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Introduction:
Atomic Red Team is an open-source library of discrete, focused tests designed to validate an organization’s security controls against real-world adversary behaviors. By mapping each test to the MITRE ATT&CK framework, security teams can systematically assess detection, prevention, and response capabilities without the complexity of full-scale breach simulations.
Learning Objectives:
- Deploy and configure the Atomic Red Team framework on both Windows and Linux endpoints.
- Execute atomic tests to simulate specific TTPs (Tactics, Techniques, and Procedures) from real adversaries.
- Analyze detection gaps and implement hardened monitoring rules, including SIEM tuning and endpoint hardening.
You Should Know:
- Setting Up Atomic Red Team on Windows and Linux
Atomic Red Team is primarily delivered as a set of YAML test definitions and a PowerShell execution module. For Windows, the recommended approach uses the `Invoke-AtomicTest` PowerShell module. For Linux, tests can be run natively via bash scripts or using the Python-based `atomic-red-team` runner.
Step‑by‑step guide – Windows:
Launch PowerShell as Administrator Set-ExecutionPolicy Bypass -Scope Process -Force Install the Atomic Red Team module from PowerShell Gallery Install-Module -Name AtomicRedTeam -Force -AllowClobber Import the module and set up the test library Import-Module AtomicRedTeam Get-AtomicTechnique -Path C:\AtomicRedTeam\atomics List available techniques Clone the full atomic test repository (if not automatically downloaded) git clone https://github.com/redcanaryco/atomic-red-team.git C:\AtomicRedTeam
Step‑by‑step guide – Linux:
Clone the repository sudo git clone https://github.com/redcanaryco/atomic-red-team.git /opt/atomic-red-team Install dependencies (Python 3 required) sudo apt update && sudo apt install -y python3-pip pip3 install atomic-red-team Community Python wrapper Run a simple test (e.g., T1059 – Command and Scripting Interpreter) cd /opt/atomic-red-team/atomics/T1059 chmod +x T1059.sh ./T1059.sh
- Executing Your First Atomic Test – Simulating TTPs
Atomic tests are categorized by MITRE ATT&CK technique IDs. A common starting point is T1059.001 (PowerShell) to test script-block logging and AMSI.
Windows – Execute a PowerShell-based atomic test:
List all tests for T1059.001 Get-AtomicTechnique -Technique T1059.001 Run test number 1 (Create and execute a simple PowerShell payload) Invoke-AtomicTest T1059.001 -TestNumbers 1 -ExecutionLogPath C:\Logs\atomic_execution.json
Linux – Simulate persistence via crontab (T1053.003):
Navigate to the technique folder cd /opt/atomic-red-team/atomics/T1053.003 Review the test YAML to understand what it does cat T1053.003.yaml | grep -A5 "executor" Execute the bash test (ensure you have a test environment) bash T1053.003.sh This adds a test cron job that echoes to /tmp/atomic_test.txt
Verifying detection: After execution, check Windows Event IDs 4104 (PowerShell logging) and 4688 (process creation) using:
Get-WinEvent -FilterHashtable @{LogName='Microsoft-Windows-PowerShell/Operational'; ID=4104} | Select-Object -First 5
On Linux, monitor auditd logs:
sudo ausearch -m EXECVE -ts recent | grep -i "cron"
3. Interpreting Results and Tuning SIEM/Alerts
Running atomic tests produces both expected and unexpected outcomes. A “successful” test means the adversary action completed – but your security stack should have alerted. Use the execution logs to map missing detections.
Parse JSON logs on Windows (PowerShell):
$results = Get-Content -Path C:\Logs\atomic_execution.json | ConvertFrom-Json
$results | Where-Object { $_.ExecutionStatus -eq "Success" } | Format-Table Technique, TestNumber
SIEM tuning recommendation: For each missed test, create a detection rule. Example: Sigma rule for unusual PowerShell download cradle:
title: Atomic Test T1059.001 - PowerShell Download Cradle logsource: product: windows service: powershell detection: selection: EventID: 4104 ScriptBlockText|contains: 'Invoke-Expression (New-Object Net.WebClient).DownloadString' condition: selection
Linux – Enable process auditing:
sudo auditctl -a always,exit -F arch=b64 -S execve -k atomic_test sudo ausearch -k atomic_test --format raw | aureport -i
- Extending Atomic Tests for Cloud and API Security
Atomic Red Team includes a growing set of cloud-focused techniques. For AWS, you can simulate IAM privilege escalation or S3 bucket enumeration.
