Traffic Signaling: Простукивание портов
Other sub-techniques of Traffic Signaling (2)
ID | Название |
---|---|
.001 | Простукивание портов |
.002 | Фильтры сокета |
Adversaries may use port knocking to hide open ports used for persistence or command and control. To enable a port, an adversary sends a series of attempted connections to a predefined sequence of closed ports. After the sequence is completed, opening a port is often accomplished by the host based firewall, but could also be implemented by custom software. This technique has been observed both for the dynamic opening of a listening port as well as the initiating of a connection to a listening server on a different system. The observation of the signal packets to trigger the communication can be conducted through different methods. One means, originally implemented by Cd00r (Citation: Hartrell cd00r 2002), is to use the libpcap libraries to sniff for the packets in question. Another method leverages raw sockets, which enables the malware to use ports that are already open for use by other programs.
Примеры процедур |
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Название | Описание |
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PROMETHIUM |
PROMETHIUM has used a script that configures the knockd service and firewall to only accept C2 connections from systems that use a specified sequence of knock ports.(Citation: Bitdefender StrongPity June 2020) |
Контрмеры |
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Контрмера | Описание |
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Filter Network Traffic |
Use network appliances to filter ingress or egress traffic and perform protocol-based filtering. Configure software on endpoints to filter network traffic. |
Обнаружение
Record network packets sent to and from the system, looking for extraneous packets that do not belong to established flows.
Связанные риски
Каталоги
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