Куда я попал?

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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Передача управляющих сигналов в трафике

Sub-techniques (2)

ID	Name
.001	Простукивание портов
.002	Фильтры сокета

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

Суб-техники: .001 .002

Тактика(-и): Command and Control, Defense Evasion, Persistence

Платформы: Linux, macOS, Network Devices, Windows

Источники данных: Network Traffic: Network Connection Creation, Network Traffic: Network Traffic Content, Network Traffic: Network Traffic Flow, Process: Process Creation

Версия: 2.5

Дата создания: 18 Apr 2018

Последнее изменение: 15 Apr 2025

Название	Описание
Примеры процедур
	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)
J-magic	J-magic can monitor TCP traffic for packets containing one of five different predefined parameters and will spawn a reverse shell if one of the parameters and the proper response string to a subsequent challenge is received.(Citation: Lumen J-Magic JAN 2025)
TRANSLATEXT	TRANSLATEXT has redirected clients to legitimate Gmail, Naver or Kakao pages if the clients connect with no parameters.(Citation: Zscaler Kimsuky TRANSLATEXT)
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)
Kimsuky	Kimsuky has used TRANSLATEXT to redirect clients to legitimate Gmail, Naver or Kakao pages if the clients connect with no parameters.(Citation: Zscaler Kimsuky TRANSLATEXT)

Контрмера	Описание
Контрмеры
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	Employ network appliances and endpoint software to filter ingress, egress, and lateral network traffic. This includes protocol-based filtering, enforcing firewall rules, and blocking or restricting traffic based on predefined conditions to limit adversary movement and data exfiltration. This mitigation can be implemented through the following measures: Ingress Traffic Filtering: - Use Case: Configure network firewalls to allow traffic only from authorized IP addresses to public-facing servers. - Implementation: Limit SSH (port 22) and RDP (port 3389) traffic to specific IP ranges. Egress Traffic Filtering: - Use Case: Use firewalls or endpoint security software to block unauthorized outbound traffic to prevent data exfiltration and command-and-control (C2) communications. - Implementation: Block outbound traffic to known malicious IPs or regions where communication is unexpected. Protocol-Based Filtering: - Use Case: Restrict the use of specific protocols that are commonly abused by adversaries, such as SMB, RPC, or Telnet, based on business needs. - Implementation: Disable SMBv1 on endpoints to prevent exploits like EternalBlue. Network Segmentation: - Use Case: Create network segments for critical systems and restrict communication between segments unless explicitly authorized. - Implementation: Implement VLANs to isolate IoT devices or guest networks from core business systems. Application Layer Filtering: - Use Case: Use proxy servers or Web Application Firewalls (WAFs) to inspect and block malicious HTTP/S traffic. - Implementation: Configure a WAF to block SQL injection attempts or other web application exploitation techniques.
Disable or Remove Feature or Program	Disable or remove unnecessary and potentially vulnerable software, features, or services to reduce the attack surface and prevent abuse by adversaries. This involves identifying software or features that are no longer needed or that could be exploited and ensuring they are either removed or properly disabled. This mitigation can be implemented through the following measures: Remove Legacy Software: - Use Case: Disable or remove older versions of software that no longer receive updates or security patches (e.g., legacy Java, Adobe Flash). - Implementation: A company removes Flash Player from all employee systems after it has reached its end-of-life date. Disable Unused Features: - Use Case: Turn off unnecessary operating system features like SMBv1, Telnet, or RDP if they are not required. - Implementation: Disable SMBv1 in a Windows environment to mitigate vulnerabilities like EternalBlue. Control Applications Installed by Users: - Use Case: Prevent users from installing unauthorized software via group policies or other management tools. - Implementation: Block user installations of unauthorized file-sharing applications (e.g., BitTorrent clients) in an enterprise environment. Remove Unnecessary Services: - Use Case: Identify and disable unnecessary default services running on endpoints, servers, or network devices. - Implementation: Disable unused administrative shares (e.g., C$, ADMIN$) on workstations. Restrict Add-ons and Plugins: - Use Case: Remove or disable browser plugins and add-ons that are not needed for business purposes. - Implementation: Disable Java and ActiveX plugins in web browsers to prevent drive-by attacks.

Обнаружение

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)

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