A previously undocumented threat activity cluster has been attributed to an ongoing malicious campaign targeting education and healthcare sectors in the U.S. since at least December 2025. The campaign is being tracked by Cisco Talos under the moniker UAT-10027. The end goal of the attacks is to deliver a never-before-seen backdoor codenamed Dohdoor. “Dohdoor utilizes the
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Cybersecurity researchers have disclosed details of a new botnet loader called Aeternum C2 that uses a blockchain-based command-and-control (C2) infrastructure to make it resilient to takedown efforts. “Instead of relying on traditional servers or domains for command-and-control, Aeternum stores its instructions on the public Polygon blockchain,” Qrator Labs said in a report shared with The Hacker News. “This network
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Cloudflare has addressed a security vulnerability impacting its Automatic Certificate Management Environment (ACME) validation logic that made it possible to bypass security controls and access origin servers. “The vulnerability was rooted in how our edge network processed requests destined for the ACME HTTP-01 challenge path (/.well-known/acme-challenge/*),” the web infrastructure company’s Hrushikesh Deshpande, Andrew Mitchell, and Leland Garofalo said.
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A Telegram-based guarantee marketplace known for advertising a broad range of illicit services appears to be winding down its operations, according to new findings from Elliptic. The blockchain intelligence company said Tudou Guarantee has effectively ceased transactions through its public Telegram groups following a period of significant growth. The marketplace is estimated to have processed
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