diff --git a/inc/spbc-settings.php b/inc/spbc-settings.php
index 7825b8305..631d7e2b0 100644
--- a/inc/spbc-settings.php
+++ b/inc/spbc-settings.php
@@ -2978,6 +2978,7 @@ function spbc_field_scanner()
 
     echo
         '<div id="spbc_scaner_progress_overall" class="spbc_hide" style="padding-bottom: 10px; text-align: center;">'
+        . '<span class="spbc_overall_scan_status_self_check">' . __('Self check', 'security-malware-firewall') . '</span> -> '
         . '<span class="spbc_overall_scan_status_get_cms_hashes">' . __('Receiving core hashes', 'security-malware-firewall') . '</span> -> '
         . '<span class="spbc_overall_scan_status_get_modules_hashes">' . __('Receiving plugin and theme hashes', 'security-malware-firewall') . '</span> -> '
         . '<span class="spbc_overall_scan_status_clean_results">' . __('Preparing', 'security-malware-firewall') . '</span> -> '
diff --git a/lib/CleantalkSP/SpbctWP/Scanner/ScannerQueue.php b/lib/CleantalkSP/SpbctWP/Scanner/ScannerQueue.php
index 600e046b2..40cdef815 100755
--- a/lib/CleantalkSP/SpbctWP/Scanner/ScannerQueue.php
+++ b/lib/CleantalkSP/SpbctWP/Scanner/ScannerQueue.php
@@ -31,6 +31,7 @@
 use CleantalkSP\SpbctWP\Helpers\Helper as QueueHelper;
 use CleantalkSP\SpbctWP\Helpers\CSV;
 use CleantalkSP\SpbctWP\RemoteCalls;
+use CleantalkSP\SpbctWP\Scanner\Stages\SelfCheckStage;
 use CleantalkSP\SpbctWP\Scanner\Stages\SendResultsStage;
 
 class ScannerQueue
@@ -39,6 +40,7 @@ class ScannerQueue
      * @var string[] List of scan stages
      */
     public static $stages = array(
+        'self_check',
         'get_cms_hashes',
         'get_modules_hashes',
         'clean_results',
@@ -306,6 +308,14 @@ public static function controllerFront()
         wp_send_json($out);
     }
 
+    public function self_check() // phpcs:ignore PSR1.Methods.CamelCapsMethodName.NotCamelCaps
+    {
+        $selfCheck = new SelfCheckStage();
+        $selfCheck->run();
+
+        return ['end' => true];
+    }
+
     /**
      * Receive CMS hash
      *
diff --git a/lib/CleantalkSP/SpbctWP/Scanner/Stages/SelfCheckStage.php b/lib/CleantalkSP/SpbctWP/Scanner/Stages/SelfCheckStage.php
new file mode 100644
index 000000000..f8b57a1cc
--- /dev/null
+++ b/lib/CleantalkSP/SpbctWP/Scanner/Stages/SelfCheckStage.php
@@ -0,0 +1,185 @@
+<?php
+
+namespace CleantalkSP\SpbctWP\Scanner\Stages;
+
+class SelfCheckStage
+{
+    /**
+     * @var string
+     */
+    private $url = '';
+
+    /**
+     * @var int
+     */
+    private $seal = 0;
+
+
+    /**
+     * @var string
+     */
+    private $dir = SPBC_PLUGIN_DIR;
+
+    /**
+     * Set url and seal
+     */
+    public function __construct()
+    {
+        $this->url = $this->setUrl();
+        $this->seal = $this->calculateSeal();
+    }
+
+    /**
+     * Run self check and cure
+     */
+    public function run()
+    {
+        $check = $this->check();
+
+        if (count($check) > 0) {
+            // TODO: Send to Cleantalk
+            // TODO: log
+
+            // $this->sendToCleantalk($check);
+            // $this->writeLog($check);
+            $this->cure($check);
+        }
+
+        return true;
+    }
+
+    /**
+     * Check files
+     */
+    private function check()
+    {
+        $files = $this->getFiles('check');
+
+        foreach ($files as $key) {
+            if ($key === $this->seal) {
+                unset($files[$key]);
+            }
+        }
+
+        return $files;
+    }
+
+    /**
+     * Set url
+     */
+    private function setUrl()
+    {
+        $url = 'https://plugins.svn.wordpress.org/security-malware-firewall/tags/';
+        $version = preg_replace('/[^\d.]/', '', SPBC_VERSION);
+        $url .= $version . '/';
+
+        $response = wp_remote_get($url . 'security-malware-firewall.php');
+        $code = wp_remote_retrieve_response_code($response);
+        if ($code !== 200) {
+            $url = 'https://plugins.svn.wordpress.org/security-malware-firewall/trunk/';
+        }
+
+        return $url;
+    }
+
+    /**
+     * Calculate seal
+     */
+    private function calculateSeal()
+    {
+        $files = $this->getFiles('calculate');
+
+        $frequency = array_count_values($files);
+        arsort($frequency);
+
+        reset($frequency);
+        return key($frequency);
+    }
+
+    /**
+     * Get files
+     */
+    private function getFiles($type)
+    {
+        $result = [];
+
+        $iterator = new \RecursiveIteratorIterator(
+            new \RecursiveDirectoryIterator($this->dir, \RecursiveDirectoryIterator::SKIP_DOTS),
+            \RecursiveIteratorIterator::SELF_FIRST,
+            \RecursiveIteratorIterator::CATCH_GET_CHILD
+        );
+
+        foreach ($iterator as $fileinfo) {
+            if ($fileinfo->getFilename() === '.' || $fileinfo->getFilename() === '..') {
+                continue;
+            }
+
+            if ($fileinfo->getExtension() !== 'php') {
+                continue;
+            }
+
+            if ($fileinfo->getFilename() === 'SelfCheck.php') {
+                continue;
+            }
+
+            if (strpos($fileinfo->getPathname(), $this->dir . 'vendor') !== false) {
+                continue;
+            }
+
+            if (strpos($fileinfo->getPathname(), $this->dir . 'node_modules') !== false) {
+                continue;
+            }
+
+            if (strpos($fileinfo->getPathname(), $this->dir . 'backups') !== false) {
+                continue;
+            }
+
+            if ($type === 'calculate') {
+                $result[] = $fileinfo->getMTime();
+                continue;
+            }
+
+            if ($type === 'check') {
+                $result[$fileinfo->getMTime()] = str_replace($this->dir, '', $fileinfo->getPathname());
+                continue;
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Cure
+     */
+    private function cure($check)
+    {
+        foreach ($check as $file) {
+            $response = wp_remote_get($this->url . $file);
+            $code = wp_remote_retrieve_response_code($response);
+
+            if ($code !== 200) {
+                // TODO: alient file, handle it
+                continue;
+            }
+
+            if (is_wp_error($response)) {
+                // TODO: handle error
+                continue;
+            }
+
+            $body = wp_remote_retrieve_body($response);
+            if (empty($body)) {
+                // TODO: handle error
+                continue;
+            }
+
+            $success = file_put_contents($this->dir . $file, $body);
+            if (!$success) {
+                // TODO: handle error
+                continue;
+            }
+
+            // TODO: log
+        }
+    }
+}