The excellent Cyberchef from GCHQ Should need no introduction. Can also be downloaded from their github and deployed locally/offline if you are understandably reluctant to paste things into a tool run by an (in no way sinister) intelligence agency.

https://gchq.github.io/CyberChef/

A handy convertor for CUrl

https://curlconverter.com/

When benign binaries try to convince you that they are malicious. The explanation for your weird false positive.

https://wtfbins.wtf/

A collection of one-liners, small scripts, and some useful tips for blue team work.

https://github.com/Purp1eW0lf/Blue-Team-Notes