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Dutch_OsintGuy

@dutchosintguy.bsky.social
8.4K followers 834 following 184 posts

Dutch guy with Open Source Intelligence & Analysis skills • OSINT • Principal Instructor @SANSInstitute • SVP of Engineering& Chief Innovator @ shadowdragon.io

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Dutch_OsintGuy @dutchosintguy.bsky.social · 04/09/2026
Following the fatal Overasselt shooting and police operation, I’ve launched a dossier tracking verified developments, updated every 12 hours. Reports suggest an organised-crime link, but this is unconfirmed. dossier-overasselt.pplx.app #OSINT
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Dutch_OsintGuy @dutchosintguy.bsky.social · 31/08/2026
New blog: AI can read instructions you never saw. That makes prompt injection an OSINT problem. Learn how to spot it in webpages, PDFs and spreadsheets. Includes a CTF lab. www.dutchosintguy.com/post/when-th...
dutchosintguy.com
When the Source Attacks Back: Prompt Injection Is Coming for OSINT
AI can help investigators move faster. It can also be manipulated by the sources it reads. This practical guide shows how prompt injection enters OSINT workflows, how to detect hidden instructions in ...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 26/08/2026
ICYMI ⬇️
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Dutch_OsintGuy @dutchosintguy.bsky.social · 19/08/2026
AI gives OSINT speed. It does not give us confidence. My DEF CON 34 / Recon Village talk is online: "OSINT Is Still a Thinking Game: Surviving AI Without Losing Tradecraft" Video: www.youtube.com/watch?v=a3kS... Slides: github.com/Dutchosintgu...
youtube.com
OSINT Is Still a Thinking Game: Surviving AI Without Losing Tradecraft at DEFCON34
YouTube video by Dutch OsintGuy
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Dutch_OsintGuy @dutchosintguy.bsky.social · 10/08/2026
DEF CON 34 was unforgettable - not just for the Recon Village talk, but for the conversations, challenges, old friends, and new ones. Grateful to everyone who stopped to talk. I’m leaving inspired, humbled, exhausted—and with more ideas. Talk recording soon. #defcon34 #osint #ai
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Dutch_OsintGuy @dutchosintguy.bsky.social · 07/08/2026
Good morning Defcon34 @defcon.bsky.social
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Dutch_OsintGuy @dutchosintguy.bsky.social · 03/08/2026
OSINT Is Still a Thinking Game: Surviving AI Without Losing Tradecraft If you’re in Las Vegas for #BlackHat or DEFCON, I’d love to meet. Whether we’ve known each other for years or have never met before, feel free to reach out. See you in Vegas! #OSINT #DEFCON34
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Reposted by Dutch_OsintGuy
Dutch_OsintGuy @dutchosintguy.bsky.social · 14/07/2026
I'll be at BlackHat & DEFCON in Las Vegas this year. Always happy to catch up with old friends, meet new ones, and talk OSINT, cyber, AI, investigations—or anything security. If you're around, let's connect. See you in Vegas! 🍻 #BlackHat #DEFCON #OSINT
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Dutch_OsintGuy @dutchosintguy.bsky.social · 15/07/2026
Russian National, Denis Obrezko, accused of orchestrating cyberattacks. He is accused of participating in the Russian state-aligned threat group Void Blizzard, also known as Laundry Bear With ShadowDragon Horizon® I was able to find and analayse Obrezko his online footprint. #OSINT #CTI 1/2 🧵
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Dutch_OsintGuy @dutchosintguy.bsky.social · 14/07/2026
I'll be at BlackHat & DEFCON in Las Vegas this year. Always happy to catch up with old friends, meet new ones, and talk OSINT, cyber, AI, investigations—or anything security. If you're around, let's connect. See you in Vegas! 🍻 #BlackHat #DEFCON #OSINT
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Dutch_OsintGuy @dutchosintguy.bsky.social · 10/07/2026
𝗣𝗿𝗲𝗱𝗶𝗰𝘁𝗶𝗼𝗻 By 𝟮𝟬𝟯𝟬, every major Open Source Intelligence (OSINT), Cyber Threat Intelligence (CTI), law enforcement, and intelligence organization will have an Artificial Intelligence strategy. Almost none will have a 𝗝𝘂𝗱𝗴𝗺𝗲𝗻𝘁 𝗦𝘁𝗿𝗮𝘁𝗲𝗴𝘆. 🧵
dutchosintguy.com
Critical Thinking in OSINT due to AI
This isn’t a rant against AI. I use it daily, ChatGPT, Copilot, Claude, Gemini. They’re in my workflow like everyone else’s. But the tradecraft is slipping. Analysts are skipping the hard parts. They’...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 01/07/2026
I'm excited to announce I'll be speaking at @defcon.bsky.social #ReconVillage this August! My talk, "OSINT Is Still a Thinking Game," explores how AI dependence is eroding our tradecraft - and how to fight back. See you in Vegas. #DEFCON34 #ReconVillage #OSINT #CyberSecurity
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Dutch_OsintGuy @dutchosintguy.bsky.social · 19/06/2026
Taking the new biscuit pro for a (war)drive. Wifi / BLE sniffing is a highly overlooked technique within #osint research and investigations. Nerds gonna nerd 😎
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Dutch_OsintGuy @dutchosintguy.bsky.social · 15/06/2026
The @SANSInstitute #OSINT summit #Amsterdam is about to get started and sold out. Day 1 workshops, day 2 talks. I’ll be having a ton of fun chairing this together with Matt Edmondson. Looking forward to see old friends and make a bunch of new friends.
