Analysis by: John Kevin Sanchez
 Modified by: Joselyn Canuela
ALIASES:

Trojan.Backdoor.Linux.Gafgyt.1 (Arcabit), Gen:Variant.Backdoor.Linux.Gafgyt.1 (BitDefender), ELF/Trojan.TGFJ-7 (Cyren), Trojan.Linux.Fgt (Ikarus)

 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 runs certain commands that it receives remotely from a malicious user. Doing this puts the affected computer and information found on the computer at greater risk.

  TECHNICAL DETAILS

File Size: 147,204 bytes
File Type: ELF
Initial Samples Received Date: 27 Oct 2016
Payload: Connects to URLs/IPs, Collects system information, Downloads files, Executes 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.

Backdoor Routine

This Backdoor executes the following command(s) from a remote malicious user:

  • PING -> check if the server and bot are alive
  • NUP -> convert IP address to string
  • SPOOF -> Set an IP or an IP range for spoofing
  • KILLSUB -> terminate backdoor if sub version matched
  • TABLE -> return the table size
  • SCAN -> Disable/enable the telnet scanner
  • GETLOCALIP -> get local IP address
  • GETPUBLICIP -> get public IP address
  • VERSION -> Return backdoor's version
  • RANGE -> set range of IP
  • SPOOFABLE -> check if IP address can be spoof
  • HTTP -> DDos using HTTP packet
  • UDP -> DDoS using UDP packet
  • TCP -> DDoS using TCP packet
  • CNC -> connect to specified CNC server regularly
  • STD -> Launch a DDoS attack
  • KILLATTK -> Kill the bot processes
  • LOLNOGTFO -> terminate bot

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

  • {BLOCKED}.{BLOCKED}.1.233:666

Other Details

This Backdoor does the following:

  • Get CPU Information
  • Get System Information
  • Get network activity
  • Download file and execute
  • Execute Shell

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 12.892.04
FIRST VSAPI PATTERN DATE: 11 Nov 2016
VSAPI OPR PATTERN File: 12.893.00
VSAPI OPR PATTERN Date: 12 Nov 2017

Scan your computer with your Trend Micro product to delete files detected as ELF_BASHLITE.DJD. 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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