Security issue

Hey, I got this message today from my host. I took out sensitive info because I can’t post private messages here. Here is the message below:

We have recently scanned one or more users on your DreamHost account for potential security threats. Unfortunately, we found some potential indications that your website(s) *may* be compromised.

We understand that this may not be the best news you can get. This notification is intended to help you through the process and serve as a starting point to assist you in getting your account cleaned and secured. While we won’t be able to complete these processes for you, if you have any questions about the items that follow please don’t hesitate to reply to this email and we will be happy to clarify any points or offer any further guidance to help you through getting your account back to normal.

The following files/directories had insecure permissions (777), which have been remediated.

/home/**_******/*********.com/wp-content/booster_cache

Additionally, the following steps should be taken to ensure password
security:

Change your users’ password(s) by clicking under the “Action” column for that user in our Web Panel: https://panel.dreamhost.com/index.cgi?tree=users.users
Change your database password(s) by clicking the database username in our Web Panel: https://panel.dreamhost.com/index.cgi?tree=goodies.mysql
IMPORTANT: You may need to modify your site’s configuration file to reflect the new password.

Use a complex (8-31 characters) password or passphrase that contains mixed case letters, numbers, and symbols. You should avoid using dictionary words (in any language), names, dates, addresses, phone numbers, etc. as these can potentially be guessed or acquired through other sources. The username that the password is being used for, or the domain name/site name the user is attached to should never be included in any part of the password. Also note that it is a good idea to periodically change your passwords.
If you have any questions, please reply to this email and we will be more than happy to assist you with securing your sites.

For general tips on keeping your site secure, please also see Keeping your website secure.

If you have any questions or concerns, you can submit a ticket, open a LiveChat, or request phone support here!

Sincerely,

DreamHost Security Bot