Ответ МикротикаThe Wired article includes our comment and is pretty accurate. As far as we know, somebody exploited the already fixed chimayred vulnerability in open (no firewall) routers before we patched it in March 2017 (RouterOS v6.38.5). Upgrading RouterOS fixes the vulnerability and removes any malicious files.
Also worth noting, that Winbox no longer downloads any DLL files from your device anyway, since even before the above mentioned version.
На текущий момент последняя версия 6.41.3.