Cryptocurrency-mining malware consumes the system resources and utilizes them for mining cryptocurrencies without user permissions.
SSH service provides the secure connection for IoT (Internet of Things) refers to devices that are connected to the Internet.
Attackers using Various social Engineering tricks to compromise victims and Monero and Ethereum coins to gain huge profits using another device.
The uncovered bot mainly searches for the device that running with open Remote Desktop Protocol (RDP) port and taking advantages of of-of vulnerable devices and run the script that download & install the malware.
Botnet Infection process on SSH Service
Initially, botnet host the malicious script using specific website and the script will download the files from hxxps://www[.]yiluzhuanqian[.]com/soft/Linux/yilu_2_[.]tgz and save it into the temp folder.
This is one of the widely using exploitation technique against Linux-based servers and this bot is able to load miners on Linux.
Script downloaded site appears to be financial scam site and the attacker using sophisticated techniques that helps switch to another domain to continue operations if the link is blocked at any cost.
So once the downloaded malicious script will be executed then it first checks the internet connectivity the connect to Baindu.com after that, it checks the OS that running on the target and it specifically targets the Linux based operating system.
The hugepage and memlock are also set up helps to enhance the more computational power to mining the cryptocurrency.
Once those are set up, the script downloads the miner, disguised as a download of a libhwloc4library and this miner using some persistance mechanism to keep running the miner even after rebooting the computer.
According to Trend Micro report, The file cmd.txt lists commands used to run the “mservice” binary with parameters, which then installs the actual miner, “YiluzhuanqianSer.” (Note that the miner is related to the potential scam site domain.Apart from this a conf.json file contains e web shell/backdoor and the aditional directories includes two binaries and even a cmd.txt file that contains commands used to run the miner.
This type of mining operation that targets connected devices for profit is not the first of its kind. Moreover, security incidents that make use of bots to target IoT devices have made headlines on several occasions Trend Micro said.