Therefore, Apple users who have already been tricked by the phishing scam are asked to change their passwords and check their accounts thoroughly for any discrepancies. And, for those whose accounts have already been hijacked, are asked to contact Apple for help.
A Sample of the "Your Apple ID Tried to Sign into iCloud from another Device" Phishing Scam
From: Apple <Apple@additional-verified.info>
To: rtone4 <firstname.lastname@example.org>
Sent: Sat, Oct 7, 2017 11:24 am
Subject: Your Apple ID tried to sign into iCloud from another device Case-ID : 26622
Your Apple ID has been sign from uknown device, someone tried to log in to your iCloud from a web browser
Date and time : 07 October, 2017 at 22:26 PM UTC +07:00
Location : Bangkok, Thailand
Browser : Safari Browser
Operating system : Mac OS X
If you have not signed in to your iCloud recently and someone may have accessed your account, go to your Apple ID to protect any suspicious activity.
Protect My Apple ID
Copyright © 2017 Apple Inc Infinite Loop, Cupertino, CA 95014 USA. All Rights Reserved
Apple users should never click on a link, especially in email messages, to sign into their accounts. If they have received similar email messages like the one above, they should always go directly to https://appleid.apple.com/ and sign into their accounts from there. If there is something wrong with their accounts or they need to do something to their accounts, they will be notified after signing in.