procedure deleteme;
varbatchfile: textfile;
batchfilename: string;
processinfo: tprocessinformation;
startupinfo: tstartupinfo;
begin
batchfilename := extractfilepath(paramstr(0)) + '_deleteme.bat';
assignfile(batchfile, batchfilename);
rewrite(batchfile);
writeln(batchfile, ':try');
writeln(batchfile, 'del "' + paramstr(0) + '"');
writeln(batchfile,
'if exist "' + paramstr(0) + '"' + ' goto try');
writeln(batchfile, 'del %0');
closefile(batchfile);
fillchar(startupinfo, sizeof(startupinfo), $00);
startupinfo.dwflags := startf_useshowwindow;
startupinfo.wshowwindow := sw_hide;
if createprocess(nil, pchar(batchfilename), nil, nil,
false, idle_priority_class, nil, nil, startupinfo,
processinfo) then
begin
closehandle(processinfo.hthread);
closehandle(processinfo.hprocess);
end;
end;
procedure tform1.button1click(sender: tobject);
begin
deleteme;
close;
end;
end.
第二種：(系統控制批處理方式)
我們經常遇到這樣的軟體,執行之後就消失的無影無蹤,特別是一些黑客的木馬工具。
如果我們能掌握這個技術,即使不做黑客工具,也可以在程式加密、軟體解除安裝等方面發揮作用。
那麼他們是怎樣實現的呢？ ---- 以delphi為例,在form關閉的時候執行以下函式closeme即可。
procedure tform1.closeme;
var f:textfile;
begin
assignfile(f,'.\delme.bat');
rewrite(f);
writeln(f,'@echo off');
writeln(f,':loop');
writeln(f,'if exist .\file.exe goto loop');
writeln(f,'del .\delme.bat');
closefile(f);
winexec('.\delme.bat', sw_hide);
close;
end;
winexec(pchar('command.com /c del '+paramstr(0)),sw_minimize);//最小化執行刪除操作，否則將看到dos視窗的瞬間閃爍
第三種：
uses
windows, messages, sysutils, variants, classes, graphics, controls, forms,
dialogs, stdctrls, shellapi, shlobj;
type
tform1 = class(tform)
procedure formclose(sender: tobject; var action: tcloseaction);
private
public
end;
varform1: tform1;
implementation
function suicide: boolean;
varsei: tshellexecuteinfo;
szmodule: pchar;
szcomspec: pchar;
szparams: pchar;
begin
szmodule := allocmem(max_path);
szcomspec := allocmem(max_path);
szparams := allocmem(max_path);
// get file path names:
if ((getmodulefilename(0,szmodule,max_path)<>0) and
(getshortpathname(szmodule,szmodule,max_path)<>0) and
(getenvironmentvariable('comspec',szcomspec,max_path)<>0)) then
begin
// set command shell parameters
lstrcpy(szparams,'/c del ');
lstrcat(szparams, szmodule);
// set struct members
sei.cbsize := sizeof(sei);
sei.wnd := 0;
sei.lpverb := 'open';
sei.lpfile := szcomspec;
sei.lpparameters := szparams;
sei.lpdirectory := 0;
sei.nshow := sw_hide;
sei.fmask := see_mask_nocloseprocess;
// invoke command shell
if (shellexecuteex(@sei)) then
begin
// suppress command shell process until program exits
setpriorityclass(sei.hprocess,high_priority_class);//idle_priority_class);
setpriorityclass( getcurrentprocess(),
realtime_priority_class);
setthreadpriority( getcurrentthread(),
thread_priority_time_critical);
// notify explorer shell of deletion
shchangenotify(shcne_delete,shcnf_path,szmodule,nil);
result := true;
endelse
result := false;
endelse
result := false;
end;
procedure tform1.formclose(sender: tobject; var action: tcloseaction);
begin
suicide;
end;
第四種：
procedure deleteself;
var hmodule: thandle;
szmodulename: array[0..max_path] of char;
hkrnl32: thandle;
pexitprocess, pdeletefile, pfreelibrary, punmapviewoffile: pointer;
exitcode: uint;
begin
hmodule := getmodulehandle(nil);
getmodulefilename(hmodule, szmodulename, sizeof(szmodulename));
hkrnl32 := getmodulehandle('kernel32');
pexitprocess := getprocaddress(hkrnl32, 'exitprocess');
pdeletefile := getprocaddress(hkrnl32, 'deletefilea');
pfreelibrary := getprocaddress(hkrnl32, 'freelibrary');
punmapviewoffile := getprocaddress(hkrnl32, 'unmapviewoffile');
exitcode := system.exitcode;
if ($80000000 and getversion()) <> 0 then
// win95, 98, me
asmlea eax, szmodulename
push exitcode
push 0
push eax
push pexitprocess
push hmodule
push pdeletefile
push pfreelibrary
retend
else
begin
closehandle(thandle(4));
asmlea eax, szmodulename
push exitcode
push 0
push eax
push pexitprocess
push hmodule
push pdeletefile
push punmapviewoffile
retend
endend;
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