Analysis by: Clive Fuentebella
 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.

  TECHNICAL DETAILS

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 drops the following files:

  • /tmp/kira.txt

Backdoor Routine

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

  • Execute arbitrary commands

It uses the following mail servers to send and receive information:

  • {BLOCKED}.{BLOCKED}.213.147:8888

Information Theft

Upon execution of the affected application, it gathers the following information:

  • Contents of /etc/passwd

Stolen Information

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

  • http://{BLOCKED}p3bhee98oce9i0cte93092xr.burpcollaborator.net

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 17.250.02
FIRST VSAPI PATTERN DATE: 13 Dec 2021
VSAPI OPR PATTERN File: 17.251.00
VSAPI OPR PATTERN Date: 14 Dec 2021

Scan your computer with your Trend Micro product to delete files detected as Backdoor.SH.KIRABASH.YXBLL. 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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