This morning, I received this eMail. Originally I thought it was a scam, but looks like it might be true. Here is the eMail (with redacted specifics)
Hello Casey,
Your cloud server that is hosting: [URL] and [URL] has been compromised on 2022-05-28 at 21:58, server time. I am not the threat actor, i stumbled across your server in a Shodan search.
Your server with IP [IP Address] and [URL] has directory listing enabled and you can see a webshell present there, wso.php, This probably happened because your server shares the webroot with rsync without authentication, someone used this to upload the webshell.
___________________________________________________________________________The webshell has a default password of ghost287, is ran with the permissions of the www-data user so it's not possible to do heavy damage without escalating privileges but i highly encourage you to remove it to prevent further problems for your server.Please answer if you need help to remove the webshell.Kind regards
The file wso.php was present in /var/www along with another text file that looked like it had a password in it. I've deleted those files. But I'm wondering what my next course of action should be?
Should I completely shutdown and rebuild the servers (not too hard, I've got copies of the important files)?
Should I ask the author of this eMail for help as he offered?
Should I delete the 2 files and forget about it?
Obviously, I will be changing passwords, but could a bad person already have penetrated enough to see me change them and get the new passwords also?
Any advice would be appreciated.
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