Malvertising Campaign Delivers AMOS and Odyssey Stealer via Fake macOS Tool Sites

A sophisticated cybercriminal campaign has been identified targeting macOS users, particularly developers, by leveraging fake download portals that impersonate trusted platforms such as Homebrew, LogMeIn, and TradingView. The attackers have registered over 85 domains that closely mimic the legitimate sites of these popular tools, using convincing branding and user interfaces to deceive visitors. These malicious domains are promoted through Google Ads, ensuring that they appear prominently in search results and increasing the likelihood that unsuspecting users will visit them. Once on the fake sites, users are instructed to copy and execute a curl command in their Terminal, which initiates the download and installation of infostealing malware. The primary payloads delivered in this campaign are AMOS (Atomic macOS Stealer) and Odyssey Stealer, both of which are capable of harvesting sensitive information such as system details, browser data, and cryptocurrency credentials from infected machines. The campaign employs advanced social engineering tactics, including clipboard manipulation and command obfuscation, to increase the success rate of infections. Researchers from Hunt.io have mapped the infrastructure supporting this operation, noting that the attackers reuse IP addresses and SSL certificates across multiple domains, indicating a persistent and well-organized effort. The infrastructure has been active for several years, with some IP addresses registered under personal names, suggesting a degree of operational continuity and experience. The campaign does not rely on exploiting software vulnerabilities but instead exploits user trust in widely used open-source and financial tools. The use of Google Ads as a distribution vector highlights the attackers' willingness to invest in paid advertising to reach their targets. The campaign's focus on the developer community is particularly concerning, as compromised developer systems could lead to broader supply chain risks. Security researchers have emphasized the importance of verifying download sources and being wary of unsolicited installation instructions, especially those involving Terminal commands. The ongoing nature of the campaign, with continuous adaptation of infrastructure and tactics, underscores the need for vigilance among macOS users. The discovery of this campaign began with public reports from independent researchers, which were then corroborated and expanded upon by threat intelligence teams. The scale and persistence of the operation suggest that it is likely to continue evolving, posing a significant threat to the macOS ecosystem. Organizations are advised to educate users about the risks of malvertising and to implement technical controls to block access to known malicious domains. The campaign demonstrates the increasing sophistication of social engineering attacks targeting macOS, a platform often perceived as less vulnerable than Windows.