XCSSET Quickly Adapts to macOS 11 and M1-based Macs

Last year, Trend Micro reserchers first found XCSSET, which targeted Mac users by infecting Xcode projects. Initially reported as a malware family, in light of our recent findings it is now classified as an ongoing campaign. This latest update details our new research regarding XCSSET, including the ways in which it has adapted itself to work on both ARM64 and x86_x64 Macs, as well as other notable payload changes.

In our first blog post and technical brief on XCSSET, we discussed at length the dangers it posed to Xcode developers and how it exploited two macOS vulnerabilities to maximize what it can take from an infected machine. Our follow-up update covered the third exploit we found that takes advantage of other popular browsers in macOS to implant a Universal Cross-site Scripting (UXSS) injection.

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Source: Trend Micro