Over 4,000 insecure Elasticsearch servers have been hosting the point-of-sale malware Alina and JackPoS.

A strain of point-of-sale malware that began making the rounds on underground markets late last month is easy to use, but less sophisticated than initial reports suggested. According to researchers at Talos, Cisco’s research division, Pro PoS is mostly built on Alina, another type of POS malware which had its source code leaked earlier this...