The chaintest package on PyPI version 0.1.0 contains malicious code functioning as a cryptocurrency infostealer. It exfiltrates sensitive data from browsers, including cryptowallet extensions and local storage, as well as standalone applications like password managers and cryptowallets. The malware achieves persistence on different platforms, runs a keylogger that alters copied cryptocurrency addresses to attacker-controlled ones, and can execute remote commands from a command-and-control server. It also exfiltrates SSH keys, installs malicious browser extensions, and shares similarities with a known DPRK-linked campaign.