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Backdoor.Linux.KINSING.A

April 30, 2020
 Analysis by: Clive Fuentebella
 ALIASES:

Trojan:Linux/Shmusho!MSR (MICROSOFT)

 PLATFORM:

Linux

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

  • 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 Mar 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 DATE:

27 Apr 2020

VSAPI OPR PATTERN File:

15.835.00

VSAPI OPR PATTERN Date:

28 Apr 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:


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