CryptoPHP is the name the researchers have given to the malware that’s delivered with the compromised components, and the backdoor has a number of capabilities. It carries with it several hardcoded domains for command-and-control communications and uses RSA encryption to protect its communications with the C2 servers. Some versions also have a backup ability to communicate over email if the C2 domains are taken down. The PHPCrypto malware can update itself, inject content into the compromised sites it sits on and perform several other functions.
But the main purpose of the malware is to conduct blackhat SEO operations. The goal of these campaigns is to jack up the rank of sites controlled by the attackers, or their customers, which helps them look legitimate. This is done sometimes for gambling sites or similar sites and can also be tied to other scams.
The researchers have traced the attack to an IP address in Moldova, and the C2 servers are located in the Netherlands, Germany, Poland and the United States. Fox-IT said that they have identified thousands of plug-ins that have been backdoored, including both WordPress and Joomla plug-ins and themes and Drupal themes."