Prerequisites: Install AWS CLI and configure test credentials (isolated account only).
pip3 install atomic-red-team[bash]
Example: Test T1530 – Data from Cloud Storage Object (S3 bucket listing)
Navigate to cloud test folder cd /opt/atomic-red-team/atomics/T1530 Export AWS profile (use a sandbox) export AWS_PROFILE=atomic-test Run the test – attempts to list public buckets python3 T1530.py --region us-east-1
API security test (Linux with curl): Simulate JWT manipulation (T1550.001)
Using a test JWT from atomic-red-team/atomics/T1550/T1550.yaml curl -X GET "https://api.yourlab.com/admin" -H "Authorization: Bearer eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9.eyJhZG1pbiI6dHJ1ZX0.xxx" --insecure
If the endpoint returns 200 without proper validation, your API gateway is vulnerable.
Cloud hardening: After testing, restrict S3 bucket policies:
aws s3api put-bucket-policy --bucket vulnerable-bucket --policy file://deny-public.json
Where `deny-public.json` contains:
{
"Statement": [{
"Effect": "Deny",
"Principal": "",
"Action": "s3:GetObject",
"Resource": "arn:aws:s3:::vulnerable-bucket/",
"Condition": {"Bool": {"aws:SecureTransport": "false"}}
}]
}
5. Mitigation Strategies Based on Test Findings
Atomic tests expose missing controls. Use these commands to harden systems against common TTPs.
Windows – Block PowerShell download cradles (T1059.001):
Set PowerShell execution policy to RemoteSigned for all users Set-ExecutionPolicy RemoteSigned -Scope LocalMachine -Force Enable Script Block Logging and Transcription Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\PowerShell\ScriptBlockLogging" -Name EnableScriptBlockLogging -Value 1 Set-ItemProperty -Path "HKLM:\SOFTWARE\Policies\Microsoft\Windows\PowerShell\Transcription" -Name EnableTranscripting -Value 1
Linux – Prevent cron persistence (T1053.003):
Restrict cron to authorized users only echo "root" > /etc/cron.allow chmod 600 /etc/cron.allow Monitor crontab modifications with auditd sudo auditctl -w /etc/crontab -p wa -k cron_mod sudo auditctl -w /var/spool/cron/ -p wa -k cron_spool
Network mitigation for API abuse: Deploy a Web Application Firewall rule to reject requests with malformed JWT claims (e.g., using ModSecurity):
SecRule REQUEST_HEADERS:Authorization "Bearer [^.]+.[^.]+.[^.]$" \ "id:1001,phase:1,deny,status:401,msg:'Suspicious JWT format'"
What Undercode Say:
- Atomic Red Team bridges the gap between threat intelligence and defensive validation – every blue team should run these tests biweekly.
- The open-source nature means community-driven TTP updates, but ensure you isolate test environments; atomic tests can cause real system changes.
- Integrating atomic tests into CI/CD pipelines (e.g., GitHub Actions with
Invoke-AtomicTest) enables continuous security control validation. - Most failures originate from misconfigured logging, not missing EDR; use the provided Windows Event IDs and Linux audit rules to verify telemetry.
- For cloud and API security, combine atomic tests with cloud security posture management (CSPM) tools for full coverage.
Prediction:
As adversarial TTPs evolve faster than signature-based defenses, automated atomic testing will become a mandatory compliance requirement (similar to vulnerability scanning). Within two years, expect major cloud providers to bundle Atomic Red Team as a native “security control testing” service, and regulatory frameworks like PCI-DSS v5.0 will explicitly require quarterly atomic test execution. The shift from reactive patching to proactive simulation will redefine SOC maturity metrics – detection rates will be measured by atomic test pass/fail rather than theoretical threat coverage.
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