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Danny van der Knaap — Offensive Security Engineer



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~$ whoami

I am a full-time Penetration Tester and Bug Bounty Hunter specializing in advanced web exploitation, custom offensive tooling, and deep-dive infrastructure assessments. I do not rely solely on off-the-shelf scanners; I architect asynchronous, context-aware frameworks to exploit complex logic flaws, race conditions, and deserialization vulnerabilities in modern, high-latency environments.

When a target resists the standard toolkit, I build the tool that breaks it.


~$ ls ./certifications

  • HTB Certified Web Exploitation Expert (CWEE): Passed — the advanced, fully hands-on benchmark for grey/white-box web exploitation.
  • HTB Certified Penetration Testing Specialist (CPTS): Full-scope network and AD penetration testing.
  • HTB Certified Web Exploitation Specialist (CWES): Bug-bounty and web app testing (formerly CBBH, renamed by HTB in October 2025).
  • PortSwigger Web Security Academy: 100% of labs solved, every module completed, both practice exams passed.
  • Continuous R&D: Developing pure-logic payloads and runtime-first architectures to bypass modern WAFs and EDRs.

~$ ls ./arsenal --private

A selection of my proprietary frameworks and utilities, built to automate complex attack chains, bypass filters, and maximize assessment velocity.

Tool Category Core Capability
Chronos Concurrency & Timing Asynchronous last-byte synchronization for race conditions and high-precision time-based fuzzing.
BitSQL Database Exploitation Universal async framework for advanced blind SQLi (BEUSTQ), dynamic WAF evasion, and out-of-band RCE.
Blinj Blind Injection Runtime-first payload architecture (Node.js, PHP, Python) for byte-accurate extraction without OS piping.
ProtoMap AST & Logic Flaws Automated discovery and exploitation of server/client-side prototype pollution and HTTP parameter pollution.
GQLMap API Security High-velocity GraphQL enumeration, security auditing, and intelligent introspection fuzzing.
Polyglot Serializer Deserialization Interactive multi-language (PHP, Python, Ruby, Java) gadget orchestration and OOB blind RCE shell.
Juggler Fuzzing Engine Context-aware type-juggling fuzzer with high-performance local magic-hash bruteforcing.
Cryptmap Cryptography Offline CLI for dynamic payload encoding, hashing, and AES-CBC encryption.

~$ cat ./burp_extensions.md

  • Burp Content Viewer: A native extension that automatically detects, prettifies, and visualizes complex HTTP responses (minified JSON/XML, raw CSV tables, PDF rendering, EXIF metadata extraction) directly inside the message editor.
  • OOB Collaborator Export: A professional extension featuring an embedded Tailwind CSS web dashboard and a JSON API to export out-of-band interactions into local automation pipelines — keeping the Burp Scanner logs pristine.

~$ cat ./tech_stack.txt

Python Java JavaScript Node.js Bash PHP


~$ ./stats --live

GitHub stats Top languages
Contribution activity graph
Snake eating the contribution graph

~$ inject --payload "<script>alert(1)</script>"

Reflected XSS proof-of-concept — click to expand
A reflected XSS alert popup (static SVG)

~$ ./connect

Hack The Box Profile     TryHackMe Profile

The best findings are the ones nobody else bothered to look for. The same goes for this page — the real recon starts in the source.

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