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As previously reported, threat actors use Apple’s ad hoc distribution method, through distribution operations known as “Super Signature services,” along with Apple’s Enterprise Signature distribution scheme, to target victims. Now, the scam campaign is using other means including TestFlight Signature and WebClips to bypass the App Store’s security screening. As Sophos states, TestFlight is used for testing the beta version of apps before they head to the App Store. It is used for small internal tests, sent out to 100 users by email, and public beta tests distributed to up to 10,000 users. The internal tests don’t require an App Store security review, which is ideal for threat actors. “Unfortunately, just as we’ve seen happen with other alternative app distribution schemes supported by Apple, “TestFlight Signature” is available as a hosted service for alternative iOS app deployment, making it all too simple for malware authors to abuse,” stated Sophos researcher Jagadeesh Chandraiah. “These third-party services are extensively abused by CryptoRom authors.” TestFlight Signature only needs an IPA file to be sent, and the review process is “less stringent” than the App Store review, according to users. Sophos has spotted fake sites that disguised themselves as cryptocurrency mining firm BitFury peddling fake apps through Test Flight. CryptoRom also used iOS WebClips to dupe iPhone users, as they were sent malicious URLs via the service. WebClips offers “fast access to favorite webpages or links, as Apple highlights, with Sophos stating that it can be used to make fake apps look more legit. Chandraiah explains: “While investigating one of the CryptoRom URLs, we found related IPs that were hosting App store lookalike pages with a similar template, but with varying names and icons. The “apps” included one that mimics the popular Robinhood trading application, called ‘RobinHand.’ Its logo is similar to that of Robinhood.” For a better look at CryptoRom’s hacking methods, check out the full Sophos Labs report. It’s a good idea to keep your devices protected from malware threats, and the best antivirus apps can offer a helping hand. Plus, if you’re wondering how to improve your Mac’s security and privacy, we’ve got you covered.
