Adversaries may communicate using a protocol and port pairing that are typically not associated. For example, HTTPS over port 8088^[1] or port 587^[2] as opposed to the traditional port 443. Adversaries may make changes to the standard port used by a protocol to bypass filtering or muddle analysis/parsing of network data.

Adversaries may also make changes to victim systems to abuse non-standard ports. For example, Registry keys and other configuration settings can be used to modify protocol and port pairings.^[3]

References

1. Security Response attack Investigation Team. (2019, March 27). Elfin: Relentless Espionage Group Targets Multiple Organizations in Saudi Arabia and U.S.. Retrieved April 10, 2019.
2. Zhang, X. (2018, April 05). Analysis of New Agent Tesla Spyware Variant. Retrieved November 5, 2018.
3. The DFIR Report. (2022, March 1). "Change RDP port" #ContiLeaks. Retrieved September 12, 2024.

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