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@cryptax

Android malware analysis. Ph0wn CTF founder. IoT hacking. Frequent speaker at Virus Bulletin, Insomnihack etc. Based in France. Currently testing Bluesky. Otherwise on Mastodon.social.

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07.01.2024
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Latest posts by @cryptax

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Ph0wn CTF

What's particularly cool about Ph0wn CTF?

1. It's onsite. If you haven't ever been to an onsite CTF, you absolutely must.
2. It's dedicated to connected devices, so you get to interact with tons of equipment!
3. The challenges are really awesome, yes, yes.

Register at ph0wn.org - March 13/14

05.03.2026 11:22 ๐Ÿ‘ 1 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Oh? Rust based keylogger?!

04.03.2026 07:14 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Ce mardi 3 mars 2026, une รฉclipse totale de Lune se produit. Une partie de la planรจte aura lโ€™occasion de voir le satellite prendre une teinte rougeรขtre, ce qui amรจne parfois ร  lโ€™appeler ยซ Lune de sang ยป.
#PosterCarto de la #Lune ! :) ๐Ÿ‘‡
le-cartographe.net/publications...

03.03.2026 13:06 ๐Ÿ‘ 14 ๐Ÿ” 4 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 1

So you're advocating for no antivirus? Is that it? Hmmm.

04.03.2026 07:11 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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We hid backdoors in ~40MB binaries and asked AI + Ghidra to find them - Quesma Blog BinaryAudit benchmarks AI agents using Ghidra to find backdoors in compiled binaries of real open-source servers, proxies, and network infrastructure.

Can AI Agents detect some hidden Backdoors in Binaries? Experiments with Code injected in C/Rust Projects, then analyze of resulting Binary with AI Coding Agents + access to reverse engineering Tools (Ghidra, Radare2, and binutils) #ReverseEngineering #AI quesma.com/blog/introdu...

03.03.2026 20:10 ๐Ÿ‘ 2 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 1
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En images : la nรฉbuleuse de lโ€™ล’il du Chat vue par Hubble et Euclid | CNES Une nouvelle image a รฉtรฉ dรฉvoilรฉe aujourdโ€™hui par lโ€™ESA : une observation conjointe des satellites Hubble et Euclid, qui se sont intรฉressรฉs de trรจs prรจs ร  la nรฉbuleuse de lโ€™ล’il du Chat, ou NGC 6543.

๐Ÿ‘๏ธ๐ŸŒŒ La nรฉbuleuse de lโ€™ล’il du Chat comme vous ne lโ€™avez jamais vue !

Grรขce ร  Hubble Space Telescope et Euclid, une nouvelle image spectaculaire rรฉvรจle les derniers instants dโ€™une รฉtoile ร  4 300 annรฉes-lumiรจre.

๐Ÿ‘‰ ร€ lire ici : cnes.fr/actualites/i... #Cnes @esa.int @ec-euclid.bsky.social

03.03.2026 20:37 ๐Ÿ‘ 61 ๐Ÿ” 23 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0

Reminds me of ph0wn teaser !!

#ctf

04.03.2026 06:59 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Phrack gnome ansified by nail!

Phrack gnome ansified by nail!

I spy a Phrack gnome in the latest FIRE #ansi pack! Thanks @nail7.bsky.social, it's so cool!

04.03.2026 05:35 ๐Ÿ‘ 27 ๐Ÿ” 7 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Ph0wn CTF

โฐTime to register to ph0wn CTF now!
There are also a few remaining seats to the Embedded Rust workshop, where you'll implement the ๐ŸSnake game on Micro:Bit.
Don't forget your pirate costume ๐Ÿง™โ€โ™€๏ธfor the Creative Contest, and your xploits for ph0wn2own!

ph0wn.org

02.03.2026 07:53 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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This piece of code (Arduino) is vulnerable.
What's the best fix? Comment.

Don't know, or want to discuss about it? Come to ph0wn in Sophia Antipolis on March 13-14: ph0wn.org (free, registration required).

24.02.2026 08:01 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Replay de Mardi dernier โฌ‡๏ธ
En vous souhaitant une belle journรฉe ๐ŸŒป

www.youtube.com/live/asGIbQg...

