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

HackTheBox Sherlocks: Litter

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

HackTheBox Sherlocks: Meerkat

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

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. ...

Automating MS Sentinel content validation

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

Parsing KQL with Python

How to parse KQL by combining Python and C# ...