You thought you could escape our attempts at reach out to you this Valentine’s Day? We won’t give up that easily ❤️
Happy Valentine’s Day!
🥈 @KalmarunionenDM ends 2025 as the 2nd best CTF team in the world!
That makes it three years in a row in the global top 3:
- 2023: #3
- 2024: #1
- 2025: #2
Staying up here is hard. The field keeps getting sharper, the big CTFs keep getting harder (LLMs are luckily still struggling with some types of challenges), and December is always brutal. We fought until the very end and are proud of how the season played out.
Huge respect to r3kapig for an insanely strong year and a well-earned #1 - that was some serious consistency across the toughest events.
For us, this season had a bit of everything: long nights, on-site + remote meetups, clutch moments, mistakes, recoveries, and a lot of learning. Older players still sweating, newer players stepping up, and the team as a whole getting better every event.
Thanks to everyone for making every weekend harder than planned - here’s to 2026!
#CTF #Hacking #Kalmarunionen
Thanks for an awesome #Hackceler8 - it was really fun this year!
It really came down to the wire at the end, hope to see you all again next year!
🏆 We did it: @KalmarunionenDM just won ASIS CTF - our 4th ASIS WIN!
It came down to the wire. Other amazing teams like @maplebaconctf, @shellphish and especially BunkyoWesterns and r3kapig pushed us right to the last minute. That pressure is exactly why we are playing the hardest CTFs in the world.
This is our fourth ASIS win, and it's a reminder that the top is never guaranteed. The field keeps getting sharper, and staying there takes full focus, deep teamwork, and a lot of grit.
It's been a minute since our last update. Even over summer break we stayed busy - we played the @defcon CTF Finals in Las Vegas, with teammates on-site and a Danish venue. Huge thanks to The Tech Collective for hosting us 🙏
What makes this season special: our seasoned members are still all-in, and our younger talent is levelling up every single event. That blend of experience and growth is exactly what we hoped for when we started Kalmarunionen - upskilling ourselves while building a pipeline for others.
🔜 What's next
- Google Hackceler8 Finals, Mexico - we're among the top 8 and can't wait to live-hack on stage.
- Copenhagen meetup - another big team session to keep the momentum rolling.
A special shoutout 🙌 to our sponsors whose support drives our meet-ups, learning initiatives, and participation in international competitions: Industriens Fond, JN Data, Dubex & ICSRange.
If you would like to support Kalmarunionen reach out to us at [email protected]!
🥈 2nd place at #GoogleCTF 2025!
Kalmarunionen fought hard all weekend and landed a strong second behind Friendly Maltese Citizens - who almost full-cleared the entire CTF. Huge props to FMC - that was seriously impressive - see you at the Hackceler8 Finals in Mexico City later this year 🇲🇽
It’s been a wild first half of the season, and Kalmarunionen currently sits at World #1 on the global CTF leaderboard. Let’s gooo!!
#Kalmarunionen #GoogleCTF #hacking #cybersecurity #dkpol #CaptureTheFlag
🎯 Triple CTF Weekend in Copenhagen! 🇩🇰💥
This weekend, @KalmarunionenDM gathered physically for another meetup at Eupry in Copenhagen for an intense and fun-filled hacking meetup - joined by several of our teammates chiming in remotely! 🧠⚡
While we were initially prepping for two bigger CTFs that unfortunately got postponed, we quickly adapted and dove headfirst into three other competitions instead:
🔹 Break the Syntax CTF
🔹 Dam CTF
🔹 San Diego CTF
The result?
🥇 We full cleared and won Break the Syntax CTF, Dam CTF, and San Diego CTF - a triple win that kept the flag bell ringing non-stop all weekend 🔔💥
A big thanks to #Eupry for hosting us - we had a blast solving challenges together, sharing knowledge, and pushing each other to think deeper and faster.
Weekends like this are part of what makes #Kalmarunionen special: a mix of collaboration, curiosity, and fighting spirit - and a chance for aspiring members to challenge themselves alongside some of the best CTF players in the world.
