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SECURITM это SGRC система, автоматизирующая процессы в службах информационной безопасности. SECURITM помогает построить и управлять ИСПДн, КИИ, ГИС, СМИБ/СУИБ, банковскими системами защиты.
А еще SECURITM это место для обмена опытом и наработками для служб безопасности.

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Traffic Signaling

Sub-techniques (2)

ID	Name
.001	Port Knocking
.002	Socket Filters

Adversaries may use traffic signaling to hide open ports or other malicious functionality used for persistence or command and control. Traffic signaling involves the use of a magic value or sequence that must be sent to a system to trigger a special response, such as opening a closed port or executing a malicious task. This may take the form of sending a series of packets with certain characteristics before a port will be opened that the adversary can use for command and control. Usually this series of packets consists of attempted connections to a predefined sequence of closed ports (i.e. Port Knocking), but can involve unusual flags, specific strings, or other unique characteristics. After the sequence is completed, opening a port may be accomplished by the host-based firewall, but could also be implemented by custom software. Adversaries may also communicate with an already open port, but the service listening on that port will only respond to commands or trigger other malicious functionality if passed the appropriate magic value(s). 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. On network devices, adversaries may use crafted packets to enable Network Device Authentication for standard services offered by the device such as telnet. Such signaling may also be used to open a closed service port such as telnet, or to trigger module modification of malware implants on the device, adding, removing, or changing malicious capabilities. Adversaries may use crafted packets to attempt to connect to one or more (open or closed) ports, but may also attempt to connect to a router interface, broadcast, and network address IP on the same port in order to achieve their goals and objectives.(Citation: Cisco Synful Knock Evolution)(Citation: Mandiant - Synful Knock)(Citation: Cisco Blog Legacy Device Attacks) To enable this traffic signaling on embedded devices, adversaries must first achieve and leverage Patch System Image due to the monolithic nature of the architecture. Adversaries may also use the Wake-on-LAN feature to turn on powered off systems. Wake-on-LAN is a hardware feature that allows a powered down system to be powered on, or woken up, by sending a magic packet to it. Once the system is powered on, it may become a target for lateral movement.(Citation: Bleeping Computer - Ryuk WoL)(Citation: AMD Magic Packet)

ID: T1205

Sub-techniques: .001 .002

Tactic(s): Command and Control, Defense Evasion, Persistence

Platforms: Linux, macOS, Network, Windows

Data Sources: Network Traffic: Network Connection Creation, Network Traffic: Network Traffic Content, Network Traffic: Network Traffic Flow, Process: Process Creation

Version: 2.4

Created: 18 Apr 2018

Last Modified: 19 Oct 2022

Name	Description
Procedure Examples
	During Cutting Edge, threat actors sent a magic 48-byte sequence to enable the PITSOCK backdoor to communicate via the `/tmp/clientsDownload.sock` socket.(Citation: Mandiant Cutting Edge Part 3 February 2024)
ZIPLINE	ZIPLINE can identify a specific string in intercepted network traffic, `SSH-2.0-OpenSSH_0.3xx.`, to trigger its command functionality.(Citation: Mandiant Cutting Edge January 2024)
BUSHWALK	BUSHWALK can modify the `DSUserAgentCap.pm` Perl module on Ivanti Connect Secure VPNs and either activate or deactivate depending on the value of the user agent in incoming HTTP requests.(Citation: Mandiant Cutting Edge Part 3 February 2024)
Penquin	Penquin will connect to C2 only after sniffing a "magic packet" value in TCP or UDP packets matching specific conditions.(Citation: Leonardo Turla Penquin May 2020)(Citation: Kaspersky Turla Penquin December 2014)
SYNful Knock	SYNful Knock can be sent instructions via special packets to change its functionality. Code for new functionality can be included in these messages.(Citation: Mandiant - Synful Knock)
Winnti for Linux	Winnti for Linux has used a passive listener, capable of identifying a specific magic value before executing tasking, as a secondary command and control (C2) mechanism.(Citation: Chronicle Winnti for Linux May 2019)
Chaos	Chaos provides a reverse shell is triggered upon receipt of a packet with a special string, sent to any port.(Citation: Chaos Stolen Backdoor)
Umbreon	Umbreon provides additional access using its backdoor Espeon, providing a reverse shell upon receipt of a special packet.(Citation: Umbreon Trend Micro)
Kobalos	Kobalos is triggered by an incoming TCP connection to a legitimate service from a specific source port.(Citation: ESET Kobalos Feb 2021)(Citation: ESET Kobalos Jan 2021)
Pandora	Pandora can identify if incoming HTTP traffic contains a token and if so it will intercept the traffic and process the received command.(Citation: Trend Micro Iron Tiger April 2021)
Ryuk	Ryuk has used Wake-on-Lan to power on turned off systems for lateral movement.(Citation: Bleeping Computer - Ryuk WoL)
Uroburos	Uroburos can intercept the first client to server packet in the 3-way TCP handshake to determine if the packet contains the correct unique value for a specific Uroburos implant. If the value does not match, the packet and the rest of the TCP session are passed to the legitimate listening application.(Citation: Joint Cybersecurity Advisory AA23-129A Snake Malware May 2023)

Mitigation	Description
Mitigations
Port Knocking Mitigation	Mitigation of some variants of this technique could be achieved through the use of stateful firewalls, depending upon how it is implemented.
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.
Disable or Remove Feature or Program	Remove or deny access to unnecessary and potentially vulnerable software to prevent abuse by adversaries.

Detection

Record network packets sent to and from the system, looking for extraneous packets that do not belong to established flows. The Wake-on-LAN magic packet consists of 6 bytes of FF followed by sixteen repetitions of the target system's IEEE address. Seeing this string anywhere in a packet's payload may be indicative of a Wake-on-LAN attempt.(Citation: GitLab WakeOnLAN)

References

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