Analysis by: Karen Ivy Titiwa

 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: 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: 623 bytes
File Type: Script
Memory Resident: Yes
Initial Samples Received Date: 09 Jun 2020
Payload: Connects to URLs/IPs, Deletes files, Terminates processes, Modifies HOSTS file

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.

Other System Modifications

This Trojan deletes the following files:

  • /etc/id.services.conf
  • /etc/32679
  • /tmp/.img

Process Termination

This Trojan terminates the following processes if found running in the affected system's memory:

  • process with PID 32679

Download Routine

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

  • http://{BLOCKED}.{BLOCKED}.160.189/linux_arm
  • http://{BLOCKED}.{BLOCKED}.18.221:808/808/linux_arm
  • http://{BLOCKED}.{BLOCKED}.18.221:808/808/linux_amd64;

HOSTS File Modification

This Trojan modifies the system's HOSTS files to redirect users once the following Web site(s) are accessed:

  • 9.9.9.9 www.{BLOCKED}6.com
  • 9.9.9.9 www.{BLOCKED}rver.xyz
  • 9.9.9.9 www.{BLOCKED}ot.xyz
  • 9.9.9.9 www.{BLOCKED}1.com

Other Details

This Trojan deletes the following files to remove its traces in the system:

  • Adds the following process to delete its traces:
    • rm -rf linux*;
    • rm -rf *.sh;
    • history -c;
    • cd /usr/bin; rm -rf whoami yes x86_64 perl touch apt* du head find last du stat who whami wget curl;
    • cd /bin/; rm -rf mv ps sleep touch ss mkdir dd cat chmod dir ip su sed ping* ls cp login sh sed rm rmdir gzip echo date ls dir pwd rm tar sh hostname dir cat bash; history -c;

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.920.05
FIRST VSAPI PATTERN DATE: 09 Jun 2020
VSAPI OPR PATTERN File: 15.921.00
VSAPI OPR PATTERN Date: 10 Jun 2020

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