Registriert seit: 22. Dez 2005
57 Beiträge
Delphi 5 Enterprise
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Re: selbstlöschende Datei (Exe die ein Bild enthält)
21. Sep 2007, 09:30
Das ist ja lustig. Ich hab gerade gestern etwas wiedergefunden, was als vergessen galt. "Lösch Dich Selber" ist der Titel des Monsters. Der Code ist allerdings ungetestet!!
Delphi-Quellcode:
// A procedure in assembler that deletes the main executable file - while
// running. Neat.
procedure DeleteSelf;
{
Note, this version will only work, as long as the functions are imported through
the import table. This is true for any Win32 app and Kernel32.dll!
Anyway, if you introduce symbol names, that conflict with the function names,
this code is likely to break!
}
var
szModuleName: array[0..MAX_PATH - 1] of Char;
pExitProcess,
pDeleteFile,
pFreeLibrary,
pUnmapViewOfFile: Pointer;
hModule: THandle;
asm
(*** Get real address of ExitProcess ***)
{ Dereference the function addresses from the jump table
I'll briefly explain on this first function ('ExitProcess')
Load effective address. EAX points to code like FF 25 XX XX XX XX -> jmp ds:XXXXXXXX }
lea eax, [ExitProcess]
{ Ignore the jump instruction (i.e. FF 25) }
mov eax, [eax+2]
{ EAX holds now the XX XX XX XX from above metacode, i.e. a pointer to the 'real'
address }
mov eax, [eax]
{ EAX now holds the 'real' address of the function ExitProcess within our realm }
mov pExitProcess, eax
{ The following code works accordingly ...}
(*** Get real address of DeleteFileA ***)
lea eax, [DeleteFileA]
mov eax, [eax+2]
mov eax, [eax]
mov pDeleteFile, eax
(*** Get real address of FreeLibrary ***)
lea eax, [FreeLibrary]
mov eax, [eax+2]
mov eax, [eax]
mov pFreeLibrary, eax
(*** Get real address of UnmapViewOfFile ***)
lea eax, [UnmapViewOfFile]
mov eax, [eax+2]
mov eax, [eax]
mov pUnmapViewOfFile, eax
(*** Now the "main code" ***)
push 0
call GetModuleHandleA
mov hModule, eax
(*** Got module handle of this instance ***)
push MAX_PATH
lea eax, szModuleName
push eax
push hModule
call GetModuleFileNameA
(*** szModuleName now holds the file name of our instance's module ***)
call GetVersion
(*** Checking for Windows 9x / Windows NT platform ***)
test eax, $80000000
jz @@NTplatform
//@@9xplatform:
lea eax, szModuleName
push system.ExitCode
push 0
push eax
push pExitProcess
push hModule
push pDeleteFile
push pFreeLibrary
ret
@@NTplatform:
push 4
call CloseHandle;
lea eax, szModuleName
push system.ExitCode
push 0
push eax
push pExitProcess
push hModule
push pDeleteFile
push pUnmapViewOfFile
ret
end;
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