Please help to identify the following description belonging to which technique in MITRE and the corresponding tactics: XCSSET adds malicious code to a host's Xcode projects by enumerating CocoaPods <code>target_integrator.rb</code> files under the <code>/Library/Ruby/Gems</code> folder or enumerates all <code>.xcodeproj</code> folders under a given directory. XCSSET then downloads a script and Mach-O file into the Xcode project folder.