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Dutch_OsintGuy @dutchosintguy.bsky.social · 11/06/2026
A horrific #Belfast stabbing shows why responsible OSINT matters. Starting with one BBC article + basic Google searches, I used ShadowDragon Horizon to map public online signals around the suspect Not hacking. Not guessing. Just OSINT. www.bbc.co.uk/news/article... #OSINT #ShadowDragon
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Dutch_OsintGuy @dutchosintguy.bsky.social · 08/06/2026
I generated a realistic Amsterdam street with AI. It does not exist. Then I asked a new ChatGPT chat to geolocate it. It confidently named a real street. Then it found no strong AI tells. For OSINT, seeing is no longer believing. Verification is. Read: www.dutchosintguy.com/post/the-ams...
dutchosintguy.com
The Amsterdam Street That Never Existed
AI can generate a convincing Amsterdam street that never existed, then fail to recognize its own fiction when asked to geolocate it. This experiment shows why visual plausibility is no longer proof. F...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 11/05/2026
OSINT is changing fast: AI, disinfo infrastructure, closed platforms, leaked data, propaganda, and analytical error. I’ll be hosting the SANS OSINT Amsterdam Summit 2026 with Matt Edmonson. 📍Amsterdam 📅 15–16 June www.sans.org/cyber-securi...
sans.org
SANS OSINT Amsterdam Summit 2026
Unlock the full potential of your career with cybersecurity training at SANS OSINT Amsterdam Summit 2026. Guided by world-renowned instructors at the forefront of the field, this event provides exclus...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 09/05/2026
🚨 New blog: The open web is being poisoned by AI slop, synthetic personas, fake context and amplified lies. Once polluted information becomes searchable, repeated and summarised by AI, it can look like evidence. Evidence poisoning is the #OSINT is real ! www.dutchosintguy.com/post/evidenc...
dutchosintguy.com
Evidence Poisoning: The OSINT Crisis Nobody Is Ready For
Evidence poisoning is the contamination of the open web with synthetic, manipulated or amplified material that later appears useful as investigative evidence. In an age of AI slop, fake personas, recy...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 28/04/2026
AI made it easier to build #OSINT tools. It did not make them safer to trust. A tool does not need to crash to mislead you. It only needs to quietly shape what you collect, what you miss, and what you stop questioning. Read the blog here: www.dutchosintguy.com/post/vibe-co...
dutchosintguy.com
Vibe Coding Is Becoming an OSINT Risk
AI has made it easy for OSINT practitioners to build and install investigative tools. It has not made it safe to trust them. This blog examines the real risk behind vibe coding, viral GitHub apps, and...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 09/04/2026
ICYMI ⬇️
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Dutch_OsintGuy @dutchosintguy.bsky.social · 31/03/2026
I will be presenting the closing keynote at the SANS Amsterdam OSINT Summit, 15–16 June 2026: OSINT at a Crossroads: Thinking, Judgment, and the Human Edge This is going to be an awesome event. Full agenda with speakers will be announced soon. www.sans.org/cyber-securi...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 26/03/2026
REMINDER ! CFP for the SANS OSINT summit Amsterdam 15-16 june is still open for a few days. I know I have enough folks seeing this that can give awesome talks. Don't be shy and apply 😃 . If you are hesitant or want help with your CFP feel free to send me a message.
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Dutch_OsintGuy @dutchosintguy.bsky.social · 23/03/2026
My latest blog looks at how people can be spotted online, groomed, moved into closed spaces, and turned into disposable proxies for real-world violence. From Jewish targets to dissidents, this is about the runway before the fire starts. www.dutchosintguy.com/post/from-op...
dutchosintguy.com
From Open Web to Real-World Target: The OSINT Trail Behind Proxy Violence
This is not just random extremism. It is a pipeline. From open platforms to closed chats, vulnerable people can be spotted, shaped, tested, and pushed toward real-world violence as disposable proxies....
