Adversaries may attempt to blend in with legitimate traffic by spoofing browser and system attributes like operating system, system language, platform, user-agent string, resolution, time zone, etc. The HTTP User-Agent request header is a string that lets servers and network peers identify the application, operating system, vendor, and/or version of the requesting user agent.^[1]

Adversaries may gather this information through System Information Discovery or by users navigating to adversary-controlled websites, and then use that information to craft their web traffic to evade defenses.^[2]

References

1. MDN contributors. (2025, July 4). User-Agent header. Retrieved October 19, 2025.
2. Zengrui Liu, Prakash Shrestha, and Nitesh Saxena. (2021, October 19). Retrieved April 15, 2026.

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