Awhile back Bernardo Damele showed a cool method for utilizing an executable to deliver alphanumeric shellcode straight into memory. This was an awesome attack vector and allowed for AV and other security mechanisms such as HIPS and others to be circumvented extremely easy. You can download shellcodeexec here. Since then, Matthew Graeber came out with a technique for injecting shellcode straight into memory through Powershell. This technique eventually made it into the Social-Engineer Toolkit (SET) as a method for the Java Applet and never touching disk. You can read the blog post here.
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