Hey there Ruby987!
I understand that you discovered something malicious on your iPhone. I think that it's also great that you're concerned for the safety of your device, and interested in knowing other steps you can take to strap down on the security of your iPhone, even more.
It sounds like you've already done a step most of us would agree on, by clearing your Safari History and Website Data. Kudos to you for doing that on your end.
For cases like this, I would say that clearing the History and Website Data off of Safari is all that you'd have to do. If you'd like more information on cleaning your iPhone, or rather - preventing malicious content from getting onto your iPhone here are some of my tips:
- Keep your iPhone up to date.
- Only install Apps from trusted sources, like the App Store.
- Be cautious of the websites you visit.
- Take advantage of the Find my iPhone service.
- Use a secure pass-code.
I understand that these are very simple steps, but because Apple's developed such an amazing mobile operating system there's not much really else that you do need to do to further secure your iPhone. Having some training within the IT world, we were taught the best way to prevent malware from getting onto your devices in the first place is to take these small precautionary steps as I mentioned previously, like keeping your devices up to date, and being cautious of the websites you visit.
Furthermore, Apple has even stated that "hardware and firmware features are designed to protect against malware and viruses, while iOS features help to secure your personal information." Touch ID even helps to secure unauthorized access onto your iOS devices that support Touch ID. Apple also provides it's developers with top-notch encryption, app transport security. And to summarize it all, security starts from the very basis of hardware to the App Store.
If you'd like to see where I cited that from, you can check it out here: http://www.apple.com/iphone-7/ios/. You can also find some information here: http://www.apple.com/ios/ios-10/. Though, I will note - it is tucked away down somewhere on the page - so you'll need to do a little scrolling before you find it, but it's not that tucked away.
What I also value about Apple the most as a company is their take on Privacy, and if you'd like - feel free to read up more on it here: http://www.apple.com/privacy/approach-to-privacy/.
Knowing that Apple has implemented some techniques into their devices to help protect them against malware helps me feel confident, and rest assured that my device is pretty safe, as as well their approach to protecting the Privacy of their customers.
I hope this helps to clarify and brush up on some of your concerns regarding the security of your iOS device.
Thanks for reaching out to the Apple Support Communities!
😀
