Reverse engineer / malware analyst. On the hunt for domain generation algorithms. Current side project: rosti.bin.re/

Joined August 2013
21 Photos and videos
30 Jan 2025
Today, I'm releasing the first version of a small web 🚀: rosti.bin.re/ It provides IOCs and YARA rules collected semi-automatically from public blog posts and reports of almost 200 cybersecurity sites. I hope it proves useful to some of you ... 🙏✨ #ThreatIntel
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Johannes Bader retweeted
14 Nov 2024
According to @GovCERT_CH , an unknown threat actor has sent out postal letters (yes, *postal* letters ✉️) to recipients in Switzerland that pretend to originate from @meteoschweiz, luring the recipient into downloading and installing a rogue App 🔥🕵️‍♂️ The QR code in the letter leads to a malicious App that impersonating the "AlertSwiss" App of the federal administration. However, the App in fact is a version of Coper (aka Octo2) #malware, infecting mobile phones running Android 📱🤖 Payload delivery URL: 🌐 urlhaus.abuse.ch/url/3290212… Malware sample: 📄 bazaar.abuse.ch/sample/4928c… Coper botnet C2: 🔥 threatfox.abuse.ch/ioc/13448…ncsc.admin.ch/ncsc/en/home/a…

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Johannes Bader retweeted
What's happening? #FlareOn11 is happening! Time to update #BinaryRefinery and snag some flags! ✨ github.com/binref/refinery/flare-on11.ctfd.io/challenge…
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Johannes Bader retweeted
We're proud to be a @Quad9DNS partner, helping make the Internet a safer place!
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30 May 2024
Could you please share your IOCs in any format that is NOT low screenshots @Cloudflare 🙏? blog.cloudflare.com/disrupti…
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Johannes Bader retweeted
24 Apr 2024
Nice #MooBot botnet caught by @banthisguy9349 😂 Botnet C2 domain: 🔥 putin.zelenskyj .ru Pointing to: 45.88.90.30:43957 (AS203168 Constant MOULIN 🇧🇪) DNS resolution provided by Cloudflare 🔎 Payload URLs: 🌐 urlhaus.abuse.ch/host/45.88.… Payload: 📄 bazaar.abuse.ch/sample/21f1c…
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Johannes Bader retweeted
I wrote a blog post about MalpediaFLOSSed, a collection of ~4 million strings extracted from 1800 malware families and upgrading its GUI plugin to work with IDA, Ghidra, and Binary Ninja at once! Kudos to @hyun____22 for Hyara, which pioneered such cross-tool compatibility!
[blog post] MalpediaFLOSSed danielplohmann.github.io/blo…
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Johannes Bader retweeted
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Johannes Bader retweeted
I wrote a short blog post on MCRIT, the one-to-many code similarity analysis framework that we released as open source recently at @Botconf.
[blog post] MCRIT: The MinHash-based Code Relationship & Investigation Toolkit danielplohmann.github.io/blo…
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Johannes Bader retweeted
#BinaryRefinery 0.5.10 can deobfuscate this sample with little effort. Only had to add one new unit for StrReverse constant folding. Not a silver bullet, obviously, but why write those regular expressions yourself when you can make me do it for you?
CyberChef for Malware Analysis - DCRat Loader youtube.com/watch?v=rpp6BZYI…
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Johannes Bader retweeted
🛠️ .NET malware decompiling challenges: Obfuscations of strings/constants can be tedious. Automate w/ IDA Pro's Python 🐍 interface for MSIL binary patching, even for simple cases: threatcat.ch/blog/undo-dotne… #CyberSecurity #MalwareAnalysis #IDAPro #DotNET
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Johannes Bader retweeted
New video on the Domain Generation Algorithm of the file infector m0yv. We've sinkholed multiple domains & show how infections dramatically increased in the last 400 days 📈. #m0yv #DGA youtu.be/3RYbkORtFnk
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Johannes Bader retweeted
22 Dec 2022
Just updated the "malwarebazaar" Python module to include a Python and CLI client for @abuse_ch #YARAify and added a "richer" output. You can find it on Github (github.com/3c7/bazaar/releas…) and on PyPI (via "malwarebazaar"). #threatintel #malware
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Johannes Bader retweeted
12 Dec 2022
Fortinet released security updates for FortiOS to fix a heap-based buffer overflow vulnerability (CVE-2022-42475). Apply patches asap. Read more at: go.dhs.gov/Z8v

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Johannes Bader retweeted
16 Sep 2022
We published a tech paper on the #ConfuserEx obfuscation mechanism of a Ginzo .NET sample. This class of obfuscator is known as code flatteners. We describe how it can be dealt with using a Python script IDA Pro Blog: 👉govcert.ch/blog/unflattening… Paper: 👉govcert.ch/whitepapers/unfla…
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Johannes Bader retweeted
Replying to @chrissanders88
Since there's probably a few big CyberChef aficionados here, I'll go ahead and pitch my little rival project, the binary refinery: 🏭 github.com/binref/refinery/ It's (almost) like CyberChef, but it's a cross platform command line toolkit.
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1 Nov 2021
New blog post: Analysing TA551/Shathak malspam with binary refinery bin.re/blog/analysing-ta551-… I show how the open source framework "binary refinery" can be effective in analysing multistage TA551 malspams with encrypted ZIP, Word document, HTA and Javascript.
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9 Aug 2021
Domain Generation Algorithms are straightforward to program and usually bug free. Not so the new #DGA of #BazarLoader, which goes haywire during the summer months: bin.re/blog/a-bazarloader-dg…
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