A virus in my iPhone can read my banking app?

y1y2 Said:

"Hi, I just opened an email that was saying there was a class action a company with or against Apple and to respond ......but suddenly the email disappeared and couldn’t find it........so I get worried.......I just read it only"

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It's a scam. Being that Apple is reportedly involved, forward it to Apple at reportphishing@apple.com. Did you reply? If not, then you are all set from here. Then, delete the eMail, and remove it from your Trash and Archive folders. If you did reply, then...

Modify your Credentials:

If you are concerned about you account information being compromised, then by all means modify your credentials. You are able to log into these forums just fine. So, log into iCloud, and modify your credentials, starting with a new, strong password and using a new eMail address (for Apple).

• Modify: your login credentials (Using Both a New eMail and a New Passwordfor each and all sites)
• Associate: a different method of payment to your account
• Enable: Two-Factor Authentication for Apple ID and for all other accounts that have such an applicable option

y1y2 Said:

"Hi TheLittles, No I did not respond to that email......I just read it and just alone it disappeared[...]"

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Managing Passwords:

With unexpected changes, someone may have you password, through a full-assumption, on my part. So, change your eMail account's password. Also, ask your eMail provider if they offer the service of an App Password. For example, here is how App Passwords are used for Gmail: Sign in using app passwords - Gmail Help

A non-jailbroken phone cannot be hacked or get a virus. Why do you think you might have one?