# IR-3_incident-response-testing

> Test the effectiveness of the incident response capability for the system [organization-defined] using the following tests: [organization-defined].

- Skill: `cyberstrikeus/ir-3-incident-response-testing` (Agent Skill)
- Install (CLI): `npx skillmds@latest add cyberstrikeus/ir-3-incident-response-testing`
- Raw SKILL.md: https://api.skillmd.com/api/skills/cyberstrikeus/ir-3-incident-response-testing/raw
- Safety review: PASS (external: skill-scanner PASS, skillspector PASS)
- Works with: Claude Code, Claude.ai, OpenAI Codex
- Category: Coding & Dev Tools
- Author: cyberstrikeus (https://skillmd.com/u/cyberstrikeus)
- Updated: 2026-09-17
- Page: https://skillmd.com/skills/cyberstrikeus/ir-3-incident-response-testing

---


# IR-3 Incident Response Testing

## High-Level Description

**Family:** Incident Response (IR)
**Framework:** NIST SP 800-53 Rev 5

Organizations test incident response capabilities to determine their effectiveness and identify potential weaknesses or deficiencies. Incident response testing includes the use of checklists, walk-through or tabletop exercises, and simulations (parallel or full interrupt). Incident response testing can include a determination of the effects on organizational operations and assets and individuals due to incident response. The use of qualitative and quantitative data aids in determining the effectiveness of incident response processes.

## What to Check

- [ ] Verify IR-3 Incident Response Testing is documented in SSP
- [ ] Confirm control is operating effectively
- [ ] Review evidence of continuous monitoring for IR-3

## How to Test

### Step 1: Review Documentation

Examine the System Security Plan (SSP) and related artifacts for IR-3 implementation details. Verify the organization has documented how this control is satisfied.

### Step 2: Validate Implementation

```
# For cloud environments, use cloud-audit-mcp tools
# For on-premises, review system configurations directly

# Example: Check if account management policies exist
grep -r "account.management\|access.control" /etc/security/ 2>/dev/null
```

### Step 3: Test Operating Effectiveness

Verify the control is actively functioning, not just documented. Check logs, configurations, and operational evidence.

## Tools

| Tool          | Purpose                           | Usage |
| ------------- | --------------------------------- | ----- |
| Manual Review | Documentation and interview-based | N/A   |

## Remediation Guide

### Control Statement

Test the effectiveness of the incident response capability for the system [organization-defined] using the following tests: [organization-defined].

### Implementation Guidance

Organizations test incident response capabilities to determine their effectiveness and identify potential weaknesses or deficiencies. Incident response testing includes the use of checklists, walk-through or tabletop exercises, and simulations (parallel or full interrupt). Incident response testing can include a determination of the effects on organizational operations and assets and individuals due to incident response. The use of qualitative and quantitative data aids in determining the effectiveness of incident response processes.

## Risk Assessment

| Finding                                        | Severity | Impact                       |
| ---------------------------------------------- | -------- | ---------------------------- |
| IR-3 Incident Response Testing not implemented | Medium   | Incident Response            |
| IR-3 partially implemented                     | Low      | Incomplete Incident Response |

## CWE Categories

| CWE ID | Title                 |
| ------ | --------------------- |
| N/A    | No direct CWE mapping |

## References

- [NIST SP 800-53 Rev 5 - IR-3](https://csrc.nist.gov/projects/cprt/catalog#/cprt/framework/version/SP_800_53_5_1_1/home?element=ir-3)
- [NIST SP 800-53A Rev 5 (Assessment Procedures)](https://csrc.nist.gov/pubs/sp/800/53/a/r5/final)
- [NIST SP 800-53 Rev 5 Full Catalog](https://csrc.nist.gov/pubs/sp/800/53/r5/upd1/final)

## Checklist

- [ ] Control documented in SSP
- [ ] Implementation evidence collected
- [ ] Operating effectiveness validated
- [ ] Continuous monitoring in place
- [ ] Related controls (CP-3, CP-4, IR-2, IR-4, IR-8) reviewed