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What does a POST like 0x%5B%5D=somename try to achieve?

Çağlar Arlı      -    3 Views

What does a POST like 0x%5B%5D=somename try to achieve?

We created a default environment on AWS Elastic Beanstalk using their Python "sample app". After some time, the logs show a large number of POST requests with bodies like this:

b'0x%5B%5D=ridho'
b'0x%5B%5D=androxgh0st'
b'0x%5B%5D=Graber'
b'0x%5B%5D=anarchy99'

These names smell pretty fishy. I guess %5B%5D encodes square brackets []?

Could someone explain what these people are trying to achieve?