Guildma (Astaroth) malware infection from Brazilian Portuguese email, (Tue, Sep 1st)
Introduction On Monday 2026-08-31, I used a link from a malicious Brazilian Portuguese email to infect a Windows host in my lab. This was a Guildma (Astaroth) malware infection. The link from the email is geofenced for Brazil, meaning that it would only deliver the malware if I checked it from a Brazil-based IP address. Otherwise, it would send a legitimate installer (in this case for Android Studio) and not the malware. Furthermore, my web browser and operating system needed to use Brazilian…
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