Query: Persistence mechanism resembling Power Settings
Matching passage: T1653 Power Settings. Tactics: persistence. Description: Adversaries may impair a system's ability to hibernate, reboot, or shut down in order to extend access to infected machines. When a computer enters a dormant state, some or all software and hardware may cease to operate which can disrupt malicious activity.(Citation: Sleep, shut down, hibernate) Adversaries may abuse system utilities and configuration settings to maintain access by preventing machines from entering a state, such as standby, that can terminate malicious activity.(Citation: Microsoft: Powercfg command-line options)(Citation: systemdsleep Linux) For example, `powercfg` controls all configurable power system settings on a Windows system and can be abused to prevent an infected host from locking or shutting down.(Citation: Two New Monero Malware Attacks Target Windows and Android Users) Adversaries may also extend system lock screen timeout settings.(Citation: BATLOADER: The Evasive Downloader Malware) Other relevant settings, such as disk and hibernate timeout, can be similarly abused to keep the infected machine running even if no user is active.(Citation: CoinLoader: A Sophisticated Malware Loader Campaign) Aware that some malware cannot survive system reboots, adversaries may entirely delete files used to invoke system shut down or reboot.(Citation: Condi-Botnet-binaries)
Near-miss passage: T1205 Traffic Signaling. Tactics: stealth, persistence, command and control. Description: 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](https://attack.mitre.org/techniques/T1205/001)), 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](https://attack.mitre.org/techniques/T1556/004) 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