问题
I have 2 programs written in c#, first one called "ScanMe" contains a string variable that contains value "FINDMEEEEEEE", and a double variable that has the value of 1546.22915487. And the other program called "MemoryScan" reads all the memory of the first program. I want to get the memory address of the string variable of that process
When i execute "MemoryScan" and reads all the memory of "ScanMe" process, then i try to find the byte array of the string in all the data scanned and i get nothing. If i try to find the double i get the specific memory address and also i can change its value, but when i try to do that with the string variable i cant cause i dont even get the address of that string variable.
ScanMe and MemoryScan Code:
class Program
{
public static string FindMeString = "FINDMEEEEEEE";
public static double FindMeDouble = 1546.22915487;
static void Main(string[] args)
{
while (FindMeDouble == 1546.22915487)
{
System.Threading.Thread.Sleep(2000);
}
Console.WriteLine(FindMeDouble.ToString());
Console.ReadLine();
}
}
using System;
using System.Collections.Generic;
using System.Runtime.InteropServices;
namespace MemoryScan
{
class MemoryController
{
// REQUIRED CONSTS
const int PROCESS_QUERY_INFORMATION = 0x0400;
const int MEM_COMMIT = 0x00001000;
const int PAGE_READWRITE = 0x04;
const int PROCESS_WM_READ = 0x0010;
readonly Dictionary<IntPtr, byte[]> Regions = new Dictionary<IntPtr, byte[]>();
readonly List<SearchResult> _results = new List<SearchResult>();
// REQUIRED METHODS
[DllImport("kernel32.dll")]
public static extern IntPtr OpenProcess(int dwDesiredAccess, bool bInheritHandle, int dwProcessId);
[DllImport("kernel32.dll")]
public static extern bool ReadProcessMemory(IntPtr hProcess, IntPtr lpBaseAddress, byte[] lpBuffer, uint dwSize, ref int lpNumberOfBytesRead);
[DllImport("kernel32.dll")]
static extern void GetSystemInfo(out SystemInfo lpSystemInfo);
[DllImport("kernel32.dll", SetLastError = true)]
static extern int VirtualQueryEx(IntPtr hProcess, IntPtr lpAddress, out MEMORY_BASIC_INFORMATION lpBuffer, int dwLength);
public enum ProcessorArchitecture
{
X86 = 0,
X64 = 9,
Arm = -1,
Itanium = 6,
Unknown = 0xFFFF
}
// REQUIRED STRUCTS
[StructLayout(LayoutKind.Sequential)]
public struct SystemInfo
{
public ProcessorArchitecture ProcessorArchitecture;
public uint PageSize;
public IntPtr MinimumApplicationAddress;
public IntPtr MaximumApplicationAddress;
public IntPtr ActiveProcessorMask;
public uint NumberOfProcessors;
public uint ProcessorType;
public uint AllocationGranularity;
public ushort ProcessorLevel;
public ushort ProcessorRevision;
}
[StructLayout(LayoutKind.Sequential)]
public struct MEMORY_BASIC_INFORMATION
{
public IntPtr BaseAddress;
public IntPtr AllocationBase;
public uint AllocationProtect;
public IntPtr RegionSize;
public uint State;
public uint Protect;
public uint Type;
}
public void FindProcessMemory(int processId)
{
// getting minimum & maximum address
SystemInfo sys_info;
GetSystemInfo(out sys_info);
uint max_Address = (uint)sys_info.MaximumApplicationAddress;
// opening the process with desired access level
IntPtr processHandle = OpenProcess(PROCESS_QUERY_INFORMATION | PROCESS_WM_READ, false, processId);
IntPtr current = IntPtr.Zero;
int bytesRead = 0; // number of bytes read with ReadProcessMemory
int dwLength = Marshal.SizeOf(typeof(MEMORY_BASIC_INFORMATION));
while ((uint)current < max_Address && VirtualQueryEx(processHandle, current, out MEMORY_BASIC_INFORMATION mem_basic_info, dwLength) != 0)
{
// if this memory chunk is accessible
if (mem_basic_info.Protect == PAGE_READWRITE && mem_basic_info.State == MEM_COMMIT)
{
byte[] buffer = new byte[(int)mem_basic_info.RegionSize];
// read everything in the buffer above
if (ReadProcessMemory(processHandle, mem_basic_info.BaseAddress, buffer, (uint)mem_basic_info.RegionSize, ref bytesRead))
{
Regions.Add(mem_basic_info.BaseAddress, buffer);
