Microsoft has revealed details of a large-scale malvertising campaign that is believed to have impacted over one million devices worldwide as part of an opportunistic attack aimed at stealing sensitive information.
The tech giant, which discovered the activity in early December 2024, is tracking it under the broader Storm-0408 umbrella, which refers to a group of attackers known for distributing remote access or information-stealing malware via phishing, search engine optimisation (SEO), or malvertising.
“The attack originated from illegal streaming websites embedded with malvertising redirectors, leading to an intermediary website where the user was then redirected to GitHub and two other platforms,” the Microsoft Threat Intelligence team stated. “The campaign impacted a wide range of organizations and industries, including both consumer and enterprise devices, highlighting the indiscriminate nature of the attack.”
The campaign relied on GitHub to deliver initial access payloads, but payloads were also detected on Discord and Dropbox. The GitHub repositories were removed, but the numbe
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