Как обнаружить спам-бота в своей сети

Не будем говорить о том, что надо ограничивать права, блокировать трафик и применять прочие методы для того чтобы в вашей сети не заводились спам-боты. Так как все равно каждый день появляются уязвимости, а с ними и новые вирусы.

Но вначале я бы хотел обратить ваше внимание на такой замечательный ресурс как http://mxtoolbox.com/blacklists.aspx, который периодически будет производить проверку вашего IP на наличие в black list. И в случае, если ваш IP будет замечен,- пришлет “тревожное письмо”.

После этого возникнет вопрос какая машина заражена. Определить это очень просто. Просто приведу пример работы утилиты, которая должна быть на вооружении у каждого уважающего себя админа, а именно tcpdump. Естественно запускать tpcdump нужно на вашем шлюзе под управлением Linux

tcpdump -ni eth1 'tcp[tcpflags] & tcp-syn != 0 and dst port 25'

В моем примере eth1 – это интерфейс, который смотрит в локальную сеть.

Для шлюзов на основе Windows есть отличная тулза  Wireshark

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