With the bigger CTFs postponed, we got an opportunity to slow down and dive deeper - sharing knowledge, solving problems together, and enjoying capturing flags. We play to win, but we also play because we love the challenge 💪🧠✨
✨ Special shoutout 🙌 to our sponsors whose support makes these meetups and our CTF journey possible:
Industriens Fond, JN Data, Dubex, ICSRange
If you’d like to support Kalmarunionen, reach out to Rolf Lunn or Morten Eskildsen on LinkedIn or write to us at [email protected].
#kalmarunionen #ctf #hacking #cybersecurity #community #breakthesyntax #dam #sdctf
KalmarCTF 2025 is a wrap! Congrats to the winning teams!
🥇 - organizers
🥈 - Blue Water
🥉 - Tower of Hanoi
4️⃣ - r3kapig
5️⃣ - about:blankets
6️⃣ - The Flat Network Society
A big thanks to our sponsors hex-rays and Zellic! See you all next year! 🚩
With under 48 hours till we kick off with #KalmarCTF 2025, we are happy to announce that @zellic_io is joining as a sponsor this year, as well as an updated prize pool!
Come compete with the best competitive hackers from around the world!
After securing the #1 spot on CTFtime last year, we've spent the winter cooking up a nice set of challenges to share what we've learned with the community! From approachable curiosities to the fiendishly difficult! There should be something for everyone!
Do you have what it takes to find 0-days and novel techniques? Will you solve all of our challenges? Join us from Friday!
Updated Prize Pool
🥇 First Place: $2000 and 3x IDA Pro Named Licenses (each with 2 Decompilers)
🥈 Second Place: $1000 and 2x IDA Pro Named Licenses (each with 2 Decompilers)
🥉 Third Place: $750 and 1x IDA Pro Named License (with 2 Decompilers)
4️⃣ Fourth Place: $500
5️⃣ Fifth Place: $400
6️⃣ Sixth Place: $350
Thanks again to @zellic_io as they join our long time sponsor @HexRaysSA in helping us put on a great CTF for the community!
Registrations are now open at https://kalmarc.tf !
𝗞𝗮𝗹𝗺𝗮𝗿𝗖𝗧𝗙 𝟮𝟬𝟮𝟱 𝗶𝘀 𝗷𝘂𝘀𝘁 𝗮𝗿𝗼𝘂𝗻𝗱 𝘁𝗵𝗲 𝗰𝗼𝗿𝗻𝗲𝗿 - 𝗰𝗼𝗺𝗲 𝗰𝗼𝗺𝗽𝗲𝘁𝗲 𝘄𝗶𝘁𝗵 𝘁𝗵𝗲 𝗯𝗲𝘀𝘁 𝗰𝗼𝗺𝗽𝗲𝘁𝗶𝘁𝗶𝘃𝗲 𝗵𝗮𝗰𝗸𝗲𝗿𝘀 𝗳𝗿𝗼𝗺 𝗮𝗿𝗼𝘂𝗻𝗱 𝘁𝗵𝗲 𝘄𝗼𝗿𝗹𝗱 𝗮𝗻𝗱 𝘄𝗶𝗻 𝗴𝗿𝗲𝗮𝘁 𝗽𝗿𝗶𝘇𝗲𝘀!
The #KalmarCTF 2025 is on the horizon, and Kalmarunionen is ready to raise the bar once again. Mark your calendars for March 7th - 9th, 2025, and gear up for a 48-hour showdown of skill, and pure CTF grit.
𝐇𝐞𝐫𝐞’s 𝐰𝐡𝐚𝐭’s 𝐢𝐧 𝐬𝐭𝐨𝐫𝐞:
With a generous nod to @HexRaysSA for making the coveted #IDAPro licenses possible, we promise an unforgettable event brimming with complex challenges in binary exploitation, reverse engineering, and other classic #CTF categories.
🥇 First Place: 3x IDA Pro Named Licenses* with 2 Decompilers each
🥈 Second Place: 2x IDA Pro Licenses* with 2 Decompilers each
🥉 Third Place: 1x IDA Pro License* with 2 Decompilers
Why join hashtag #KalmarCTF 2025?
- Test yourself against top global teams and except some fun and original challenges
- Immerse yourself in a thriving community of passionate CTF players and hackers.
If you’re ready to push your limits, claim your glory, and maybe take home some serious #HexRays loot, head over to KalmarC.TF for all the details.
REassemble your dream team, and lets see who takes all home the licenses this year.
