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Malcat dev

@malcat4ever.bsky.social
49 followers 16 following 47 posts

Main developer of malcat.fr, a hexadecimal editor / disassembler / decompiler for #malware analysis, #DFIR and #SOC.

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Malcat dev @malcat4ever.bsky.social · 22/09/2026
For full and pro users: we've released malcat 1.0.0-alpha3 for you to preview. It ships with: ● many GUI improvements (like side-by-side tabs) ● an even better MCP server with support for sandbox python transforms ● the first usable .NET and PYC decompilers!
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Malcat dev @malcat4ever.bsky.social · 06/08/2026
Very nice step-by-step analysis of a simple telegram loader (#Teleshim) by M.Boll. Good material if you're starting with #malcat: www.mboll.eu/posts/sharpe...
mboll.eu
Sharpen Your Pencil, We're Copying TeleShim's Telegram
Beginner-friendly Malcat walkthrough of a 32-bit sideloader that pretends to be a task-scheduler helper for ASUS, hides its config as base64 wrapped in a circular XOR, and uses api.telegram.org as its command channel. Covers the summary view, section entropy, exports, strings, anomalies, config decryption, and the getUpdates/sendMessage/sendDocument flow — all statically, without ever executing the sample.
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Malcat dev @malcat4ever.bsky.social · 19/07/2026
You like #capa but wish it would scan faster? Try out #Malcat 0.9.15, featuring a blazing fast native Capa scanner, among other improvements: malcat.fr/blog/0915-is...
malcat.fr
0.9.15 is out: capa scanning at native speed
Malcat 0.9.15 introduces a multithreaded C++ capa engine that reduces typical scan times from hours/minutes to seconds. It also brings integrated ATT&CK and MBC summaries, rule browsing and editing, s...
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Malcat dev @malcat4ever.bsky.social · 09/07/2026
In the upcoming 0.9.15 release, Malcat will embed its own 100% native #capa engine. So you get: - x10 .. up to x100 scan speedup - command line tool (using headless malcat lib) - embedded capa rule editor - additional architectures: arm, mips and even ... python:
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Malcat dev @malcat4ever.bsky.social · 18/05/2026
We had 9 LLMs battle on real-world #malware triage and static unpacking tasks, using only #Malcat MCP server. We compared not only their results, but also their speed and cost. Full write-up: malcat.fr/blog/benchma...
malcat.fr
Benchmarking LLMs for malware triage and static unpacking with Malcat
Ever wondered which LLM model is the best to analyse malware? Well, we did, and put them to the test. By strapping 9 state-of-the-art large language models to Malcat's powerful MCP server, we made the...
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Malcat dev @malcat4ever.bsky.social · 04/05/2026
#Malcat 0.9.14 is out! This is a maintenance build, with some bonuses: ● AccessDB parsing ● RAR unpacking ● UPX (static) unpacking ● Improved __noreturn detection ● ... and as usual, up-to-date signature, constants and Kesakode DBs. Happy reversing!
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Malcat dev @malcat4ever.bsky.social · 20/03/2026
In Malcat, hitting <Ctrl+M> will start the in-GUI MCP server (works in free version too). You can then interact with the current analysis using your LLM of choice. Here I renamed functions and variables of the C2 dispatcher function for an unknown malware:
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Malcat dev @malcat4ever.bsky.social · 10/03/2026
We're happy to announce that #malcat 0.9.13 is out! You'll find a new Apple-silicon MacOS port, two integrated MCP servers (in-GUI +headless) for automated triage and an improved interface: malcat.fr/blog/0913-is...
malcat.fr
0.9.13 is out: MacOS port, MCP server and dark mode
Malcat version 0.9.13 is out! In this release, we have added 3 features that were asked a lot: a MacOS port of Malcat, an integrated MCP server for LLMs to analyse malware with malcat and finally a pr...
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Malcat dev @malcat4ever.bsky.social · 24/02/2026
Quick peek at the upcoming 0.9.3 release. It will also feature a 100% headless MCP server for full and pro users.
