you probably hear for this

[biodegradable]

i type virus tets on youtube to see how people test AV or antimalware,and i find this site Virussign.com,they got really alot of diferent malwares for testing AV,you can add also they all on blacklist in emsisoft anti malware,they have new list every day,i hope this is helpfull

[Elise]

Thank you, we are aware of this resource and check their samples on a regular basis.