Links

https://www.virustotal.com/

https://urlscan.io/

https://virusscan.jotti.org/

https://www.onlinehashcrack.com/

--- RESEARCH

https://attack.mitre.org/

https://osintframework.com/

https://www.osint.industries/

https://tools.emailhippo.com/

--- CODE

https://github.com/mandiant/flare-vm

https://github.com/kevoreilly/CAPEv2

https://github.com/gchq/CyberChef

https://github.com/mr-r3b00t

https://obf-io.deobfuscate.io/

https://app.dedaub.com/decompile

--- SANDBOXES

https://www.vmray.com/

https://any.run/

https://hybrid-analysis.com/

https://www.joesandbox.com/#windows

--- THREATINTEL

https://bazaar.abuse.ch/

https://otx.alienvault.com/

https://www.ransomware.live/

https://socradar.io/

https://intelx.io/

--- DNS

https://www.brightcloud.com/tools/url-ip-lookup.php

https://completedns.com/dns-history/

https://whoisfreaks.com/

https://securitytrails.com/domain/astrologytop.com/dns

https://dnsdumpster.com/

--- TRANING BLUETEAM

https://www.justhacking.com/

https://cyberdefenders.org/

https://letsdefend.io/

https://www.securityblue.team/

--- Frameworks

https://attack.mitre.org/

https://d3fend.mitre.org/

https://atc-project.github.io/atc-react/

https://csrc.nist.gov/pubs/sp/800/61/r3/final

--- 

https://flare.io/flare-academy/trainings/

https://challenge.bellingcat.com/

--- Samples

https://vx-underground.org/  
Password: infected 

https://bazaar.abuse.ch/browse/

https://malshare.com/