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Malcat dev @malcat4ever.bsky.social · 05/02/2026
Sometimes, the absence of signature match is also interesting. Here the hashtag#Chrysalis sideloaded dll, where we can quickly spot the few interesting functions. Make sure to check "Show UNK" !
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Malcat dev @malcat4ever.bsky.social · 21/01/2026
A quick update on Malcat's MacOS development (apple silicon): A couple of visual glitches, but the analysis & UI are now functional \o/
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Malcat dev @malcat4ever.bsky.social · 16/01/2026
#malcat 0.9.12 is out! Enjoy .pyc and .net stack analysis, py 3.14 support, nuitka / inno 6.7 / .net singlefile bundle parsers and may other improvements: malcat.fr/blog/0912-is...
malcat.fr
0.9.12 is out: Python 3.14, PYC and .NET stack analysis
Malcat version 0.9.12 is out! This time we have focused on python and dotnet disassembly, with a new stack analysis that should improve their disassembly listing readability. We have also added suppor...
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Malcat dev @malcat4ever.bsky.social · 09/01/2026
#kesakode DB updated to 1.0.48: ● new sigs: Crazyhunter, Echogather, IranBot, MaskGramStealer, PulsarRat and Themeforestrat ● 9 existing entries updated ● FP-fixed signatures: 82 ● 1146 new clean programs whitelisted ● +527K unique functions ● +700K unique strings
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Malcat dev @malcat4ever.bsky.social · 05/12/2025
#Malcat tip: #Kesakode can be useful even when facing unknown/packed samples. Check "Show UNK" and focus on unique code and strings. Here a simple downloader:
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Malcat dev @malcat4ever.bsky.social · 16/11/2025
#Kesakode updated to 1.0.45 ! ● New malware entries: Fullmetal, Laplas, RoningLoader, ShadowRat, Silentsweeper and SystemShock ● Updated malware entries: 29 ● FP-fixed signatures: 931 ● 16587 new clean programs whitelisted ● 3452882 new functions ● 165257 new strings
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Malcat dev @malcat4ever.bsky.social · 02/11/2025
#kesakode DB update to 1.0.43, with again a focus on the clean set: ● 18 new malware entries ● 53 existing entries updated ● FP-fixed signatures: 749 ● 5280 new clean programs whitelisted ● +2M unique functions ● +300K unique strings
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Malcat dev @malcat4ever.bsky.social · 27/10/2025
Learn how to deobfuscate #Latrodectus using #malcat's scripting engine: malcat.fr/blog/malcat-...
malcat.fr
Malcat scripting tutorial: deobfuscating Latrodectus
In this tutorial, we will learn how to leverage Malcat's scripting and patching capabilities to deobfuscate an unpacked Latrodectus sample.
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Malcat dev @malcat4ever.bsky.social · 21/10/2025
#kesakode updated to 1.0.42: * New entries: Brickstorm, Butoflex, Ladvix, NetStar, Pantegana, Tendyron, Tsunamikit and VampireBot * Updated entries: AuraStealer, Latrodectus, NightshadeC2 and QNAPCrypt * 33275 new clean programs whitelisted * FP-fixed signatures: 1028
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Malcat dev @malcat4ever.bsky.social · 14/10/2025
#Kesakode updated to 1.0.41: Malware signatures: * New malware entries: 14 * Updated malware entries: 16 * FP-fixed signatures: 1340 Files: * 33 new malicious samples * 52010 new clean programs Database: * 13093705 new unique functions * 7778950 new unique strings
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Malcat dev @malcat4ever.bsky.social · 30/09/2025
#Malcat version 0.9.11 has been released, with support for ARM and Mach-O program analysis. More details below: malcat.fr/blog/0911-is...
malcat.fr
0.9.11 is out: ARM and MachO analysis
Malcat version 0.9.11 is out! With this release, Malcat is now able to analyse MacOS programs. That means: addition of Armv7, Armv8 and Aarch64 disassemblers and decompilers as well as MachO, DMG and...
