The North Korean state-sponsored hacking group Lazarus has been identified as the source of a sophisticated supply chain attack that targets software developers. The group employed a malicious Node Package Manager (NPM) package named "postcss-optimizer" to deliver malware. This package deceptively mimics the widely used postcss libraries. Security researchers at Socket discovered the malicious package and linked it directly to Lazarus Group, noting its code-level similarities to previous campaigns. The "postcss-optimizer" package has been downloaded 477 times and serves as a vector for deploying BeaverTail malware.
Once installed, BeaverTail functions as both an infostealer and a malware loader. It is designed to compromise systems across Windows, macOS, and Linux. The malware's targets include browser cookies, credentials, and cryptocurrency wallet files. The information is exfiltrated to a command-and-control server. It is suspected to deliver secondary payloads such as InvisibleFerret, a known backdoor associated with Lazarus. The attackers used the deceptive npm registry alias "yolorabbit" to further confuse developers, who might have believed they were downloading legitimate software.