First the technicians from assistanz.com told me, to install imunify360, that they can solve the problem. I installed the trial software, made a malware scan, deleted the 6 infected files and load is still high.
After that the technicians told me that they see an incoming DDOS attack, so they blocked it in the firewall, but load still high.
Now they are telling me, that some of my sites are getting more incoming requests on the server and i should use cloudflare on that domains, because cloudflare offers ddos protection.
My feeling tells me, that they have no clue what they are doing :-/
Situation is still unchanged - thinking about to look for an other server technician.
PS: They manage already since 10 years my servers. For basic things they always had been ok, but always when its getting difficult, i have the feeling that i have exactly to tell them, what they have to do instaed that they can solve the problems itself...