New Linux Malware Downloader for Compromised Servers Spotted in the Wild

"A new Linux malware downloader created using SHC (Shell Script Compiler) has been spotted in the wild," reports the site Bleeping Computer, "infecting systems with Monero cryptocurrency miners and DDoS IRC bots... "The analysts say the attacks likely rely on brute-forcing weak administrator account credentials over SSH on Linux servers.... "According to ASEC researchers, who discovered the attack, the SHC loader was uploaded to VirusTotal by Korean users, with attacks generally focused on Linux systems in the same country.... When the SHC malware downloader is executed, it will fetch multiple other malware payloads and install them on the device. One of the payloads is an XMRig miner that is downloaded as a TAR archive from a remote URL and extracted to "/usr/local/games/" and executed.... The second payload retrieved, dropped, and loaded by the SHC malware downloader is a Perl-based DDoS IRC bot. The malware connects to the designated IRC server using configuration data and goes through a username-based verification process. If successful, the malware awaits commands from the IRC server, including DDoS-related actions such as TCP Flood, UDP Flood, and HTTP Flood, port scanning, Nmap scanning, sendmail commands, process killing, log cleaning, and more. ASEC warns that attacks like these are typically caused by using weak passwords on exposed Linux servers.

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