CheckUserLoginBackendObserver.php

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<?php
namespace Magento\Captcha\Observer;

use Magento\Framework\Event\ObserverInterface;
use Magento\Framework\Exception\Plugin\AuthenticationException as PluginAuthenticationException;

class CheckUserLoginBackendObserver implements ObserverInterface
{
    protected $_helper;

    protected $captchaStringResolver;

    protected $_request;

    public function __construct(
        \Magento\Captcha\Helper\Data $helper,
        CaptchaStringResolver $captchaStringResolver,
        \Magento\Framework\App\RequestInterface $request
    ) {
        $this->_helper = $helper;
        $this->captchaStringResolver = $captchaStringResolver;
        $this->_request = $request;
    }

    public function execute(\Magento\Framework\Event\Observer $observer)
    {
        $formId = 'backend_login';
        $captchaModel = $this->_helper->getCaptcha($formId);
        $login = $observer->getEvent()->getUsername();
        if ($captchaModel->isRequired($login)
            && !$captchaModel->isCorrect($this->captchaStringResolver->resolve($this->_request, $formId))
        ) {
            $captchaModel->logAttempt($login);
            throw new PluginAuthenticationException(__('Incorrect CAPTCHA.'));
        }
        $captchaModel->logAttempt($login);

        return $this;
    }
}