Recent weeks have seen a number of macOS-specific infostealers appear for sale in crimeware forums, including Pureland, MacStealer and Amos Atomic Stealer. Of these, Atomic Stealer has offered by far the most complete package, promising cybercriminals a full-featured if not particularly sophisticated infostealer. Atomic can grab account passwords, browser data, session cookies, and crypto wallets, and in the version being advertised on Telegram, threat actors can manage their campaigns through a web interface rented out from the developer for $1000 per month.
The threat actor, however, has been busy looking for other ways to target macOS users with a different version of Atomic Stealer. In this post, we take a closer look at how Atomic Stealer works and describe a previously unreported second variant. We also provide a comprehensive list of indicators to aid threat hunters and security teams defending macOS endpoints.
