The threat group APT33 is known to target the oil and aviation industries aggressively. Our recent findings show that the group uses about a dozen live Command and Control (C&C) servers for extremely narrow targeted malware campaigns against organizations in the Middle East, the U.S., and Asia.
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We found a new modular fileless botnet malware, which we named “Novter,” (also reported and known as “Nodersok” and “Divergent”) that the KovCoreG campaign has been distributing since March. We’ve been actively monitoring this threat since its emergence and early development, and saw it being frequently updated. KovCoreG, active since 2011, is a long-running campaign known for using the Kovter botnet malware, which was distributed mainly through malvertisements and exploit kits. Kovter has been involved in click fraud operations since 2015, using fraudulent ads that have reportedly cost businesses more than US$29 million. The botnet was taken down at the end of 2018 through concerted efforts by law enforcement and cybersecurity experts, including Trend Micro.
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When we first investigated MyKings in 2017, we focused on how the cryptominer-dropping botnet malware used WMI for persistence. Like Mirai, MyKings seems to be constantly undergoing changes to its infection routine. The variant we analyzed for this incident did not just have a single method of retaining persistence but multiple ones, as discussed in the previous section. In addition to WMI, it also used the registry, the task scheduler, and a bootkit — the most interesting of which is the bootkit.
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Miori has recently reappeared bearing a notable difference in the way it communicates with its C&C server. This Miori variant departs from the usual binary-based protocol and uses a text-based protocol to communicate with its C&C.
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We observed a new cryptocurrency-mining botnet that arrives via open ADB (Android Debug Bridge) ports and can spread via SSH. This attack takes advantage of the way open ADB ports don’t have authentication by default, similar to the Satori botnet variant we previously reported. This malware’s design allows it to spread from the infected host to any system that has had a previous SSH connection with the host.
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