This is not anything new and exciting¹, and should hopefully be familiar to some of you reading this. Some time ago I reversed the shellcode from Metasploit's download_exec module. It's a bit different from the rest of the stuff in MSF, because there's no source code with it, and it lacks certain features that the other shellcode[s] have (like being able to set the exit function).
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The FireEye Labs team posts blog entries under threat research to present and discuss cyber attacks and threat intelligence from a technical perspective. They cover the full spectrum of exploits and vulnerabilities, including advanced malware and targeted threats.