Check for .net padding oracle patch
dotnetdvaluedecode.py -d VHYaLecZ91Zjq-_4mV3ftpYrTteh9kHzk9zwLyjpAZAOjWL3nbx1SmIeGdHJwBu_koMj8ZGAqrtxCJkW0
Decoded d value: <binary output>
Length: 60
D value length of 60 is not evenly divisible by 8, your application is patched
python dotnetdvaluedecode.py -d 2nYOzoKtRvjs-g53K3r7VKmEXeQl_XMNY8nDEwcgwGVcS5Z8b9GanbNdzIgg493kfB_oI
Length: 72
D value length of 72 is evenly divisible by 8, your application is likely vulnerable (try more d values if unsure)
python ./dotnetdvaluedecode.py -e asdfasdfasdfasdf123123123234
YXNkZmFzZGZhc2RmYXNkZjEyMzEyMzEyMzIzNA==
Length: 40