Analysis by: John Rainier Navato
ALIASES:

Backdoor:Linux/Rekobee (MICROSOFT)

 PLATFORM:

Linux

 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.

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

  TECHNICAL DETAILS

File Size: 86,176 bytes
File Type: ELF
Initial Samples Received Date: 24 May 2024
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 files:

  • /tmp/CCCCCCCC

It adds the following processes:

  • /tmp/CCCCCCCC

Other Details

This Backdoor connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}.{BLOCKED}.36:8443

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

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 19.360.05
FIRST VSAPI PATTERN DATE: 24 May 2024
VSAPI OPR PATTERN File: 19.361.00
VSAPI OPR PATTERN Date: 24 May 2024

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.XXELFC1DFF040

Step 2

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