Security-update-required.com is a deceptive website that tries to trick iPhone users into installing various Potentially Unwanted Programs (PUPs). Although the main focus is on iPhones, other Apple devices could be affected by the scheme as well. Usually, users do not land on sites such as Securty-update-required.com willingly and are taken there through redirects from either intrusive Web advertisements or the presence of an adware application on their devices.
As for the particular tactic carried out by Security-update-required.com, it can vary between several options. In some instances, the website will pretend that the device of the user is infected with malware. The pop-up message generated by the site states:
Apple device is infected with viruses
picked up while surfing recent
corrupted sites. Tap Ok to follow
the instructions to protect your
The tactic then urges users to install a 'mobile security application.' It should be noted that no Web page can scan your device for malware and messages such as this are false completely and utterly. As is the message shown in the other scheme carried out by Security-update-required.com, which claims that users have either to update their existing VPN or install a new one.
In both cases, it is recommended for users to scan their devices with a reputable anti-malware solution for any adware that could be causing the redirects to Security-update-required.com.