Trojan.SH.BROOTKIT.B

February 21, 2020
 Analysis by: Joshua Paul Ignacio
 ALIASES:

Trojan.Linux.Rootkit (IKARUS), BV:Rootkit-C [Rtk] (AVAST)

 PLATFORM:

Linux

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware

This Trojan deletes itself after execution.

  TECHNICAL DETAILS

File Size:

1,307 bytes

File Type:

Other

Memory Resident:

Yes

Initial Samples Received Date:

19 Feb 2020

Payload:

Deletes files

Arrival Details

This malware arrives via the following means:

Installation

This Trojan adds the following folders:

  • /home/$USER/... → Non-Root Privilege

Other System Modifications

This Trojan deletes the following files:

  • /tmp/.../brootkit.sh

Other Details

This Trojan does the following:

  • It creates a copy of brootkit.sh (detected as Trojan.SH.BROOTKIT.C) on the following directories:
    • /etc/profile.d/emacs.sh → overwrites the original emacs.sh
    • /usr/include/... → Root Privilege
    • /home/$USER/... → Non-Root Privilege

It deletes itself after execution.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.698.02

FIRST VSAPI PATTERN DATE:

19 Feb 2020

VSAPI OPR PATTERN File:

15.699.00

VSAPI OPR PATTERN Date:

20 Feb 2020

Scan your computer with your Trend Micro product to clean files detected as Trojan.SH.BROOTKIT.B. 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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