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Prvaz12mars is a malicious package-publisher persona associated with a RubyGems software supply-chain campaign that distributed trojanized Ruby packages to covertly mine Monero on developer systems. The operation targeted developers seeking common libraries and utilities in the public RubyGems ecosystem, including through imitation of legitimate packages and typosquatting. Published packages modified normal library entry points so that malicious code executed when the gem was loaded or installed. The activity is linked to one of two related RubyGems clusters identified in the broader campaign. The Prvaz12mars-associated cluster published large numbers of trojanized gems that shared a common mining payload and used package naming patterns suggestive of automated bulk generation. The malware emphasized stealth and longevity: it delayed execution for hours to evade short-lived sandbox analysis, checked for virtualized, containerized, or debugging environments before running, reduced mining intensity when host activity was high, and established persistence on compromised systems. A more advanced variant in the same campaign family expanded beyond cryptomining into post-compromise propagation. That payload searched infected hosts for SSH private keys and trusted-host records, attempted to use existing trust relationships for lateral movement, and modified developer-environment assets to spread through local workflows. Observed propagation targets included Node.js package files, Python setup scripts, Ruby gem specifications, Dockerfiles, Git hooks, and Visual Studio Code extensions. This tradecraft indicates an opportunistic developer-focused supply-chain threat combining initial access through poisoned packages with persistence, defense evasion, credential access, lateral movement, and cryptocurrency theft objectives. Known associated personas in the same campaign include monib110 and Andrey78.
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