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Backdoor.Linux.NOODLERAT.ZKJJ

October 24, 2022
 Analysis by: Khristian Joseph Morales
 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


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 executes commands from a remote malicious user, effectively compromising the affected system.

However, as of this writing, the said sites are inaccessible.

  TECHNICAL DETAILS

File Size:

86,208 bytes

File Type:

ELF

Memory Resident:

No

Initial Samples Received Date:

13 Oct 2022

Payload:

Connects to URLs/IPs, Drops files, Adds processes, Executes commands from the malicious user

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 drops the following copies of itself into the affected system:

  • /tmp/CCCCCCCCCCCCCCCC → deletes afterwards

It adds the following processes:

  • "/tmp/CCCCCCCCCCCCCCCC"

Propagation

This Backdoor does not have any propagation routine.

Backdoor Routine

This Backdoor executes the following commands from a remote malicious user:

  • Reverse Shell
  • File Management (Create/Search Directory, Rename/Delete/Upload/Download File)
  • Timer Management (Get current time, Set next execution time)
  • Socks Tunneling

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}.{BLOCKED}.174.15:443

Rootkit Capabilities

This Backdoor does not have rootkit capabilities.

Other Details

This Backdoor does the following:

  • Run itself as a daemon
  • It sends the output of the executed command back to the C&C Server
  • It checks for the current time and day
    • if it matches it's config, it will attempt to connect to it's C&C Server
    • if not, it will sleep then will check for the current time and day after the specified time
  • It can create either the following files that contains a timestamp (year, month, day, hour, minutes) for when the C&C connection will connect
    • /usr/include/sdfwex.h
    • /tmp/.llock

However, as of this writing, the said sites are inaccessible.

It does not exploit any vulnerability.

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

17.882.04

FIRST VSAPI PATTERN DATE:

18 Oct 2022

VSAPI OPR PATTERN File:

17.883.00

VSAPI OPR PATTERN Date:

19 Oct 2022

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

     
    • Troj.ELF.TRX.XXELFC1DFF020

Step 2

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