A nearly identical exploit kit that targets critical vulnerabilities in both Chromium-based browsers and older versions of Windows is being actively used by at least four hacking groups, some of which have ties to the Chinese government.

Researchers from security firm Proofpoint said Wednesday that BlueMoon, the name they gave to the kit, chains three vulnerabilities together so the attackers using it can install malware of their choice. BlueMoon exploits two Chromium vulnerabilities and one in the kernel of Windows 10 (Oct. 2018 Update), Windows Server 2019, Windows 10 2004, Windows Server 2022, and the initial release of Windows 11. All three vulnerabilities have received patches in the past 24 hours.

Deployed rapidly, widely shared

The attacks lacked the stealth found in many campaigns. More often, hackers want to exploit newly discovered vulnerabilities sparingly to lengthen their longevity. Proofpoint hypothesized that one reason for the widely used and visible exploit chain was to take advantage of a “patch gap” in the Chromium supply chain, which spans the time a patch is available from developers and the time that patch is incorporated into browsers such as Chrome and Edge. Another likely contributor was the use of AI, which can often spot vulnerabilities faster than discovery performed solely by humans.

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The Brave web browser published a new round of benchmarks claiming its desktop browser uses less system resources than Chrome, Microsoft Edge, and Firefox — and also loads pages faster. The blog Linuxiac reports: According to Brave's testing, the browser used 44% less CPU, 28% less memory, and 10% less energy on average compared with the three competing browsers. It also completed page loads 20% faster while transferring 26% less inbound data and 39% less outbound data... - Brave averaged about 33% CPU usage, while Chrome used 47%, Edge 53%, and Firefox 78%. - For memory, Brave used about 1.2 GB, compared to 1.75 GB for Chrome, 1.62 GB for Edge, and 1.65 GB for Firefox. By stopping ads, analytics scripts, tracking pixels, and other third-party requests from loading, the browser has less network traffic and less work to do. In page-loading tests, Brave took about 4.4 seconds to fully load a page. Chrome took 5.1 seconds, Firefox 5.3 seconds, and Edge 6 seconds. However, when measuring Largest Contentful Paint, which is when the main content appears, Brave and Chrome both averaged about 2.4 seconds, with Edge and Firefox just behind at 2.5 seconds. This means Brave's main advantage comes after the main content is visible, since there are fewer background ads, trackers, analytics requests, and delayed scripts to process.

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Chinese retailer AliExpress has been caught fingerprinting visitors after one of the metrics—an outdated technique that measures inaudible sounds it sends to browsers—impeded a researcher's ability to use his bluetooth headphones.

Researcher Matthew Callaghan said he stumbled on the stealthy tracking by mistake. After loading the AliExpress homepage, audio from his phone stopped playing over his multipoint headphones, which accept connections from more than one device at a time. He set the headphones to play sounds from his phone except when his PC was producing audio. Each time he loaded AliExpress, the phone audio stopped. Each time he closed the tab the site was loaded into, the phone was once again audible.

Users can't hear it, but browsers can

While investigating the odd behavior, Callaghan said he found two highly obfuscated scripts. Together, they rendered a graph that analyzed the WebAudio readings of each visiting browser. This graph acted as an oscillator that measured Sawtooth waves, which are common in output from digital audio.

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McAfee says a Google Notes browser extension is replacing copied crypto payment details, putting wallet transfers at risk for Chrome, Brave, and Microsoft Edge users.