你被邀请：通过 Google 日历邀请和潜在不需要的应用程序（PUAs）交付恶意软件

发布于 8 月 3 日

Date and Discovery: On March 19th, 2025, a package os-info-checker-es6 was found and initially found not to do what it claimed.
- Package Information on npm: The package lacked a README file and showed limited information. It seemed to fetch system information.
Smelly Code: The preinstall.js file of the package raised red flags with an eval() call and base64-encoded input. The input was from a decode() call on a native Node module, resulting in Unicode "Private Use Access" characters.
Reverse Engineering: The small Rust binary within the package didn't show expected OS information calls. The actual code found in run.txt was console.log('Check');, raising more questions.
Dependent Packages: Several published packages depended on os-info-checker-es6, including copies of other packages. None called the decode function.
Final Version: On May 7th, 2025, a new version of os-info-checker-es6 (1.0.8) was released with a longer obfuscated string and the eval call commented out. The decoded string contained malware code to fetch a Google Calendar link and a base64-encoded payload URL.
Indicators of Compromise: Compromised packages include os-info-checker-es6, skip-tot, vue-dev-serverr, vue-dummyy, and vue-bit. IP 140.82.54[.]223 and URL https://calendar.app[.]google/t56nfUUcugH9ZUkx9 are also associated.
Acknowledgement: Vector35 provided a trial license for their Binary Ninja tool to aid in the investigation.

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