Analysis by: Henry Alarcon Jr.
ALIASES:

ELF:SSHDoor-ED [Trj] (Avast), HEUR:Backdoor.Linux.Ssh.a (Kaspersky)

 PLATFORM:

Linux

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE:

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

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.

  TECHNICAL DETAILS

File Size: 2,600,492 bytes
File Type: ELF
Memory Resident: No
Initial Samples Received Date: 28 May 2019
Payload: Connects to URLs/IPs

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.

Backdoor Routine

This Backdoor executes the following commands from a remote malicious user:

  • SSH bruteforce attack on vulnerable hosts running an SSH service.

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}.{BLOCKED}.86.129:3333

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.138.06
FIRST VSAPI PATTERN DATE: 28 May 2019
VSAPI OPR PATTERN File: 15.139.00
VSAPI OPR PATTERN Date: 29 May 2019

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Linux.SSHDOOR.AB. 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 the following Trend Micro Support pages for more information:


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