Remote Access Tools
An adversary may use legitimate desktop support and remote access software, such as Team Viewer, Go2Assist, LogMein, AmmyyAdmin, etc, to establish an interactive command and control channel to target systems within networks. These services are commonly used as legitimate technical support software, and may be whitelisted within a target environment. Remote access tools like VNC, Ammy, and Teamviewer are used frequently when compared with other legitimate software commonly used by adversaries. 
Remote access tools may be established and used post-compromise as alternate communications channel for Redundant Access or as a way to establish an interactive remote desktop session with the target system. They may also be used as a component of malware to establish a reverse connection or back-connect to a service or adversary controlled system.
|Carbanak||Carbanak has a plugin for VNC and Ammyy Admin Tool. |
|Carbanak||Carbanak used legitimate programs such as AmmyAdmin and Team Viewer for remote interactive C2 to target systems. |
|Cobalt Group||Cobalt Group used the Ammyy Admin tool as well as TeamViewer for remote access.   |
|Dridex||Dridex contains a module for VNC. |
|Kimsuky||Kimsuky has used a modified TeamViewer client as a command and control channel. |
|Night Dragon||Night Dragon has used several remote administration tools as persistent infiltration channels. |
|Thrip||Thrip used a cloud-based remote access software called LogMeIn for their attacks. |
|Execution Prevention||Use application whitelisting to mitigate installation and use of unapproved software that can be used for remote access.|
|Filter Network Traffic||Properly configure firewalls, application firewalls, and proxies to limit outgoing traffic to sites and services used by remote access tools.|
|Network Intrusion Prevention||Network intrusion detection and prevention systems that use network signatures may be able to prevent traffic to remote access services.|
Monitor for applications and processes related to remote admin tools. Correlate activity with other suspicious behavior that may reduce false positives if these tools are used by legitimate users and administrators.
Analyze network data for uncommon data flows (e.g., a client sending significantly more data than it receives from a server). Processes utilizing the network that do not normally have network communication or have never been seen before are suspicious. Analyze packet contents to detect application layer protocols that do not follow the expected protocol for the port that is being used.
Domain Fronting may be used in conjunction to avoid defenses. Adversaries will likely need to deploy and/or install these remote tools to compromised systems. It may be possible to detect or prevent the installation of these tools with host-based solutions.
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