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ELF_GAFGYT.JRN

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 executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

It receives commands from a server that may be controlled by a bot or a malicious user.

  TECHNICAL DETAILS

File Size:

Varies

File Type:

ELF

Initial Samples Received Date:

18 Aug 2014

Payload:

Connects to URLs/IPs, Compromises system security, Launches DoS/DDoS attacks

Arrival Details

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

  • http://{BLOCKED}.{BLOCKED}.249.8/apache2

Backdoor Routine

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

  • BOGOMIPS
  • PING
  • GETLOCALIP
  • SCANNER
  • SSH ON
  • HTTP
  • KILLATTK
  • LOLNOGTFO
  • DARKAI
  • PONG

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

  • {BLOCKED}.{BLOCKED}.249.8:777
  • {BLOCKED}.{BLOCKED}.237.120:23
  • {BLOCKED}.{BLOCKED}.49.107:23

Download Routine

This Backdoor saves the files it downloads using the following names:

  • gtop.sh
  • tftp1.sh
  • tftp2.sh
  • ftp1.sh

Other Details

This Backdoor does the following:

  • It execute shell commands that installs malware
  • It uses brute force login via telnet
  • It takes advantage of shell shock vulnerabilities
  • Perform DDOS attack

Denial of Service

This Backdoor receives commands from a server that may be controlled by a bot or a malicious user.

  SOLUTION

Minimum Scan Engine:

9.850

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.JRN. 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.

Step 3

Scan your computer with your Trend Micro product to delete files detected as ELF_GAFGYT.JRN. 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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