An anonymous reader writes: A trojan that targeted Drupal sites on Linux servers last May that was incredibly simplistic and laughable in its attempt to install (and fail) web ransomware on compromised websites, has now received a major update and has become a top threat on the malware scene. That trojan, named Rex, has evolved in only three months into an all-around threat that can: (1) compromise servers and devices running platforms like Drupal, WordPress, Magento, Jetspeed, Exarid, AirOS; (2) install cryptocurrency mining in the background; (3) send spam; (4) use a complex P2P structure to manage its botnet; and (5) install a DDoS agent which crooks use to launch DDoS attacks. Worse is that they use their DDoS capabilities to extort companies. The crooks send emails to server owners announcing them of 15-minute DDoS tests, as a forewarning of future attacks unless they pay a ransom. To scare victims, they pose as a known hacking group named Armada Collective. Other groups have used the same tactic, posing as Armada Collective, and extorting companies, according to CloudFlare.