Malware - popup ads

[digif]

Hi,

Recently I've noticed that when I click on the website, popup comes up, even though I never added such ads on the forum.

URL: beneamata.com

How can I find where the code was added and through where did they manage to do that?

Thanks in advance

--------------- Added [DATE]1593120925[/DATE] at [TIME]1593120925[/TIME] ---------------

Ive upgraded version from 3.8.4 to 3.8.9, now there are no more popups, but I wanted to upgrade it to 3.8.11, it got stuck on 3.8.9 with the error:

Database error in vBulletin 3.8.9:
Invalid SQL:
ALTER TABLE adminlog CHANGE ipaddress ipaddress VARCHAR(45) NOT NULL DEFAULT '';
MySQL Error : Table 'elebocom_beneamata.adminlog' doesn't exist
Error Number : 1146
IP Address : IPADDRESS
Username :

Any ideas why?

--------------- Added [DATE]1593125969[/DATE] at [TIME]1593125969[/TIME] ---------------

Ive created the table, everything is now fixed, I've upgraded to 3.8.11, no more malware popups. Thread can go on lock.