Analysis by: Patrick Angelo Roderno
ALIASES:

Linux/CoinMiner.KP (ESET-NOD32); Linux.Watchbog (SYMANTEC); Mal/Generic-S (SOPHOS)

 PLATFORM:

Linux

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

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 runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk. It connects to a website to send and receive information. However, as of this writing, the said sites are inaccessible.

As of this writing, the said sites are inaccessible.

It takes advantage of certain vulnerabilities.

  TECHNICAL DETAILS

File Size: 604,320 bytes
File Type: ELF
Memory Resident: No
Initial Samples Received Date: 22 Jul 2019
Payload: Connects to URLs/IPs, Downloads files, Steals information, Exploits vulnerabilities

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 command(s) from a remote malicious user:

  • Terminates itself
  • Propagates using specific exploits
  • Scans for vulnerable targets, specifically the following services/servers:
    • Redis
    • CouchDB
    • Exim
    • Jenkins
    • Nexus
    • Jira
  • Perform brute force attack on the following services/servers:
    • Redis
    • CouchDB

It connects to the following websites to send and receive information:

  • https://{BLOCKED}rjbcasuikp.onion.to
  • https://{BLOCKED}4e.ngrok.io
  • https://{BLOCKED}b6.ngrok.io

However, as of this writing, the said sites are inaccessible.

Download Routine

This Backdoor connects to the following website(s) to download and execute a malicious file:

  • https://{BLOCKED}in.com/raw/Dj3JTtnj

It saves the files it downloads using the following names:

  • /tmp/baby -> coinminer payload

As of this writing, the said sites are inaccessible.

Information Theft

This Backdoor gathers the following data:

  • Username
  • Hostname
  • IP Address
  • Operating System Platform

Other Details

This Backdoor takes advantage of the following vulnerabilities:

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.250.07
FIRST VSAPI PATTERN DATE: 22 Jul 2019
VSAPI OPR PATTERN File: 15.251.00
VSAPI OPR PATTERN Date: 23 Jul 2019

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Linux.EMEXIE.A. 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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