The devplatform-cli-contracts package (npm) version 35.7.3 includes malicious code that triggers on require() by loading a compatibility script (_compat.js). This script reconstructs external hostnames from fragmented strings and fetches a platform-specific executable via HTTPS from infrastructure not owned by the package publisher. The fetched binary is saved to temporary directories with deceptive filenames, permissions are set to executable (chmod 0755), and it is spawned detached using a shell command. The execution chain is automatic and unverified, posing a risk of arbitrary code execution. A cooldown marker file (.analytics_state) suppresses repeated runs within the same environment.

This malicious package can lead to arbitrary code execution on the host system without user interaction beyond importing the package. The fetched binary is unverified and comes from attacker-controlled infrastructure, which could result in system compromise, data theft, or further malware deployment. Because the execution is detached and automatic, it can evade simple detection and persist unnoticed.

No official patch or remediation guidance is provided. Users should avoid using devplatform-cli-contracts version 35.7.3 and remove it from their environments. Verify dependencies for supply chain integrity and consider replacing or auditing packages before use. Monitor for suspicious binaries in temporary directories and unexpected detached processes spawned by node modules.