could u pls, if there is way to find the malware or improve the security

Hi all, iam new to crypto world and my first investment is into Davor lending platform, i have bought around 11.5 dav and started lending after 2 weeks  i had a balance of 3.025 dav, then after that my account has been hacked and the balance DAV were sold and converted into BTC and transfered to a unknown BTC address, iam still confused what wrong did i do. Help needed