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The first ThreatsDay Bulletin of 2026 lands on a day that already feels symbolic — new year, new breaches, new tricks. If the past twelve months taught defenders anything, it’s that threat actors don’t pause for holidays or resolutions. They just evolve faster. This week’s round-up shows how subtle shifts in behavior, from code tweaks to job scams, are rewriting what “cybercrime” looks like in

Cybersecurity researchers have disclosed details of what appears to be a new strain of Shai Hulud on the npm registry with slight modifications from the previous wave observed last month. The npm package that embeds the novel Shai Hulud strain is "@vietmoney/react-big-calendar," which was uploaded to npm back in March 2021 by a user named "hoquocdat." It was updated for the first time on

KrebsOnSecurity.com celebrates its 16th anniversary today! A huge "thank you" to all of our readers -- newcomers, long-timers and drive-by critics alike. Your engagement this past year here has been tremendous and truly a salve on a handful of dark days. Happily, comeuppance was a strong theme running through our coverage in 2025, with a primary focus on entities that enabled complex and globally-dispersed cybercrime services.

Privacy may be dead, but civilians are turning conventional wisdom on its head by surveilling the cops as much as the cops surveil them.

A China-linked advanced persistent threat (APT) group has been attributed to a highly-targeted cyber espionage campaign in which the adversary poisoned Domain Name System (DNS) requests to deliver its signature MgBot backdoor in attacks targeting victims in Türkiye, China, and India. The activity, Kaspersky said, was observed between November 2022 and November 2024. It has been linked to a

Cybersecurity researchers have discovered a new variant of a macOS information stealer called MacSync that's delivered by means of a digitally signed, notarized Swift application masquerading as a messaging app installer to bypass Apple's Gatekeeper checks. "Unlike earlier MacSync Stealer variants that primarily rely on drag-to-terminal or ClickFix-style techniques, this sample adopts a more

Apple has been fined €98.6 million ($116 million) by Italy's antitrust authority after finding that the company's App Tracking Transparency (ATT) privacy framework restricted App Store competition. The Italian Competition Authority (Autorità Garante della Concorrenza e del Mercato, or AGCM) said the company's "absolute dominant position" in app distribution allowed it to "unilaterally impose"

Jamf security experts have found a new version of MacSync Stealer. Disguised as a zk-call app, it uses official notarization to bypass security and steal your saved passwords.

A new report from Check Point Research reveals a growing trend of cyber criminals recruiting employees at banks, telecoms, and tech giants. Learn how hackers use the darknet and Telegram to offer payouts up to $15,000 for internal access to companies like Apple, Coinbase, and the Federal Reserve.

This week’s ThreatsDay Bulletin tracks how attackers keep reshaping old tools and finding new angles in familiar systems. Small changes in tactics are stacking up fast, and each one hints at where the next big breach could come from. From shifting infrastructures to clever social hooks, the week’s activity shows just how fluid the threat landscape has become. Here’s the full rundown of what