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Dutch_OsintGuy @dutchosintguy.bsky.social · 13/03/2026
Shoutout to #networkchuck - his recent video on AI almost making him quit YouTube pushed me to write this. New blog on #OSINT, cognitive overload, synthetic media, AI dependence, and the slow erosion of human judgment. Read my blog here: www.dutchosintguy.com/post/ai-may-...
dutchosintguy.com
AI and OSINT: The Cognitive Impact on Analysts and Intelligence Work
AI may not replace analysts first. It may break them first. This blog explores how cognitive overload, synthetic media, AI dependence, and algorithmic pressure may erode the human judgment behind OSIN...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 11/03/2026
Good news for the OSINT community. The SANS OSINT Europe Summit 2026 is coming to Amsterdam on 15-16 June 🇳🇱. And the Call for Papers is now open. 📅 Submit before 23 March 2026 app.smartsheet.com/b/form/019c7... Let’s push the craft forward. #OSINT
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Dutch_OsintGuy @dutchosintguy.bsky.social · 28/02/2026
Look forward to be hosting the SANS Institute #OSINT summit in #Amsterdam 🇳🇱with Matt Edmondson Steven Harris June 15-16 More info and call for talks will be announced soon! www.sans.org/cyber-securi...
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Reposted by Dutch_OsintGuy
Philippe Vynckier @pvynckier.bsky.social · 21/02/2026
‘Twitter randos’ are tracking US military flights. Why that creates a security risk san.com/cc/twitter-r...
san.com
‘Twitter randos’ are tracking US military flights. Why that creates a security risk
U.S. Air Force officials warn that public flight tracking by OSINT analysts poses a direct threat to military operational security worldwide.
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Dutch_OsintGuy @dutchosintguy.bsky.social · 17/02/2026
ICYMI 👇
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Dutch_OsintGuy @dutchosintguy.bsky.social · 11/02/2026
New Blog: AI isn’t just supporting OSINT — it’s distorting it. Hallucinations, poisoned data, synthetic narratives… and leadership often can’t see it happening. My new blog digs into this shift with examples, risks, and what must change. 📘 Read here: www.dutchosintguy.com/post/critica...
dutchosintguy.com
Critical Thinking Collapse 2.0: AI’s Impact on OSINT
AI isn’t just speeding up OSINT - it’s reshaping what investigators and leaders believe is true. As hallucinations, data poisoning, and AI-generated narratives flood the information space, critical th...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 03/02/2026
New Blog: More OSINT tools. More dashboards. Less actual reasoning. AI didn’t break OSINT, it revealed a problem that was already there. OSINT is still a thinking game. Read it here: www.dutchosintguy.com/post/osint-i...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 08/01/2026
ICYMI 👇
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Dutch_OsintGuy @dutchosintguy.bsky.social · 07/01/2026
New Blog: OSINT isn’t getting harder because investigators lack tools. It’s getting harder because the internet is becoming adversarial: disappearing data, closed platforms, AI deception. The next phase of #OSINT will be about judgment, not dashboards. www.dutchosintguy.com/post/the-nex...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 05/01/2026
ICYMI 👇
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Dutch_OsintGuy @dutchosintguy.bsky.social · 02/01/2026
🚨New blog: A city is not a word. It’s a language system. When people say “020,” “Mokum,” or “Freedom City,” they’re still talking about Amsterdam just not in a way your #OSINT investigation understands. Imagine how many you’re missing. Read the blog here: www.dutchosintguy.com/post/how-osi...
dutchosintguy.com
OSINT - Cities with hundreds of names | How OSINT investigators miss hidden clues
You think you know Amsterdam? You don’t. Even if you’re born and raised there. For OSINT investigators, analysts, and journalists, searching only for “Amsterdam” means missing half the signal. The cit...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 22/12/2025
🧵 1/14 2025 wasn’t a writing exercise for me. It was a warning. Across every blog I wrote this year, one pattern kept repeating: OSINT doesn’t fail because we lack data, tools, or AI. It fails when we stop thinking.
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Dutch_OsintGuy @dutchosintguy.bsky.social · 21/12/2025
Happy #OSINT holidays to all my followers and friends !
