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Possible ACR Stealer From Page Impersonating Claude, (Tue, May 26th)
Introduction In recent weeks, I’ve searched for pages impersonating Claude that distribute malware. In recent weeks, I’ve reliably found these sites through malicious ads in Google searches that lead to these pages, often concealed in URLs for sites.google[.]com, such as this example from 2026-05-11. These fake Claude pages generally show instructions for macOS malware when…
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Microsoft Access VBA, (Mon, May 25th)
Microsoft Access files (Microsoft Office’s Database) can contain VBA code. But they are not ole or OOXML files. You can’t analyze them with oledump.py: Neither do they contain an embedded OLE file: Microsoft does not publish official documentation for the Microsoft Access file format, like it does for CFB (ole) and OOXML. That inspired me…
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TeamPCP Supply Chain Campaign: Activity Through 2026-05-24, (Mon, May 25th)
TeamPCP now operates across three package ecosystems in parallel, it reached GitHub’s own internal codebase, it trojanized an officially Microsoft-published Python SDK, and it appears to have open-sourced its own framework on GitHub. Bottom line up front Three escalations stacked inside a single week. First, GitHub’s CISO Alexis Wales publicly named a malicious Nx Console…
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TeamPCP Supply Chain Campaign: Activity Through 2026-05-24, (Mon, May 25th)
TeamPCP now operates across three package ecosystems in parallel, it reached GitHub’s own internal codebase, it trojanized an officially Microsoft-published Python SDK, and it appears to have open-sourced its own framework on GitHub. Bottom line up front Three escalations stacked inside a single week. First, GitHub’s CISO Alexis Wales publicly named a malicious Nx Console…
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Wireshark 4.6.6 Released, (Sun, May 24th)
Wireshark release 4.6.6 fixes 1 vulnerability and 11 bugs. For WIndows, Npcap is updated to version 1.88. Didier Stevens Senior handler blog.DidierStevens.com (c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.
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An Example of Stack String in High Level Language, (Sat, May 23rd)
This week, I’m attending the SEC670[1] training (“Red Teaming Tools – Developing Windows Implants, Shellcode, Command and Control”). From my point of view, this training fits perfectly with FOR610 or FOR710 (malware analysis) because it addresses malware from the opposite: Instead of performing reverse engineering, you write malicious code! Always interesting to have another point…
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Cross-Platform NPM Stealer, (Fri, May 22nd)
I found a Node.js stealer that looked pretty well obfuscated. The file was not running out-of-the-box because it was uploaded on VT as “extracted-decoded.js” (and reformated). The SHA256 is 049300aa5dd774d6c984779a0570f59610399c71864b5d5c2605906db46ddeb9[1]. It did not run properly in a sandbox so only a static analysis was performed. The key point is that it is a cross-platform stealer…
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ISC Stormcast For Friday, May 22nd, 2026 https://isc.sans.edu/podcastdetail/9942, (Fri, May 22nd)
(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.
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Selective HTTP Proxying in Linux, (Thu, May 21st)
Recently, Rob wrote about a tool, Proxifier, that can intercept requests from specific processes. Proxifier is available for Windows, macOS, and Android. But I have not seen a generic Linux option yet. The advantage of a tool like Proxifier is the ability to target specific software. For debugging, reverse engineering, and similar tasks, selecting a…
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ISC Stormcast For Thursday, May 21st, 2026 https://isc.sans.edu/podcastdetail/9940, (Thu, May 21st)
(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.
