The dolyame-ui-calendar npm package version 35.1.8 advertises itself as a zero-dependency React calendar component but contains malicious code that fetches and executes opaque binaries from obfuscated Cloudflare Workers hosts or via DNS TXT record responses from suspicious domains. The malicious payload is written to hidden temporary files with executable permissions and spawned detached from the main process using platform-specific commands. Additional evasion techniques include dynamic property name concatenation and a telemetry-like facade to disguise the drop-and-execute behavior. The fetched binaries are unverified and unrelated to the package's advertised functionality.

This malicious package can execute arbitrary binaries on the host system without user consent, potentially leading to full system compromise, data theft, or further malware deployment. The covert DNS TXT record channel allows bypassing network egress controls that block unknown HTTP hosts, increasing the difficulty of detection and containment. The obfuscation and disguise as telemetry code further hinder detection by security tools.

No official patch or remediation is currently available. Users should immediately remove version 35.1.8 of dolyame-ui-calendar from their projects and avoid using this package. Audit dependencies for this package and replace it with a trusted alternative. Monitor for any signs of compromise if this package was previously installed. Check vendor advisories or npm security advisories for updates or official guidance.