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Malcat dev @malcat4ever.bsky.social · 25/09/2025
#Malcat tip #10: analysing backdoored clean software can be hard. A quick win is to pivot around known constants, thanks to Malcat's 400k+ constants DB (here a #Tropidoor dlder):
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Reposted by Malcat dev
Invoke RE @invokereversing.bsky.social · 22/09/2025
Tomorrow at BSides Edmonton! 🔥
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Malcat dev @malcat4ever.bsky.social · 22/09/2025
Updated #Kesakode to 1.0.39: * New malware entries: HybridPetya, MostereRAT, PhantomStealer, SatanLockV2 and Yurei * Updated malware entries: 38 * 3285 new library objects seen * 2622 new clean programs whitelisted * 905652 new unique functions * 1330028 new unique strings
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Malcat dev @malcat4ever.bsky.social · 18/09/2025
First steps with #malcat? Here is a tutorial video, courtesy of @invokereversing.bsky.social : www.youtube.com/watch?v=gqES...
youtube.com
Malcat : First Steps
YouTube video
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Malcat dev @malcat4ever.bsky.social · 12/09/2025
Updated #kesakode to 1.0.38: Malware signatures: * New malware entries: 20 new families * 564116 new unique functions * 197608 new unique strings * 27 new unique constant fingerprints
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Malcat dev @malcat4ever.bsky.social · 05/09/2025
Sometimes it looks like #malware, smells like #malware but it's just ... weird: malcat.fr/blog/get-you...
malcat.fr
Get your swimsuit, we're diving into a black SEO scheme
What started like an easy unpacking session to fill a Friday afternoon lead us to a singular black-SEO campaign. Together, we will unravel 4 different malicious loaders written in 4 different programm...
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Reposted by Malcat dev
Pasquale Stirparo 🇺🇦 🇪🇺 @pstirparo.bsky.social · 28/08/2025
TL;DR I am launching my #startup and we are going to change how to evaluate,cluster and reason about #malware, delivering accurate,contextual intelligence on samples. Say Hi to RationalEdge @rationaledge.bsky.social rationaledge.io #threatintel #threathunting #cti #reverseengineering #detection 1/9
rationaledge.io
RationalEdge - Intelligence Meets Accuracy
Advanced malware analysis and threat intelligence solutions by RationalEdge
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Reposted by Malcat dev
Invoke RE @invokereversing.bsky.social · 15/08/2025
We've uploaded our stream from July 28th where we triaged an Emotet infection chain with Renaud from @malcat4ever.bsky.social Enjoy! www.youtube.com/watch?v=xJof...
youtube.com
Triaging Malware with Malcat (Stream - 29/07/2025)
YouTube video by Invoke RE
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Malcat dev @malcat4ever.bsky.social · 24/07/2025
#Kesakode DB has been updated to 1.0.36 ! * 9 new malware families * 70 extended malware signatures * 37 new malicious samples in database * 11440 new library objects seen * 120k new clean programs whitelisted * 17M new unique functions * 3M new unique strings
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Malcat dev @malcat4ever.bsky.social · 10/07/2025
#Kesakode has been updated to 1.0.34! * 34 new malware entries * 249 extended malware signatures * 50 new malicious samples in database * 58950 new clean programs whitelisted * 5459056 new unique functions * 1862336 new unique strings
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Malcat dev @malcat4ever.bsky.social · 01/06/2025
Does someone know this #malware, since this is definitely NOT latrodectus. Looks like some Discord-backed infostealer: bazaar.abuse.ch/sample/85f8c...
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Malcat dev @malcat4ever.bsky.social · 27/05/2025
You can now check your strings in #malcat against an online library of #Malpedia FLOSSed strings. Just copy this plugin: github.com/malpedia/mal...
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Reposted by Malcat dev
Josh Stroschein | The Cyber Yeti @jstrosch.bsky.social · 09/05/2025
🚀 Malcat is a powerful binary file dissector that's essential for Windows and Linux IT-security professionals. As both a feature-rich hexadecimal editor and a disassembler, Malcat offers a comprehensive toolkit for in-depth binary analysis. Check it out 👇 www.youtube.com/live/yzC_539...
youtube.com
Learn How to Dissect Binary Files with the Creator of Malcat!
