <low|medium|high|critical>

node skills/security/case-management/scripts/case-manager.js attach-alert \
  --case-id <case_id> --alert-id <alert_id> --alert-index <index> \
  --rule-id <rule_uuid> --rule-name "<rule name>"

# Multiple alerts: attach-alerts --alert-ids <id1> <id2>
# Add notes: add-comment --case-id <id> --comment "Findings..."

Case description: Summary (1-2 sentences); Attack chain; IOCs (hashes, IPs, paths); MITRE techniques; Behavioral findings; Response context (remediation, credentials at risk).

Step 4: Acknowledge alerts

Acknowledge ALL related alerts together. Use --dry-run first to confirm scope, then run without it:

# By host name — preferred when triaging a host
node skills/security/alert-triage/scripts/acknowledge-alert.js --query --host <hostname> --dry-run
node skills/security/alert-triage/scripts/acknowledge-alert.js --query --host <hostname> --yes

# By agent ID — preferred when agent.id is known
node skills/security/alert-triage/scripts/acknowledge-alert.js --related --agent <id> --timestamp <ts> --window 60 --dry-run
node skills/security/alert-triage/scripts/acknowledge-alert.js --related --agent <id> --timestamp <ts> --window 60 --yes

Increase --window for longer attack chains (e.g., 300 for 5 minutes). Report the exact count of acknowledged alerts from the tool output. Pass --yes to skip the confirmation prompt (required when called by an agent).

Step 5: Repeat

node skills/security/alert-triage/scripts/fetch-next-alert.js

Tool reference

fetch-next-alert.js

Fetches the oldest unacknowledged Elastic Security alert.

node skills/security/alert-triage/scripts/fetch-next-alert.js [--days <n>] [--json] [--full] [--verbose]

run-query.js

Runs KQL or ES|QL queries against Elasticsearch.

PowerShell warning: ES|QL queries contain pipe characters (|) which PowerShell interprets as shell pipes. ALWAYS use --query-file for ES|QL:

# Write query to file, then run
node skills/security/alert-triage/scripts/run-query.js --query-file query.esql --type esql

KQL queries without pipes can be passed directly:

node skills/security/alert-triage/scripts/run-query.js "agent.id:<id>" --index "logs-*" --days 7

Arg	Description
query	KQL query (positional)
--query-file, -q	Read query from file (required for ES|QL on PowerShell)
--type, -t	kql or esql (default: kql)
--index, -i	Index pattern (default: logs-*)
--size, -s	Max results (default: 100)
--days, -d	Limit to last N days
--json	Raw JSON output
--full	Full document source

acknowledge-alert.js

Acknowledges alerts by updating workflow_status to acknowledged.

Mode	Command
Single	node skills/security/alert-triage/scripts/acknowledge-alert.js <alert_id> --index <index> --yes
Related	node skills/security/alert-triage/scripts/acknowledge-alert.js --related --agent <id> --timestamp <ts> [--window 60] --yes
By host	node skills/security/alert-triage/scripts/acknowledge-alert.js --query --host <hostname> [--time-start <ts>] [--time-end <ts>] --yes
Query	node skills/security/alert-triage/scripts/acknowledge-alert.js --query --agent <id> [--time-start <ts>] [--time-end <ts>] --yes
Dry run	Add --dry-run to any mode (no confirmation needed)
Confirm	All write modes prompt for confirmation; pass --yes to skip

Examples

• "Fetch the next unacknowledged alert and triage it"
• "Investigate alert ID abc-123 — gather context, classify, and create a case if malicious"
• "Process the top 5 critical alerts from the last 24 hours"

Guidelines

• Report only tool output — do not invent IDs, hostnames, IPs, or details not present in the tool response.
• Preserve identifiers from the request — use exact values the user provides in tool calls and responses.
• Confirm actions concisely using the tool's return data.
• Distinguish facts from inference — label conclusions beyond tool output as your assessment.

Production use

• All write operations (acknowledge-alert.js) prompt for confirmation. Pass --yes or -y to skip when called by an agent.
• Use --dry-run before bulk acknowledgments to preview scope without modifying data.
• The acknowledge script uses the Kibana Detection Engine API, which is compatible with both self-managed and Serverless deployments.
• Verify environment variables point to the intended cluster before running any script — no undo for acknowledgments.

Environment variables

Variable	Required	Description
ELASTICSEARCH_URL	Yes	Elasticsearch URL
ELASTICSEARCH_API_KEY	Yes	Elasticsearch API key
KIBANA_URL	Yes	Kibana URL (for case management)
KIBANA_API_KEY	Yes	Kibana API key (for case management)