Digging into the concept of asymmetric cyber warfare and looking for current examples I got to the following white papers which provide an explanation and describe the asymmetric warfare concept. It is also discussed one the most sounded cases of asymmetric cyber warfare known until today, the Jester case.

https://ccdcoe.org/sites/default/files/multimedia/pdf/3_2_LilesDietzRogersLarson_ApplyingTraditionalMilitaryPrinciplesToCyberWarfare.pdf

https://www.sans.org/reading-room/whitepapers/attacking/jester-dynamic-lesson-asymmetric-unmanaged-cyber-warfare-33889