19.02.2026 11:28 ๐Ÿ‘ 2 ๐Ÿ” 2 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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For ph0wn registration, we see that many of you are struggling to put several items in your cart and consequently create x different registrations.

It's simple. In pretix, you need to click on "Add tickets for a different date". Then select an other "event" : CTF, social event, workshop.

#ph0wn

17.02.2026 15:29 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Hoy โš”๏ธ
Next Stream : FrangiPh0wn CTF - What, How, Who, WriteUps! ๐Ÿ’ฃ
๐Ÿ‘‰ Mardi 17 Fevrier ร  21h Ft. @Cryptax , Miaou, YoyoChaud
๐Ÿ‘‰ Join Live www.twitch.tv/thelaluka
๐Ÿ‘‰ Discord Events discord.com/events/11337...

13.02.2026 08:59 ๐Ÿ‘ 1 ๐Ÿ” 2 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 1
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Are you stuck on one of the first 2 challenges of #FrangiPh0wn? As the teaser ends in 2 days, we've released a few hints, and hope they will help you reach the next level ;)

ctf.ph0wn.org

#RF #OSINT #AI #retrogaming #ph0wn #CTF

07.02.2026 13:30 ๐Ÿ‘ 2 ๐Ÿ” 2 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Image of pirates, with pirate ships in background. This advertises for Ph0wn's creative contests, where if you "exploit the outfit", you get a chance to win a Hydrabus. https://ph0wn.org

Image of pirates, with pirate ships in background. This advertises for Ph0wn's creative contests, where if you "exploit the outfit", you get a chance to win a Hydrabus. https://ph0wn.org

๐Ÿ“… March 13-14, 2026 - Sophia Antipolis, France

๐Ÿค  Prepare your best outfit for Ph0wn CTF's side event: the "Creative Contest". Come dressed up as a pirate, and get a chance to win a Hydrabus ๐Ÿ˜ƒ

๐Ÿ‘‰๏ธ Details: ph0wn.org/contest/

#CTF #ph0wn2026 #pirate #flagship #hydrabus #hacker
Re-posts appreciated

26.01.2026 13:58 ๐Ÿ‘ 3 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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All hands on keyboard, pen to paper - Elbsides 2026 Call for Paper is open!!!

Make good on your New Year resolution to contribute to the infosec community and present on June 5th in Hamburg.

www.elbsides.eu/2026/cfp/

#elbsides2026 #CFPisopen #startwriting #infosec

14.01.2026 13:34 ๐Ÿ‘ 3 ๐Ÿ” 3 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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FrangiPh0wn, the Ultimate Galette for Hackers and ph0wn CTF teaser, is up until Feb 9. Head to ctf.ph0wn.org, and find the trinkets!

Are you up to it? Only 15 participants flagged something up to now. Go for it!

#CTF #teaser #RF #OSINT #ph0wn #frangiph0wn

10.01.2026 12:38 ๐Ÿ‘ 3 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Ph0wn #CTF Teaser Announced for January!

We hope you get the right tools and skills for Xmas :D
Get ready! We will announce #FrangiPh0wn in January.
Keep an eye on ph0wn.org

16.12.2025 15:55 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Cryptax Nomination Awards 2025 H2 Cryptax Nomination Awards. Lol. In other words, Iโ€™m listing my favorite talks, papers, challenges (etc) for the second half of 2025. Nothing more than that. Okay? H2 2025 Category Nominated Best secur...

Best talks, papers, CTF challenges, tools I encountered in the second half of 2025:

cryptax.github.io/nomination-2...

Congratulations to those who are listed, and kudos to others :)

cc: @trufae.bsky.social @uybhys.bsky.social @nst021.bsky.social @synacktiv.com

16.12.2025 11:04 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 1

Excellent game, I loved it! Work, work!

12.12.2025 13:06 ๐Ÿ‘ 0 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
New eBPF Filters for Symbiote and BPFdoor Malware | FortiGuard Lab FortiGuard Labs discovered new Symbiote and BPFDoor variants exploiting eBPF filters to enhance stealth through IPv6 support, UDP traffic, and dynamic port hopping for covert C2 communication.โ€ฆ

Variants of 2025 of Symbiote and BPFDoor support IPv6, UDP communication with C2.

Reverse engineering the samples with r2ai and r2mcp.

www.fortinet.com/blog/threat-...

