The security breach that impacted 70 million Target customers last month may have been caused by malware created by a 17-year-old Russian hacker. The news comes courtesy multi-tier intelligence aggregator IntelCrawler, which reports that the malware used during the Target breach may have also been a part of a similar attack on retailer Neiman Marcus. Most of the victims are department stores. More BlackPOS infections, as well as new breaches can appear very soon, retailers and security community should be prepared for them. According to the company, the very first sample of the malware was created last March, and the first infected point-of-sales systems were in the United States, Australia, and Canada.