Windows Packer pkr_mtsi Powers Widespread Malvertising Campaigns with Multiple Malware

A custom Windows packer dubbed pkr_mtsi is fueling large-scale malvertising and SEO‑poisoning campaigns that deliver a broad range of information‑stealing and remote‑access malware, according to new research. First observed in the wild on April 24, 2025, the packer remains active and has continuously evolved over the past eight months, while retaining a stable behavioral core that makes it […]

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