Hi there!

My name is Joey Dreijer. I’m a freelance security consultant specialising in the area of detection engineering, security engineering and purple teaming. I enjoy finding new ways to use data for security. You can find my search engine with aggregated detections and threat hunting content using the navbar above or via https://decon.optyx.io.
Currently busy with: Red Team Operations

Automating MS Sentinel content validation

How to implement an automated MS Sentinel content checker in a CICD pipeline ...

4 min · Joey Dreijer

Finding targeted phishing campaigns with visual brand detection

How to implement brand identification logic using (mostly) Azure services to detect potential phishing campaigns targeting your organisation. ...

7 min · Joey Dreijer

HackTheBox Sherlocks: Bumblebee

This is a writeup for the HackThebox Bumblebee challenge. ...

3 min · Joey Dreijer

HackTheBox Sherlocks: Litter

This is a writeup for the HackThebox Litter challenge. ...

3 min · Joey Dreijer

HackTheBox Sherlocks: Meerkat

This is a writeup for the HackThebox Meerkat challenge ...

4 min · Joey Dreijer