
My OH was recently notified by his credit card company that there was some suspicious activity on his card and that his account was suspended.
Now, my OH is super-aware of the potential for fraud as he works in the IT industry. He rarely shops online and had only made one small purchase on that card in months (£30 spent on Amazon).
When he rang the credit card company to see what was going on, they told him that somone had tried to amke a purchase for $1 and that this rang alarm bells with them. Apparently, fraudsters randomly generate card numbers and then test them by making small insignificant purchases and they had happened to hit upon OH's card no. Once they have confirmed that they've hit a winning combination, then large purches will be made. Luckily, the quick action of the issuing company meant that no additional purchases were able to be made on the card and the card was cancelled.
It's scary to think that you can do everything reasonable to safeguard yourself and STILL fall victim to fraud :(