Author: Clive Fuentebella   

 

Trojan:Linux/Shmusho!MSR (MICROSOFT)

 PLATFORM:

Linux

 OVER ALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 INFORMATION EXPOSURE
Low
Medium
High
Critical

  • Threat Type:
    Backdoor

  • Destructiveness:
    No

  • Encrypted:
    No

  • In the wild:
    Yes

  OVERVIEW

INFECTION CHANNEL: Downloaded from the Internet

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

It does not have any propagation routine.

It runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk.

  TECHNICAL DETAILS

File size: 16,687,104 bytes
Memory resident: Yes
INITIAL SAMPLES RECEIVED DATE: 27 marca 2020
PAYLOAD: Connects to URLs/IPs, Steals information

Arrival Details

This Backdoor 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 Backdoor adds the following folders:

  • /tmp/.ICEd-unix
  • /var/tmp/.ICEd-unix

It drops and executes the following files:

  • /tmp/kdevtmpfsi

Propagation

This Backdoor does not have any propagation routine.

Backdoor Routine

This Backdoor executes the following command(s) from a remote malicious user:

  • Download and execute a file
  • Update downloaded files
  • Execute a command
  • Execute a command and send output to {Server}/o
  • Create an HTTP request
  • Create a TCP request
  • Brute-force Redis instances

Rootkit Capabilities

This Backdoor does not have rootkit capabilities.

Process Termination

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

  • kdevtmpfsi

Information Theft

This Backdoor gathers the following data:

  • OS Version
  • OS Name
  • OS Architecture

Stolen Information

This Backdoor sends the gathered information via HTTP POST to the following URL:

  • {Server}/r

Other Details

This Backdoor does the following:

  • This backdoor checks for the connection to the following URL to choose which C2 server to send and receive information:
    • http://{BLOCKED}.{BLOCKED}.88.102
    • http://{BLOCKED}.{BLOCKED}.169.111
    • http://{BLOCKED}.{BLOCKED}.50.255
    • http://{BLOCKED}.{BLOCKED}.87.220
    • http://{BLOCKED}.{BLOCKED}.220.193
  • This backdoor receives its commands via HTTP GET to the following URL:
    • {Server}/get

It does not exploit any vulnerability.

  SOLUTION

Minimum scan engine: 9.850
First VSAPI Pattern File: 15.834.01
First VSAPI Pattern Release Date: 27 kwietnia 2020
VSAPI OPR PATTERN-VERSION: 15.835.00
VSAPI OPR PATTERN DATE: 28 kwietnia 2020

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Linux.KINSING.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.