Dirk-jan @_dirkjan

Hacker at @OutsiderSec. Researches AD and Azure (AD) security. Likes to play around with Python and write tools that make work easier. dirkjanm.io Joined December 2017

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Dr. Nestori Syynimaa @DrAzureAD

9 hours ago

First time at @cybersaiyanIT #RomHack conference same time with @_dirkjan! Thanks @merlos1977 and other organisers for the great conference.

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Dirk-jan @_dirkjan

11 hours ago

Next up is @DrAzureAD on his world tour, visiting Rome for RomHack!

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Dirk-jan @_dirkjan

15 hours ago

Attending @cybersaiyanIT RomHack today, finally get to catch @leonjza's talk.

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📖 From Dispensing Pills to Dismantling Cyber Threats: One Woman's Epic Pivot In 2009, @IAMERICAbooted was ordering drugs with shared passwords—fast-forward to 2022, and she's pen-testing Azure tenants like a boss. This week on Entra.Chat, Erica recounts her DEFCON…

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Mehmet Ergene @Cyb3rMonk

a week ago

🚨Detect Actor Token Abuse (#CVE-2025-55241) After verifying the details with @_dirkjan, I created a query to detect Actor Token abuse, regardless of the activity involved. The idea is simple: If these activities are S2S, they should originate from Microsoft service IPs. 🧐…

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Dirk-jan @_dirkjan

a week ago

The CVSS score for the CVE has been adjusted to a 10.0 it appears 👀 msrc.microsoft.com/update-guide/v…

Dirk-jan @_dirkjan

a week ago

The CVSS score for the CVE has been adjusted to a 10.0 it appears 👀 msrc.microsoft.com/update-guide/v…

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Enno Rey @Enno_Insinuator

a week ago

@_dirkjan .@DrAzureAD even had an adapted slide in his presentation ;-) shout-out to @_dirkjan

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SinSinology @SinSinology

a week ago

NEED YOUR HELP! My Friend/Teacher Soroush (@irsdl) Is looking for a new company to join, you know him as the .NET-God, the guy who has popped exchange, sharepoint, has maintained ysoserial_.net for years, contributed to the exploitation scene numerous times, taught all of you…

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Cas van Cooten @chvancooten

2 weeks ago

🚀 Super excited to finally share that I have been working on a startup for over a year: @offensys! Offensys provides an enterprise platform for automated advanced attack simulations to enable continuous posture validation. 🌐Check out our new website: offensys.nl

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Dirk-jan @_dirkjan

2 weeks ago

MS Graph quiz time! A user has 15 WHFB keys registered. You delete all 15. How many keys does the user have left?

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_leon_jacobs(💥) @leonjza

2 weeks ago

I've been hacking on a new Windows Named Pipe tool called PipeTap which helps analyse named pipe communications. Born out of necessity while doing some vulnerability research on a target, its been super useful in reversing it's fairly complex protocol. :)