Shellcode Formatter

Format Shellcode in various formats

#!/usr/bin/env python3
import base64

# Edit this line with the path to the binary file containing shellcode you are converting
with open('/home/user/Downloads/payload.bin', 'rb') as sc_handle:
    sc_data = sc_handle.read()

# Just raw binary blog base64 encoded
encoded_raw = base64.b64encode(sc_data)

# Print in "standard" shellcode format \x41\x42\x43....
binary_code = ''
fs_code = ''
for byte in sc_data:
    binary_code += "\\x" + hex(byte)[2:].zfill(2)
    # this is for f#
    fs_code += "0x" + hex(byte)[2:].zfill(2) + "uy;"

# Convert this into a C# style shellcode format
cs_shellcode = "0" + ",0".join(binary_code.split("\\")[1:])

# Base 64 encode the C# code (for use with certain payloads :))
encoded_cs = base64.b64encode(cs_shellcode.encode())

# Write out the files to disk (edit this path as needed)
with open('formatted_shellcode.txt', 'w') as format_out:
    format_out.write("Binary Blob base64 encoded:\n\n")
    format_out.write(encoded_raw.decode('ascii'))
    format_out.write("\n\nStandard shellcode format:\n\n")
    format_out.write(binary_code)
    format_out.write("\n\nC# formatted shellcode:\n\n")
    format_out.write(cs_shellcode)
    format_out.write("\n\nBase64 Encoded C# shellcode:\n\n")
    format_out.write(encoded_cs.decode('ascii'))
    format_out.write("\n\nF# Shellcode:\n\n")
    format_out.write(fs_code)
    format_out.write("\n")

$fileName = "C:\Users\User\Desktop\payload.bin"
$fileContent = [IO.File]::ReadAllBytes($fileName)
$filecontentsencoded = [convert]::ToBase64String($fileContent)
"Binary Blob base64 encoded:`n`n" + $filecontentsencoded | set-content ($fileName + ".b64")

$scformat = '\x' + (($fileContent | ForEach-Object ToString x2) -join '\x')
"`nStandard shellcode format:`n`n" + $scformat | add-content ($fileName + ".b64")

$csharpformat = '0x' + (($fileContent | ForEach-Object ToString x2 | ForEach-Object { $_ + ',' }) -join '0x')
$csharpformat = $csharpformat.SubString(0, $csharpformat.Length-1)
"`nC# formatted shellcode:`n`n" + $csharpformat | add-content ($fileName + ".b64")

$Bytes = [System.Text.Encoding]::UTF8.GetBytes($csharpformat)
$EncodedText =[Convert]::ToBase64String($Bytes)
"`nBase64 Encoded C# shellcode:`n`n" + $EncodedText | add-content ($fileName + ".b64")

$fsharpformat = '0x' + (($fileContent | ForEach-Object ToString x2 | ForEach-Object { $_ + 'uy;' }) -join '0x')
$fsharpformat = $fsharpformat.SubString(0, $fsharpformat.Length-1)
"`nF# formatted shellcode:`n`n" + $fsharpformat | add-content ($fileName + ".b64")

Update 22-03-2022

#!/usr/bin/env python3
import base64

# Edit this line with the path to the binary file containing shellcode you are converting
with open('.\Helloworld.bin', 'rb') as sc_handle:
    sc_data = sc_handle.read()

# Just raw binary blog base64 encoded
encoded_raw = base64.b64encode(sc_data)
n=100
chunks = [encoded_raw[i:i+n] for i in range(0, len(encoded_raw), n)]

# Print in "standard" shellcode format \x41\x42\x43....
binary_code = ''
fs_code = ''
for byte in sc_data:
    binary_code += "\\x" + hex(byte)[2:].zfill(2)
    # this is for f#
    fs_code += "0x" + hex(byte)[2:].zfill(2) + "uy;"

binary_chunks = [binary_code[i:i+n] for i in range(0, len(binary_code), n)]


# Convert this into a C# style shellcode format
cs_shellcode = "0" + ",0".join(binary_code.split("\\")[1:])

# Base 64 encode the C# code (for use with certain payloads :))
encoded_cs = base64.b64encode(cs_shellcode.encode())

# Write out the files to disk (edit this path as needed)
with open('formatted_helloworld_shellcode.txt', 'w') as format_out:
    format_out.write("Binary Blob base64 encoded:\n\n")
    format_out.write(encoded_raw.decode('ascii'))
    format_out.write("\n\nStandard shellcode format:\n\n")
    format_out.write(binary_code)
    format_out.write("\n\nC# formatted shellcode:\n\n")
    format_out.write(cs_shellcode)
    format_out.write("\n\nBase64 Encoded C# shellcode:\n\n")
    format_out.write(encoded_cs.decode('ascii'))
    format_out.write("\n\nF# Shellcode:\n\n")
    format_out.write(fs_code)
    format_out.write("\n")
    format_out.write("\n\nchunk base64 Shellcode:\n\n")
    for item in chunks:
        format_out.write(f"\"{item.decode('ascii')}\"\n")
    format_out.write("\n\nChunk Standard shellcode format:\n\n")
    for item in binary_chunks:
        format_out.write(f"\"{item}\"\n")