iPhone users across 92 countries have been alerted about potential 'mercenary spyware' attacks on their devices.
The warnings don't confirm that the devices have effectively been breached but indicate attempts to 'compromise' them.
However, Apple has been vague on the details as so to not make it easier for attackers to evade them.
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Previously, Apple’s threat notifications had been focused on 'state-sponsored attackers,' when users aware found to be targeted by hostile governments.
But these new warnings do not specifically point to state-sponsored attacks and is the first time Apple users are being warned of this type of highly-targeted attack.
When users receive the alert, they will also be notified via email and text message as well as when they log into Apple’s website.
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'Apple detected that you are being targeted by a mercenary spyware attack that is trying to remotely compromise the iPhone associated with your Apple ID -xxx-,' the ominous message reads.
'This attack is likely targeting you specifically because of who you are or what you do. Although it’s never possible to achieve absolute certainty when detecting such attacks, Apple has high confidence in this warning—please take it seriously.'
The alerts advise users to check their settings and security on their smartphones. Activating tools such as Lockdown Mode can reduce the device's exposure to potential breaches by limiting certain features.
The tech giant flagged that these attacks should be taken much more seriously than 'regular cybercriminal activity and consumer malware' as mercenary spyware attackers 'apply exceptional resources' to target only a few specific individuals.
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'Mercenary spyware attacks cost millions of dollars and often have a short shelf life, making them much harder to detect and prevent,' Apple explained.
'The vast majority of users will never be targeted by such attacks.'
Apple published a help page specific to those who received the threat notification.
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'We strongly suggest you enlist expert help, such as the rapid-response emergency security assistance provided by the Digital Security Helpline at the nonprofit Access Now,' the California-based company wrote.
'Apple threat notification recipients can contact the Digital Security Helpline 24 hours a day, seven days a week through their website.'
Additionally, as a general note of caution, Apple advises that all users should have the latest iOS updates, enable two-factor authentication and strong passwords, and never click on links or attachments from unknown senders.