Joona (@joohoi) 's Twitter Profile
Joona

@joohoi

Hacks for beer. FOSS, infosec and privacy. Chaotic good. Head of Security Testing at @visma

ID: 50406524

linkhttps://io.fi calendar_today24-06-2009 19:27:24

2,2K Tweet

5,5K Followers

730 Following

withad (@w1th4d) 's Twitter Profile Photo

We finally published JarPlant (Java Archive Implantat Toolkit) on GitHub! It's still a work in progress, but it works (mostly). It's a red team tool for injecting malicious code into Java apps and libraries. Use responsibility. github.com/w1th4d/JarPlant

STÖK ✌️ (@stokfredrik) 's Twitter Profile Photo

Bitflips blows my mind! About a month ago Joona and I released our super sweet tool certainly at blackhat and yesterday we presented our research around bitflips and their unexpected impact on modern apps at SEC-T . Proud of us and our work 🥰 youtu.be/R_roEB2sz9M?si…

Joona (@joohoi) 's Twitter Profile Photo

A presentation of an amazing adventure into the land of Bitflips, network protocols and cosmic rays by STÖK ✌️ @ WHY2025 and yours truly has been accepted to Ekoparty | Hacking everything ! Excited to meet the LATAM community, and also a perfect excuse to visit some awesome colleagues in Argentina!

STÖK ✌️ (@stokfredrik) 's Twitter Profile Photo

Excited about the opportunity of getting back to one of my absolute favorite places: Buenos Aires and the mainstage of this years Ekoparty | Hacking everything! Grateful and hyped to have Joona with me on the adventure! Can’t wait to meet up with yall and hang out with Bug Bounty Argentina

Excited about the opportunity of getting back to one of my absolute favorite places: Buenos Aires and the mainstage of this years <a href="/ekoparty/">Ekoparty | Hacking everything</a>! Grateful and hyped to have <a href="/joohoi/">Joona</a> with me on the adventure! 

Can’t wait to meet up with yall and hang out with <a href="/BugBountyArg/">Bug Bounty Argentina</a>
Orange Tsai  🍊 (@orange_8361) 's Twitter Profile Photo

Remember CVE-2024-4577, the PHP-CGI RCE bypass? Actually, the Best-Fit 'feature' also impacts non-CJK codepages such as locales in the Americas, Western Europe, Oceania, and more! splitline 👁️🐈‍⬛ and I will share these cool findings at Black Hat! 🔥 Let's make argument

Remember CVE-2024-4577, the PHP-CGI RCE bypass? Actually, the Best-Fit 'feature' also impacts non-CJK codepages such as locales in the Americas, Western Europe, Oceania, and more! <a href="/_splitline_/">splitline 👁️🐈‍⬛</a> and I will share these cool findings at <a href="/BlackHatEvents/">Black Hat</a>! 🔥

Let's make argument
Ekoparty | Hacking everything (@ekoparty) 's Twitter Profile Photo

Ahora si, ¡conocé las charlas del MainTrack #EKO2024! 🥳🔥 🎟️ ¿Todavía no tenés tu entrada? ¡Reservá tu lugar! >> entradas.ekoparty.org

Ahora si, ¡conocé las charlas del MainTrack #EKO2024! 🥳🔥

🎟️ ¿Todavía no tenés tu entrada? ¡Reservá tu lugar! &gt;&gt; entradas.ekoparty.org
Ekoparty | Hacking everything (@ekoparty) 's Twitter Profile Photo

Charlas MainTrack #EKO2024 🔥 📌 STÖK ✌️ @ WHY2025, Hacker - Creative 📌 Joona, Head of Security Testing 💡 “Flipping Bits: Your Credentials Are Certainly Mine”: Did you know that if you change a single bit from 1 to 0 (or vice versa) in the first 'g' of the domain name

Charlas MainTrack #EKO2024 🔥

📌 <a href="/stokfredrik/">STÖK ✌️ @ WHY2025</a>, Hacker - Creative
📌 <a href="/joohoi/">Joona</a>, Head of Security Testing

💡 “Flipping Bits: Your Credentials Are Certainly Mine”: Did you know that if you change a single bit from 1 to 0 (or vice versa) in the first 'g' of the domain name
Joona (@joohoi) 's Twitter Profile Photo

Hey @ekozonaredteam / Bug Bounty Argentina , are you planning to have lightning talks in your Ekoparty village schedule? As I’ll be around the conference, I could do a lightning talk about newer / less known ffuf features (in case that sounds interesting to you).

Hey @ekozonaredteam / <a href="/BugBountyArg/">Bug Bounty Argentina</a> , are you planning to have lightning talks in your Ekoparty village schedule?

As I’ll be around the conference, I could do a lightning talk about newer / less known ffuf features (in case that sounds interesting to you).
Bug Bounty Argentina (@bugbountyarg) 's Twitter Profile Photo

Excited to announce Joona’s Turbo Talk, "ffuf - Fantastic Features Used by Few" at the #BugBountyVillage during Ekoparty | Hacking everything! 🎉 Dive into underutilized features in the web fuzzing tool ffuf, with examples to boost your skills and efficiency in offensive security. 🔥 📅

Excited to announce <a href="/joohoi/">Joona</a>’s Turbo Talk, "ffuf - Fantastic Features Used by Few" at the #BugBountyVillage during <a href="/ekoparty/">Ekoparty | Hacking everything</a>! 🎉 Dive into underutilized features in the web fuzzing tool ffuf, with examples to boost your skills and efficiency in offensive security. 🔥

📅
Joona (@joohoi) 's Twitter Profile Photo

I’ll be around Ekoparty for the next three days. Going to deliver a ffuf talk later today and a bitflip talk together with STÖK ✌️ @ WHY2025 on friday. I have a good bunch of ffuf stickers with me, so if you see me around, come and say hi and get yours! Pic: me today

I’ll be around Ekoparty for the next three days. Going to deliver a ffuf talk later today and a bitflip talk together with <a href="/stokfredrik/">STÖK ✌️ @ WHY2025</a> on friday. 

I have a good bunch of ffuf stickers with me, so if you see me around, come and say hi and get yours!

Pic: me today
Ekoparty | Hacking everything (@ekoparty) 's Twitter Profile Photo

🔴 Ya están en el LADO B STÖK ✌️ @ WHY2025 y Joona 😎 Cerrarán hoy el maintrack con su charla: "Flipping Bits: Your Credentials Are Certainly Mine". Sumate al stream junto a Federico Kirschbaum y Gala Cacchione 👽 >> twitch.tv/ekoparty

Herrasmieshakkerit (@hakkerit) 's Twitter Profile Photo

Ylämuistialan kartanon turvakamerassa Tietoturvatyökaluvelho Joona. Jakso julkaistaan huomenna! #herrasmieshakkerit #äänijulkaisu #podcast