Linux/Agent.AL (ESET)
Linux, UNIX
This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
It executes commands from a remote malicious user, effectively compromising the affected system.
Arrival Details
This backdoor arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.
This malware arrives via the following means:
Backdoor Routine
This backdoor executes the following commands from a remote malicious user:
It connects to the following URL(s) to send and receive commands from a remote malicious user:
NOTES:
If the command SCANNER ON is received, the Telnet forked process will attempt to connect to port 23 of randomly generated IP address to check it can remotely login using Telnet. Once a connection is successful, it attempts to log into the remote computer using the following credentials:
User names:
Passwords:
If it was able to successfully log into the system, it sends the following commands to download and execute a file in the remote computer:
Restart in normal mode and scan your computer with your Trend Micro product for files detected as ELF_BASHLITE.SMB. If the detected files have already been cleaned, deleted, or quarantined by your Trend Micro product, no further step is required. You may opt to simply delete the quarantined files. Please check this Knowledge Base page for more information.