}
else
Console.WriteLine($"Error code: Marshal.GetLastWin32Error()");
}
// move to the next memory chunk
current = IntPtr.Add(mem_basic_info.BaseAddress, mem_basic_info.RegionSize.ToInt32());
}
byte[] data = System.Text.Encoding.Unicode.GetBytes("FINDMEEEEEEE");
foreach (IntPtr address in Regions.Keys)
{
foreach (int i in ByteSearch.AllIndexOf(Regions[address], data))
_results.Add(new SearchResult(IntPtr.Add(address, i), data));
}
Console.ReadLine();
}
}
public static class ByteSearch
{
static int[] createTable(byte[] pattern)
{
int[] table = new int[256];
for (int i = 0; i < table.Length; i++)
table[i] = pattern.Length;
for (int i = 0; i < pattern.Length - 1; i++)
table[Convert.ToInt32(pattern[i])] = pattern.Length - i - 1;
return table;
}
public static bool matchAtOffset(byte[] toSearch, byte[] pattern, int index)
{
if (index + pattern.Length > toSearch.Length)
return false;
for (int i = 0; i < pattern.Length; i++)
{
if (toSearch[i + index] != pattern[i])
return false;
}
return true;
}
public static bool Contains(byte[] toSearch, byte[] pattern)
{
return FirstIndexOf(toSearch, pattern) != -1;
}
public static int FirstIndexOf(byte[] toSearch, byte[] pattern)
{
int[] table = createTable(pattern);
int position = pattern.Length - 1;
while (position < toSearch.Length)
{
int i;
for (i = 0; i < pattern.Length; i++)
{
if (pattern[pattern.Length - 1 - i] != toSearch[position - i])
break;
if (i == pattern.Length - 1)
return position - i;
}
position += table[Convert.ToInt32(toSearch[position - i])];
}
return -1;
}
public static int LastIndexOf(byte[] toSearch, byte[] pattern)
{
int ret = -1;
int[] table = createTable(pattern);
int position = pattern.Length - 1;
while (position < toSearch.Length)
{
int i;
bool found = false;
for (i = 0; i < pattern.Length; i++)
{
if (pattern[pattern.Length - 1 - i] != toSearch[position - i])
break;
if (i == pattern.Length - 1)
{
ret = position - i;
found = true;
}
}
if (found)
position++;
else
position += table[Convert.ToInt32(toSearch[position - i])];
}
return ret;
}
public static int[] AllIndexOf(byte[] toSearch, byte[] pattern)
{
List<int> indices = new List<int>();
int[] table = createTable(pattern);
int position = pattern.Length - 1;
while (position < toSearch.Length)
{
int i;
bool found = false;
for (i = 0; i < pattern.Length; i++)
{
if (pattern[pattern.Length - 1 - i] != toSearch[position - i])
break;
if (i == pattern.Length - 1)
{
indices.Add(position - i);
found = true;
}
}
if (found)
position++;
else
position += table[Convert.ToInt32(toSearch[position - i])];
}
return indices.ToArray();
}
}
public class SearchResult
{
public SearchResult(IntPtr add, byte[] value)
{
Address = add;
Buffer = value;
}
public IntPtr Address { get; set; }
public byte[] Buffer { get; set; }
}
}
Why i cant find the string and when i try to find the double i find it with no problem and even also i can change its value with the extern writeprocessmemory? Thanks.
回答1:
I'm not sure I could reproduce your exact condition, since you didn't provide a minimal reproducible example. However, I got it up and running - with similar results. I then figured out the following:
You are not checking the return value of ReadProcessMemory
. MSDN says
If the function fails, the return value is 0 (zero). To get extended error information, call GetLastError.
The 0
will be mapped to false
, depending on the PInvoke signature you use.
To get the last error, use Marshal.GetLastWin32Error()
. On my PC, the error code was 299 and
MSDN says
ERROR_PARTIAL_COPY
299 (0x12B)
Only part of a ReadProcessMemory or WriteProcessMemory request was completed.
At the same time, the number of bytes read (ref bytesRead
) is 0, so it didn't read the process' memory.
See this related SO question about this error code.
来源:https://stackoverflow.com/questions/57717504/reading-all-process-memory-to-find-address-of-a-string-variable-c-sharp