CSS-JS Steganography in Fake Flash Player Update Malware

This summer, MalwareBytes researcher Jérôme Segura wrote an article about how criminals use image files (.ico) to hide JavaScript credit card stealers on compromised e-commerce sites.

In a tweet, Affable Kraut also reported another similar obfuscation technique using .ico files to conceal JavaScript skimmers.

Just something I’ve noticed more recently with digital skimmers/#magecart. Obfuscated code that has a weird google-analytics[.]com URL in it, which is the proper Google controlled domain.

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