Malcat is a powerful binary file dissector that's essential for Windows and Linux IT-security professionals. As both a feature-rich hexadecimal editor and a ...
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Reposted by Malcat dev
Malcat dev @malcat4ever.bsky.social · 09/05/2025
#Malcat 0.9.10 is out! State-of-the-art CFG recovery, MIPS disassembler & decompiler and many UI improvements; malcat.fr/blog/0910-is...
malcat.fr
0.9.10 is out: CFG recovery, MIPS & UI improvements
Malcat version 0.9.10 is out! In this release, we have improved Malcat's CFG recovery algorithm and compared its performances against other reversing software. A new CPU architecture (MIPS) has also b...
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Malcat dev @malcat4ever.bsky.social · 09/05/2025
#Malcat 0.9.10 is out! State-of-the-art CFG recovery, MIPS disassembler & decompiler and many UI improvements; malcat.fr/blog/0910-is...
malcat.fr
0.9.10 is out: CFG recovery, MIPS & UI improvements
Malcat version 0.9.10 is out! In this release, we have improved Malcat's CFG recovery algorithm and compared its performances against other reversing software. A new CPU architecture (MIPS) has also b...
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Reposted by Malcat dev
evacide @evacide.bsky.social · 19/03/2025
Why might you want to read up on EFF's guide to border searches right now, you wonder? This is why.
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Reposted by Malcat dev
Malcat dev @malcat4ever.bsky.social · 17/02/2025
Malcat version 0.9.9 is out! Check out the new offline version of Kesakode for blazing-fast (unpacked) #malware identification across 2000+ families. Also python 3.13 support (& disassembler), new file parsers & improved UI: malcat.fr/blog/099-is-...
malcat.fr
0.9.9 is out: Offline Kesakode, python 3.13 & UI
Malcat version 0.9.9 is out! Say hello to the offline version of Kesakode, which lets you identify malware even faster and without uploading any hash! You will also see several UI improvements, python...
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Malcat dev @malcat4ever.bsky.social · 17/02/2025
Malcat version 0.9.9 is out! Check out the new offline version of Kesakode for blazing-fast (unpacked) #malware identification across 2000+ families. Also python 3.13 support (& disassembler), new file parsers & improved UI: malcat.fr/blog/099-is-...
malcat.fr
0.9.9 is out: Offline Kesakode, python 3.13 & UI
Malcat version 0.9.9 is out! Say hello to the offline version of Kesakode, which lets you identify malware even faster and without uploading any hash! You will also see several UI improvements, python...
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Malcat dev @malcat4ever.bsky.social · 17/01/2025
Malcat tip #9: So you have found this nice #malware hash in a report, but no sample? "File>Download from hash" will retrieve the hash for you from: ● Triage ● MalwareBazaar ● VirusShare ● MWDB ● FileScanIO NB: some of these sources require (free) API keys.
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Malcat dev @malcat4ever.bsky.social · 14/01/2025
In the next version of #malcat, we will include an _offline_ smaller #kesakode database which will only contain conflict-free malware signatures. This will be fast and run with every analysis. You can always get the full deal (clean + lib) afterwards with an online query.
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Malcat dev @malcat4ever.bsky.social · 27/12/2024
You'll soon be able to export #Malcat views to files: ● Summary report as HTML+ SVG ● Proximity & call graph views as SVG or PNG ● Struct/hex/disasm views as HTML ● Strings, symbols, intel, kesakode and other views as CSV
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Malcat dev @malcat4ever.bsky.social · 02/12/2024
Malcat 0.9.8 is out! You'll find a lot of QoL improvements, improved API and more doc. More infos: malcat.fr/blog/098-is-...
malcat.fr
0.9.8 is out: Scripting & QoL improvements
Malcat version 0.9.8 is out! You will find many quality-of-life improvements, such as an improved transform dialog, better scripting support, better data preview and many more.
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