Security researchers at Kaspersky say they have identified a malicious backdoor planted in the popular and long-running Windows disc imaging software, Daemon Tools.  The Russian cybersecurity company said on Tuesday that data collected from computers around the world running the Kaspersky antivirus software shows a “widespread” attack is under way, targeting thousands of Windows computers running Daemon Tools. The hackers, whom Kaspersky has linked to a Chinese-language speaking group based on an analysis of the malware, used the backdoor in Daemon Tools to plant additional malware on a dozen computers across the retail, scientific and manufacturing sectors, as well as government systems. Kaspersky said the hacking of these specific computers implied a “targeted” effort.  The company said the targeted organizations are located in Russia, Belarus and Thailand. Kaspersky said the backdoor was first detected on April 8.…