Security researcher Willem de Groot published a few days ago a list of many thousend stores worldwide using a technique to skim customers credit cards.
After that, GitHub deleted this list, GitLab also, but republished it later again.
Interesting that many infected shops are build with Magento.
The article: https://gwillem.gitlab.io/2016/10/11/59 ... -skimming/
The list: https://gitlab.com/gwillem/public-snipp ... pets/28813