#malware #Linux #BPF #r2ai #r2mcp

08.12.2025 08:40 ๐Ÿ‘ 0 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Pour mon atelier "Reverse engineering with r2ai" ร  @uybhys.bsky.social demain, si vous avez un laptop x86, tรฉlรฉchargez en avance l'image:

docker pull cryptax/r2ai:2025.11

#radare2 #IA #r2ai #UYBHYS25 #docker #workshop

06.11.2025 21:51 ๐Ÿ‘ 1 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Merci de prรฉ-installer sur vos laptops: Docker, Python 3 et Java.

Cet atelier est accessible ร  ceux qui ne connaissent ni Radare2 ni Ghidra.
Mais il est conseillรฉ d'avoir des bases en assembleur ou d'avoir dรฉjร  dรฉcompilรฉ des binaires (qq soit le logiciel utilisรฉ).
C'est un peu technique qd meme...

04.11.2025 10:46 ๐Ÿ‘ 1 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Ca va parler de Radare2, de Ghidra, de MCP et d'assembleur en tout genre. L'objectif est d'utiliser l'IA pour faciliter la rรฉtro-ingรฉnierie. L'IA ne fait pas tout (par exemple, elle ne fait pas les crรชpes que je compte dรฉguster sur place), mais elle aide ... si on sait l'utiliser.

Venez !

04.11.2025 10:44 ๐Ÿ‘ 3 ๐Ÿ” 2 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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#UYBHYS

A l'occasion de #UYBHYS25, de 10h ร  17h les vendredi 7 et samedi 8 novembre, @ratzillas.bsky.social animera, sur le parvis du #Quartz ร  #Brest, un atelier de dรฉmonstration de "Car Hacking", accessible ร  toutes et tous sans inscription. ๐Ÿ™‚

03.11.2025 11:43 ๐Ÿ‘ 8 ๐Ÿ” 6 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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Unlock Your Brain, Harden Your System #UYBHYS ! 7 Novembre 2025 โ€“ 8 Novembre 2025

#UYBHYS #UYBHYS25 #Brest

Il reste encore des places pour quelques ateliers de vendredi et pour la journรฉe de confรฉrences de samedi.

Billetterie : pretix.eu/cantine/UYBH...

03.11.2025 12:42 ๐Ÿ‘ 2 ๐Ÿ” 4 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0

Setting up your laptop before the workshop:

- It helps if you have already installed Radare2: radare.org/n/radare2.html .

- If you want to isolate your own OS from the workshop, I recommend Exegol, or Docker, or a Kali VM.

#radare2 #exegol #docker #kali #brucon

22.09.2025 14:42 ๐Ÿ‘ 2 ๐Ÿ” 0 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
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On Thursday afternoon, I am thrilled to give my first r2ai & ghidraMCP workshop at BruCON.

Pre-requisites: you are good to go if you already have reversed a binary (with whatever #disassembler, it doesn't matter) OR if you have basic skills and understanding in #assembly.

#mcp #LLM #AI

22.09.2025 14:41 ๐Ÿ‘ 3 ๐Ÿ” 0 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0
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Linux/Trigona analysis of /fast option Recorded by cryptax

One of the demos is here: asciinema.org/a/pBPEaJhp6c...

It demonstrates the automatic mode of r2ai, where we can ask a question whose answer requires to read/understand several functions of the binary.

#radare2 #r2ai #AI #LLM

01.09.2025 08:15 ๐Ÿ‘ 3 ๐Ÿ” 1 ๐Ÿ’ฌ 0 ๐Ÿ“Œ 0
Publications | FortiGuard Labs <p>This talk presents 2 different Linux malware:</p><ul><li><p>a shellcode, named Linux/Shellcode_ConnectBack.H!tr. The binary is small and compact, but traditional disassemblers like Ghidra fail to p...

Slides of my prez at Barb'hack: www.fortiguard.com/events/6189/...

Understand what a recent sample of Linux/Trigona #ransomware does.

Learn how to spot #AI errors (hallucinations, omissions etc), learn how to tweak context length, output token limits to get the best out of your model.

#barbhack25

01.09.2025 08:13 ๐Ÿ‘ 6 ๐Ÿ” 2 ๐Ÿ’ฌ 1 ๐Ÿ“Œ 0