Adversaries may leverage remote services to move between assets and network segments. These services are often used to allow operators to interact with systems remotely within the network, some examples are RDP, SMB, SSH, and other similar mechanisms.^[1],[2],[3]

Remote services could be used to support remote access, data transmission, authentication, name resolution, and other remote functions. Further, remote services may be necessary to allow operators and administrators to configure systems within the network from their engineering or management workstations. An adversary may use this technique to access devices which may be dual-homed^[1] to multiple network segments, and can be used for Program Download or to execute attacks on control devices directly through Valid Accounts.

Specific remote services (RDP & VNC) may be a precursor to enable Graphical User Interface execution on devices such as HMIs or engineering workstation software.

Based on incident data, CISA and FBI assessed that Chinese state-sponsored actors also compromised various authorized remote access channels, including systems designed to transfer data and/or allow access between corporate and ICS networks.^[4]

References

1. Blake Johnson, Dan Caban, Marina Krotofil, Dan Scali, Nathan Brubaker, Christopher Glyer 2017, December 14 Attackers Deploy New ICS Attack Framework TRITON and Cause Operational Disruption to Critical Infrastructure Retrieved. 2018/01/12
2. Dragos 2017, December 13 TRISIS Malware Analysis of Safety System Targeted Malware Retrieved. 2018/01/12
3. Joe Slowik 2019, April 10 Implications of IT Ransomware for ICS Environments Retrieved. 2019/10/27
4. Department of Justice (DOJ), DHS Cybersecurity & Infrastructure Security Agency (CISA) 2021, July 20 Chinese Gas Pipeline Intrusion Campaign, 2011 to 2013 Retrieved. 2021/10/08

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