Cybersecurity researchers have discovered a new campaign attributed to the Chinese “Tropic Trooper” hacking group, which employs a novel loader called Nimbda and a new variant of the Yahoyah trojan. The trojan is bundled in a greyware tool named ‘SMS Bomber,’ which is used for denial of service (DoS) attacks against phones, flooding them with messages. Tools like this are commonly used by “beginner” threat actors who want to launch attacks against sites. According to a report by Check Point, the threat actors also demonstrate in-depth cryptographic knowledge, extending the AES specification in a custom implementation. Attack chain The infection…