Analysis by: Jennifer Gumban
 PLATFORM:

Linux

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

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.

It executes commands from a remote malicious user, effectively compromising the affected system.

It saves downloaded files into the said created folder.

  TECHNICAL DETAILS

File Size: 152,286 bytes
File Type: ELF
Memory Resident: Yes
Initial Samples Received Date: 27 Oct 2016
Payload: Connects to URLs/IPs, Downloads files

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 searches for the following folders where it can drop/create files:

  • /tmp
  • /var/run
  • /mnt
  • /root
  • /

Backdoor Routine

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

  • BADBOT
  • BOGOMIPS
  • PING
  • TELNET LOGIN CRACKED
  • REPORT
  • INFECTION SUCCESS
  • FAILED TO INFECT
  • PONG!
  • NUP
  • TEST
  • SPOOF
  • KILLSUB
  • KMS!
  • TABLE
  • SCAN
  • GETLOCALIP
  • GETPUBLICIP
  • VERSION
  • RANGE
  • SPOOFABLE
  • HTTP
  • UDP
  • TCP
  • CNC
  • STD
  • KILLATTK
  • LOLNOGTFO
  • BUILD
  • PONG
  • DUP
  • SH

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

  • {BLOCKED}.{BLOCKED}.1.233:666

Download Routine

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

  • bins.sh
  • tftp1.sh
  • tftp2.sh
  • ftp1.sh

It saves downloaded files into the said created folder.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.440.05
FIRST VSAPI PATTERN DATE: 31 May 2017

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