Findings of the MIMICS project conducted by Dragos Threat Operations Center show a malware posing as Siemens PLC application is targeting ICS worldwide. The most dangerous threats are malware that quickly spread like Sivis, Ramnit, and Virut. Only three publicly showcased pieces of ICS tailored malware: Stuxnet, Havex, and BlackEnergy2. The last time this specific ICS malware was discovered was early March. The malware is simply crimeware but has seemingly been effective.”]
Source: https://securityaffairs.co/wordpress/57412/malware/siemens-plc-ics-malware.html