Must-Know Cybersecurity & OSINT Tools

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In the fast-paced world of cybersecurity, having the right tools can make all the difference. Whether you’re hunting threats, analyzing malware, or mapping attack surfaces, these tools can help you stay ahead.

🔹 GreyNoise – Cuts through the noise by filtering out harmless internet scans so security teams can focus on real threats.
🔹 Censys – Like Google for cybersecurity, it scans the internet to find exposed devices, open ports, and vulnerabilities.
🔹 CyberGreen – Think of it as a cybersecurity health check for the internet, helping organizations measure and reduce global cyber risks.
🔹 Hunter – A go-to tool for finding email addresses linked to a domain—useful for OSINT investigations and security research.
🔹 ANY.RUN – A hands-on malware sandbox where you can analyze suspicious files and URLs in real time.
🔹 Intelligence X – A search engine for leaked data and dark web intelligence—great for investigating breaches and exposed credentials.
🔹 Security Headers – Quickly checks if a website is using proper HTTP security headers to prevent attacks like XSS and clickjacking.
🔹 Pulsedive – A free threat intelligence platform that helps analysts track malicious IPs, domains, and URLs.
🔹 DNSDumpster – A simple but powerful reconnaissance tool for mapping an organization’s external attack surface.
🔹 SpiderFoot – Automates OSINT gathering, pulling in data from hundreds of sources to uncover threats, leaks, and vulnerabilities.

You Should Know:

1. GreyNoise – Filtering Internet Noise

  • Command to Query GreyNoise API (Linux):
    curl -X GET "https://api.greynoise.io/v3/community/8.8.8.8" -H "accept: application/json"
    
  • Use Case: Identify if an IP is part of benign internet scanning or a real threat.

2. Censys – Internet-Wide Scanning

  • Search for Exposed Services:
    censys search "services.port: 22 AND location.country: US" --index=ipv4
    
  • Install Censys CLI:
    pip install censys
    

3. ANY.RUN – Malware Sandbox

  • Submit a Suspicious File via API:
    curl -X POST "https://api.any.run/v1/analysis" -H "Authorization: Bearer YOUR_API_KEY" -F "[email protected]"
    
  • Analyze Behavior: Use the interactive sandbox to monitor malware execution.

4. SpiderFoot – OSINT Automation

  • Run a Basic Scan:
    python3 sf.py -s example.com -m all
    
  • Installation:
    git clone https://github.com/smicallef/spiderfoot.git 
    cd spiderfoot 
    pip3 install -r requirements.txt 
    

5. DNSDumpster – Reconnaissance

  • Alternative CLI Tool (dnsrecon):
    dnsrecon -d example.com -t std,axfr,bing
    
  • Check DNS Records:
    dig example.com ANY
    

6. Security Headers – HTTP Security Check

  • Curl Command to Check Headers:
    curl -I https://example.com
    
  • Analyze Headers for Vulnerabilities:
    nmap --script http-security-headers -p 443 example.com
    

7. Intelligence X – Leak Search

  • Search via API:
    curl -X POST "https://api.intelx.io/search" -H "x-key: YOUR_API_KEY" -d '{"term":"[email protected]"}'
    

8. Pulsedive – Threat Intelligence

  • Query Threat Indicators:
    curl "https://pulsedive.com/api/info.php?indicator=malicious-domain.com"
    

9. Hunter – Email Discovery

  • Python Script to Fetch Emails:
    import requests 
    response = requests.get("https://api.hunter.io/v2/domain-search?domain=example.com&api_key=YOUR_KEY") 
    print(response.json()) 
    

10. CyberGreen – Risk Measurement

  • Check ASN Health:
    curl "https://api.cybergreen.net/v1/risk/by_asn?asn=12345"
    

What Undercode Say:

Cybersecurity professionals must leverage these tools to enhance threat detection and response. Automation with APIs and CLI tools (like curl, nmap, and dnsrecon) improves efficiency. Always verify findings with multiple sources—combining Censys with GreyNoise reduces false positives, while ANY.RUN provides real-time malware insights. For OSINT, SpiderFoot and Hunter streamline investigations.

Bonus Commands for Cybersecurity:

  • Network Traffic Analysis:
    tcpdump -i eth0 -w capture.pcap
    
  • Check Open Ports:
    nmap -sV -T4 example.com
    
  • Extract Malware Strings:
    strings malware.exe | grep "http"
    
  • Analyze SSL/TLS:
    openssl s_client -connect example.com:443 | openssl x509 -text
    

Expected Output:

A structured cybersecurity workflow integrating these tools ensures robust defense. Start with reconnaissance (DNSDumpster), validate threats (GreyNoise), analyze malware (ANY.RUN), and track leaks (Intelligence X).

Relevant URLs:

References:

Reported By: Rohan Savani – Hackers Feeds
Extra Hub: Undercode MoN
Basic Verification: Pass ✅

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