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Reference Library

Resources

A curated collection of cybersecurity reference sites, frameworks, vulnerability databases, OSINT sources and practical tools — grouped by use case.

Frameworks & Standards

MITRE ATT&CK Adversary tactics, techniques and procedures (TTPs) used in real attacks MITRE D3FEND Defensive countermeasures mapped against ATT&CK techniques MITRE CAR Cyber Analytics Repository — detection analytics aligned with ATT&CK NIST CSF 2.0 Cybersecurity Framework — Govern, Identify, Protect, Detect, Respond, Recover NIST SP 800-61 Rev 3 Computer Security Incident Handling Guide — the authoritative IR reference OWASP Top 10 The ten most critical web application security risks CIS Controls Prioritised set of actions for cyber defence — v8 ISO/IEC 27001 International standard for information security management systems ENISA Threat Landscape Annual EU threat landscape report covering top threats, actors and trends

Threat Intelligence

AlienVault OTX Open Threat Exchange — community-driven IoC sharing platform Shodan Search engine for internet-connected devices and exposed services GreyNoise Distinguishes targeted attacks from internet background noise — reduces alert fatigue URLhaus Malware distribution URLs tracked by abuse.ch MalwareBazaar Malware sample repository and sharing platform ThreatFox IOC sharing platform by abuse.ch — indicators searchable by malware family Feodo Tracker Botnet C2 infrastructure tracking — block lists for Emotet, QakBot, Cobalt Strike Malpedia Malware family knowledge base — samples, YARA rules, threat actor mapping AbuseIPDB Community database of IPs reported for abusive behaviour ransomware.live Real-time ransomware victim tracking across all major groups

Vulnerability Databases

NIST NVD National Vulnerability Database — authoritative CVE enrichment CISA KEV Catalog Known Exploited Vulnerabilities — mandatory patch list for U.S. agencies FIRST EPSS Exploit Prediction Scoring System — probability a CVE will be exploited in the wild AttackerKB Community exploitability assessments and vulnerability prioritization research Exploit Database Public exploit archive maintained by Offensive Security Vulners Full-text vulnerability search across NVD, exploits, advisories and patches CVE Details CVE statistics, vendor and product vulnerability history CVSS Calculator Official FIRST CVSS v3.1 base score calculator

Tools & References

CyberChef Browser-based data transformation and analysis tool (GCHQ) VirusTotal File, URL and IP reputation scanning across 70+ AV engines ANY.RUN Interactive online malware sandbox and analysis environment Hybrid Analysis Free automated malware analysis powered by CrowdStrike Falcon FileScan.io Free sandbox with MITRE ATT&CK mapping and behavioral analysis LOLBAS Living Off The Land Binaries — Windows binaries abused by attackers GTFOBins Unix binaries exploitable for privilege escalation and escape OSINT Framework Categorised directory of OSINT tools and data sources for investigations DNSDumpster Free domain research and DNS reconnaissance tool Malware Traffic Analysis PCAP samples and network traffic exercises for malware analysis practice

News & Advisories

Krebs on Security In-depth security journalism by Brian Krebs The Hacker News Breaking cybersecurity news and analysis Bleeping Computer Technical security news, ransomware coverage and malware analysis Cisco Talos Threat research, malware analysis and intelligence from Cisco's security team Unit 42 Threat intelligence and research from Palo Alto Networks Microsoft MSRC Microsoft Security Response Center — patch advisories and CVE details Google Project Zero Zero-day vulnerability research and responsible disclosure from Google BSI German Federal Office for Information Security — advisories and alerts NCSC (UK) UK National Cyber Security Centre — alerts and guidance SANS ISC Internet Storm Center — daily threat diaries and port activity

Incident Response & Forensics

Eric Zimmerman's Tools Free collection of Windows DFIR tools — Registry, event logs, artefact parsing Velociraptor Open source endpoint telemetry and DFIR platform — VQL-based hunting Volatility Memory forensics framework for analyzing RAM dumps from live systems Autopsy Free open source digital forensics platform with GUI — disk and file analysis MISP Open source threat intelligence sharing platform and IOC management TheHive Open source IR case management and collaboration platform SANS DFIR Posters Free quick-reference cheat sheets for Windows, Linux and memory forensics

Governance & Compliance

NIS2 Directive EU network and information security directive — requirements for essential and important entities BSI IT-Grundschutz German IT baseline security standards and catalogues EDPB Guidelines EU Data Protection Board guidelines on GDPR application and breach notification DORA EU Digital Operational Resilience Act — ICT risk requirements for the financial sector CSA Cloud Controls Matrix Security controls framework for cloud services — maps to ISO 27001, NIST, PCI DSS PCI DSS Payment Card Industry Data Security Standard — requirements for card data environments

Training & Practice

TryHackMe Guided, beginner-friendly security labs covering offensive and defensive topics Hack The Box Realistic practice labs for penetration testing, CTF and blue team skills OverTheWire Free wargames for learning Linux, networking and security fundamentals CTFtime CTF competition calendar, team rankings and writeup archive SANS Reading Room Extensive library of free security white papers and research Cybrary Free and paid cybersecurity training — SOC analyst, IR, penetration testing paths

OSINT & Infrastructure Research

urlscan.io Sandbox for websites — screenshots, requests, hosting and historical scans of any URL crt.sh Certificate transparency search — reveals subdomains and infrastructure a target never published Hurricane Electric BGP Toolkit ASN, prefix and peering research; free and without an account ViewDNS.info Reverse IP and reverse WHOIS, IP history, subdomain discovery — 25 lookup tools in one place Wayback Machine Historical snapshots of a site — useful when attacker infrastructure has already been taken down Bellingcat Guides Open-source investigation methodology from the practitioners who defined much of it

Leak & Breach Monitoring

Have I Been Pwned Check email addresses and domains against known breach corpora; free domain monitoring HPI Identity Leak Checker Hasso Plattner Institute — checks an address against leaked identity data, result by email only Intelligence X Search engine over leaks, pastes and archived sites by email, domain, IP or CIDR LeakIX Indexes exposed services and open databases — often the origin of a leak rather than its aftermath RansomLook Open tracker for ransomware leak sites — groups, posts and mirrors, with a public API

Defence-side resources only. This list deliberately contains no directories of marketplaces or criminal services: they are of little use to defenders and carry legal risk. Every entry was checked before being added — if one stops working, please report it.

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