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ELF_GAFGYT.DGB

July 06, 2017
 Analysis by: Jennifer Gumban
 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

This Backdoor listens on port(s). It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

ELF

Initial Samples Received Date:

18 Aug 2014

Payload:

Connects to URLs/IPs

Arrival Details

This Backdoor may be downloaded from the following remote site(s):

  • {BLOCKED}.{BLOCKED}.225.96
  • {BLOCKED}.{BLOCKED}.99.84

Installation

This Backdoor drops a copy of itself in the following folders using different file names:

  • /dev/.{random}/dvrHelper

Backdoor Routine

This Backdoor listens on the following port(s):

  • 48101

It connects to the following websites to send and receive information:

  • {BLOCKED}.{BLOCKED}.202.53

Other Details

This Backdoor does the following:

  • It uses telnet in order to execute a shell command that installs malware. The attack uses brute login and the following commands:
    • {Username}
    • {Passwords}
    • enable
    • system
    • shell
    • sh
    • bin/busybox MIRAI

  SOLUTION

Minimum Scan Engine:

9.800

Step 1

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 2

Restart in normal mode and scan your computer with your Trend Micro product for files detected as ELF_GAFGYT.DGB. 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 this Knowledge Base page for more information.


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