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Dutch_OsintGuy @dutchosintguy.bsky.social · 08/12/2025
One more companion blog for the one below. Because it is such an important topic : www.dutchosintguy.com/post/the-kid...
dutchosintguy.com
THE KIDS AREN’T ALRIGHT - AND THE INTERNET KNOWS IT
A 13-year-old boy sat gaming after school while someone he’d never met groomed him in a private chat. His mother sensed the shift only when his humour sharpened, his tone hardened, and his words echoe...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 01/12/2025
New Blog: This will be my last blog of 2025. And since we are close to the Xmas holidays kids will probably spend hours scrolling on their phones. Read the blog here : THE ALGORITHMIC ANXIETY MACHINE | You can expose the social media algorithm dangers with OSINT www.dutchosintguy.com/post/the-alg...
dutchosintguy.com
THE ALGORITHMIC ANXIETY MACHINE | You can expose the social media algorithm dangers with OSINT
If you want to know why teens feel broken, watch a fresh account for thirty minutes. It starts with jokes and ends in panic attacks, body shame, and self-diagnosis. Kids aren’t searching for this. The...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 24/11/2025
#HUMINT is human truth. #OSINT is digital truth. Neither makes sense without the other. I wrote about this in my latest blog. What I’ve seen work, what I’ve seen fail, and why intelligence today is never one discipline alone. www.dutchosintguy.com/post/when-hu...
dutchosintguy.com
When HUMINT Forgot the Internet: Why Human Intelligence Needs OSINT More Than Ever
Human intelligence is powerful, but incomplete without digital validation. Based on real-world investigations, this blog explores why HUMINT operators, law enforcement, and intelligence agencies must ...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 20/11/2025
This is why I love working for @ShadowDragonIO. We build #OSINT capabilities that help uncover real world criminals. This use case started with one FBI Most wanted page: www.fbi.gov/wanted/cyber... Park Jin HYOK is wanted by the FBI for his role as a hacker for #DPRK. 1/3
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Dutch_OsintGuy @dutchosintguy.bsky.social · 17/11/2025
New blog: Discover the art of report writing in #OSINT. Learn how effective report writing transforms data into actionable insights. Read the blog here: www.dutchosintguy.com/post/osint-a...
dutchosintguy.com
OSINT Analysis Intelligence Reporting: Mastering Report Writing Skills
Intelligence reports turn raw OSINT data into actionable insight. After two decades in the field, one lesson stands out: collection means nothing without clear communication. The real value lies in an...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 04/11/2025
New Blog: Fatigue is the invisible corruption of intelligence work. It dulls intuition, erodes skepticism, and makes analysts trust tools more than their own reasoning. #OSINT doesn’t fail when data runs out. It fails when curiosity does. Read: www.dutchosintguy.com/post/black-s...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 20/10/2025
Tip: Space #OSINT ✨🛰️📡 KeepTrack Space is a free, open-source web tool for visualizing and analysing objects in Earth orbit (satellites, debris, launches & more) app.keeptrack.space
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Dutch_OsintGuy @dutchosintguy.bsky.social · 29/09/2025
New blog: Beyond Dashboards: OSINT’s Next Two Decades Explore the future of OSINT with AI as I (try to) delve into the next two decades of advancements. Discover how OSINT and AI will redefine tradecraft. www.dutchosintguy.com/post/beyond-... #OSINT #AI #Tradecraft #future
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Dutch_OsintGuy @dutchosintguy.bsky.social · 11/09/2025
Some people online are claiming that #Kirk was shot up close by a man standing next/close to him. This is not true. After the impact you can clearly see his right hand is empty, NO GUN. #OSINT #CharlieKirk
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Dutch_OsintGuy @dutchosintguy.bsky.social · 10/09/2025
Morning coffee, skimming the news. This article about the arrest of a serial killer caught my attention : nypost.com/2025/09/08/u... Decided to use our #OSINT enterprise solution @shadowdragonio.bsky.social to see if I could learn about the suspect. Couple of minutes I was able to uncover A LOT !
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Dutch_OsintGuy @dutchosintguy.bsky.social · 05/09/2025
New Blog: Discover how graffiti serves as modern hieroglyphics in #OSINT. Explore graffiti's role in gang communication and territorial markers today. www.dutchosintguy.com/post/osint-r...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 30/08/2025
ICYMI ⬇️
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Dutch_OsintGuy @dutchosintguy.bsky.social · 22/08/2025
New Blog: Most people doing #OSINT aren’t doing OSINT. They’re just Googling with extra steps, screenshotting dashboards, and calling it “intelligence.” That’s not tradecraft. That’s cosplay. Let’s talk about what OSINT is not: www.dutchosintguy.com/post/stop-ca...
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Dutch_OsintGuy @dutchosintguy.bsky.social · 18/08/2025
Cooking up a new sun and moon shadow-cast calculator for #OSINT investigations. Looking for input for (advanced) features.... anyone? See screenshots of work in progress:
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