Welcome to Source Code: Decipher’s behind the scenes look at the weekly news with input from our sources. Topping the headlines this week, Microsoft researchers released details for a recently patched vulnerability in macOS. Also in the news, U.S. Cyber Command exposed a number of open-source tools that it said are being used by the MuddyWater APT. And, researchers with Cisco Talos highlighted a phishing campaign that relied on "complex" obfuscation tactics in order to deliver three different RATs.