Apple computer users are suffering a growing number of ‘infostealer’ attacks across multiple regions and industries. These are a form of malicious software created to breach computer systems in order to steal sensitive information.

The Palo Alto Networks Unit42 research group has detected a 101 percent increase in macOS infostealers in the last two quarters of 2024. The researchers identified three particularly prevalent macOS infostealers: Poseidon, Atomic, and Cthulhu.

The developers of Atomic Stealer sell it as malware as a service (MaaS) in hacker forums and on Telegram. The Atomic Stealer operators usually distribute their malware via malvertising – the use of online advertising to spread malware. This typically involves injecting malicious or malware-laden advertisements into legitimate online advertising networks and webpages. It is capable of stealing notes and documents, browser data such as passwords, and cookies, cryptocurrency wallets, and instant messaging data. Atomic Stealer, also known as AMOS was first discovered in April 2023.