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LunaRebirth
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Joined: 05 Sep 2013
Posts: 20
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 Posted: Wed May 13, 2015 4:25 pm Post subject: WriteProcessMemory on an Android VM |
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Hello,
I'm using Andy for Android VM on my PC.
After writing a memory scanner, I'm trying to edit the values of each found address.
My program finds all values correctly without issues.
However, I'm getting Access Denied on WriteProcessMemory.
I've also tried using VirtualProtectEx to change the rights of each address, but it still isn't working.
| Code: | //...
phandle = OpenProcess(PROCESS_VM_OPERATION | PROCESS_VM_WRITE | PROCESS_VM_READ, false, pid);
//...
MEMORY_BASIC_INFORMATION mBI;
DWORD OLDPROTECT;
double sResult;
int asz = val_size;
for (int xy = 0; xy < search_results[cur_result].size(); xy++) {
if (ReadProcessMemory(phandle,(void*)search_results[cur_result][xy],&sResult,8,0) != 0) {
if (sResult==double_val) {
VirtualQueryEx(phandle, (void*)search_results[cur_result][xy], &mBI, sizeof(MEMORY_BASIC_INFORMATION));
bool isWritable=(mBI.Protect == PAGE_READWRITE || mBI.Protect == PAGE_WRITECOPY || mBI.Protect == PAGE_EXECUTE_READWRITE || mBI.Protect == PAGE_EXECUTE_WRITECOPY);
if (!isWritable) {
VirtualProtectEx(phandle,(void*)search_results[cur_result][xy],8,PAGE_EXECUTE_READWRITE,&OLDPROTECT);
}
WriteProcessMemory(phandle,(void*)search_results[cur_result][xy],&double_ans,8,0);
if (!isWritable) {
VirtualProtectEx(phandle,(void*)search_results[cur_result][xy],8,OLDPROTECT,&OLDPROTECT);
}
}
}
} |
Any help is appreciated.
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LunaRebirth
Newbie cheater
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Joined: 05 Sep 2013
Posts: 20
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| Posted: Thu May 14, 2015 11:37 am Post subject: |
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| Can anyone help with this??
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Dark Byte
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Joined: 09 May 2003
Posts: 25813
Location: The netherlands
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| Posted: Thu May 14, 2015 12:43 pm Post subject: |
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can cheat engine do it without activating kernelmode read/write process memory?
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LunaRebirth
Newbie cheater
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Joined: 05 Sep 2013
Posts: 20
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| Posted: Thu May 14, 2015 1:11 pm Post subject: |
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| Dark Byte wrote: | | can cheat engine do it without activating kernelmode read/write process memory? |
Yes, I checked my Cheat Engine settings, and Kernel mode is off.
As for the code posted above, VirtualProtectEx is failing with error 5 (Access Denied) even when running as administrator.
WriteProcessMemory then returns 0 (failed.)
The second VirtualProtectEx fails with error 87 (Incorrect Parameter.)
I don't see anything wrong, so I've no idea why this is happening.
Also tried just using PROCESS_ALL_ACCESS on OpenProcess, and no change in the program.
EDIT:
Trying
| Code: | if (VirtualProtectEx(phandle,(void*)search_results[cur_result][xy],8,PAGE_EXECUTE_READWRITE,0)==0)
cout << " " << GetLastError() << endl; |
prints Error 998 (ERROR_NOACCESS)
(using 0 as last param instead of a DWORD pointer)
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Dark Byte
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Joined: 09 May 2003
Posts: 25813
Location: The netherlands
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| Posted: Thu May 14, 2015 1:44 pm Post subject: |
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try process_all_access instead for openprocess (be sure to run as admin and obtain SeDebugPrivileve
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LunaRebirth
Newbie cheater
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Joined: 05 Sep 2013
Posts: 20
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| Posted: Thu May 14, 2015 4:04 pm Post subject: |
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Tried PROCESS_ALL_ACCESS, ran as admin, and also successfully set SeDebugPrivilege to true.
No change in program.
Ughhhh.......
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Dark Byte
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Location: The netherlands
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| Posted: Thu May 14, 2015 4:14 pm Post subject: |
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you're running any other security programs and forgot to whitelist your program? (e.g. something that prevents writing to other processes)
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LunaRebirth
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Joined: 05 Sep 2013
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| Posted: Thu May 14, 2015 5:16 pm Post subject: |
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I don't think so.
My tool works on PC apps and processes, but isn't working on any Android VM emulators.
Cheat Engine works fine, but it's a huge hassle changing certain values each time I start the game on Android.
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Dark Byte
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Location: The netherlands
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| Posted: Thu May 14, 2015 6:30 pm Post subject: |
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no idea about your code, but try ce's lua functions to automate that
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LunaRebirth
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Joined: 05 Sep 2013
Posts: 20
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| Posted: Fri May 15, 2015 7:58 pm Post subject: |
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Okay so I tried your idea, and found a Lua code you had posted on http://forum.cheatengine.org/viewtopic.php?p=5554658&sid=1b01a6ae7abff7c1c1dc5859f3d91e90
| Code: |
function FindAndReplaceDouble(find, replace)
ms=createMemScan()
ms.firstScan(soValueBetween, vtDouble, rtTruncated, find,find,0,0xffffffffffffffff,'+W*X-C', fsmAligned,'4', false, false, false, false)
fl=createFoundList(ms)
ms.waitTillDone()
fl.initialize()
if fl.Count>0 then
local i
for i=0,fl.Count-1 do
if readDouble(fl.Address[i])==find then
writeDouble(fl.Address[i],replace)
end
end
end
fl.destroy()
ms.destroy()
end |
I tried doing FindAndReplaceDouble(.75,3) and it crashed my entire PC with error WHEA_UNCORRECTABLE_ERROR
tried twice with the same result.
Quite an annoyance, though I assume maybe some functions from the code have been changed or no longer exist???
Edit:
Same result from trying with strings..
http://www.cheatengine.org/forum/viewtopic.php?p=5581806&sid=7505bc57fb9ca80718928776e64b2389:
| Code: | ms=createMemScan()
ms.firstScan(soExactValue,vtString,0,"3.6","",0, 0xffffffffffffffff, "", fsmNotAligned, "1", false, false, false, false)
ms.waitTillDone()
f=createFoundList(ms);
f.initialize();
resultToWrite=stringToByteTable("40.6"..string.char(0))
for i=0,f.Count-1 do
writeString(f.Address[i], "40.6")
writeBytes(("0x"..f.Address[i])+4,0)
end
f.destroy()
ms.destroy() |
EDIT2:
Figured it out..
Had to change the start & end addresses to be smaller.
Thanks!
EDIT3:
Spoke too soon...
I created an entire window using Lua on Cheat Engine and tested everything on a test game. It was working wonderful and quick.
Then I loaded the Android VM to try on the actual game, and NOTHING HAPPENED.
Literally spent the past few hours learning Lua syntax and functions for it not to work.
I don't understand how the VM is filtering everything EXCEPT Cheat Engine's manual value changing???
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