You enter the URL of an online store that you regularly visit. You browse the site and make a purchase using your credit card. Your purchase is declined due to some error. After some time, you get an alert from your credit card company about a transaction on your credit card. Which attack were you a victim of?
1) Phishing attack
2) Malware attack
3) Man-in-the-middle attack
4) Denial-of-service attack