Adversaries may encode data with a non-standard data encoding system to make the content of command and control traffic more difficult to detect. Command and control (C2) information can be encoded using a non-standard data encoding system that diverges from existing protocol specifications. Non-standard data encoding schemes may be based on or related to standard data encoding schemes, such as a modified Base64 encoding for the message body of an HTTP request.^[1],[2]

References

1. Wikipedia. (2016, December 26). Binary-to-text encoding. Retrieved March 1, 2017.
2. Wikipedia. (2017, February 19). Character Encoding. Retrieved March 1, 2017.

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