Analysis by: Wilbert Luy

ALIASES:

HEUR:Backdoor.Linux.Gafgyt.bj ( Kaspersky ), Trojan:Win32/Ditertag.A ( Microsoft )

 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, Dropped by other malware

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: 87,625 bytes
File Type: ELF
Memory Resident: Yes
Initial Samples Received Date: 16 Sep 2019
Payload: Connects to URLs/IPs

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:

  • RHTTP - HTTP FLOOD
  • TCP - TCP FLOOD with customizable TCP FLAGS (may perform XMAS flood)
  • UDP - UDP flood or UDP flood with random strings
  • RVSE - VSE flood or VSE flood with random strings
  • RSTD - UDP flood with specific strings
  • STOP,stop,Stop - kill bot operation

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

  • {BLOCKED}.{BLOCKED}.138.188:4554

Other Details

This Backdoor does the following:

  • It can report the OS,PORT and ARCHITECTURE to the CNC server.
  • It connects to Google to get the IP address of the infected machine.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.376.04
FIRST VSAPI PATTERN DATE: 19 Sep 2019
VSAPI OPR PATTERN File: 15.377.00
VSAPI OPR PATTERN Date: 20 Sep 2019

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