Analysis by: Wilbert Luy

ALIASES:

HEUR:Backdoor.Linux.Gafgyt.a (Kaspersky)

 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: 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.

  TECHNICAL DETAILS

File Size: 119,562 bytes
File Type: ELF
Memory Resident: Yes
Initial Samples Received Date: 20 Aug 2019
Payload: Connects to URLs/IPs, Displays message/message boxes

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 commands from a remote malicious user:

  • HTTP - HTTP hex flood
  • UDP - UDP flood
  • STD - STD flood
  • TCP - TCP flood
  • CRASH - RTCP flood
  • CRUSH - TCP and STD flood
  • SMITE - VSE flood
  • CNC - connect to specific CNC
  • KILL - STOP bot operation

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

  • {BLOCKED}.{BLOCKED}.117.22

Other Details

This Backdoor does the following:

  • Upon execution it will display the following string:
      "Gosh that chinese family at the other table sure ate alot"

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.312.04
FIRST VSAPI PATTERN DATE: 21 Aug 2019
VSAPI OPR PATTERN File: 15.313.00
VSAPI OPR PATTERN Date: 22 Aug 2019

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Linux.BASHLITE.MESS. 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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