Analysis by: Wilbert Luy
 ALIASES:

HEUR:Backdoor.Linux.Agent.ca (Kaspersky), Trojan:Win32/CoinMiner.C!cl (Microsoft)

 PLATFORM:

Linux

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Canal de infecção: Downloaded from the Internet, Dropped by other malware

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

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

  TECHNICAL DETAILS

Tipo de compactação: 97,641 bytes
Tipo de arquivo: ELF
Residente na memória: Yes
Data de recebimento das amostras iniciais: 05 Jun 2019
Carga útil: Connects to URLs/IPs

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Download Routine

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

  • http://w.{BLOCKED}n.com:43768/init.sh

Other Details

This Trojan does the following:

  • It replaces the original rm of the system to perform malicious routine when rm is called and will still execute the original rm in /usr/bin/rmm.
  • It removes the immutable and append only properties of the following files and reverts it back after execution:
    • /var/spool/cron
    • /var/spool/cron/root
  • It does the following commands to create a scheduled task or cron job:
    • cat \'/var/spool/cron/root\' |grep init.sh 318
    • echo >> /var/spool/cron/root
  • It does the following commands:
    • chmod 644 /var/spool/cron/root
    • chattr +ia /etc/cron.d

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

  SOLUTION

Mecanismo de varredura mínima: 9.850
VSAPI OPR Pattern Version: 15.151.00
VSAPI OPR Pattern veröffentlicht am: 03 Jun 2019

Scan your computer with your Trend Micro product to delete files detected as Trojan.Linux.ZYX.USELVF319. 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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