Analysis by: John Rey Canon
ALIASES:

Linux/ShellDLoader.RMF!tr (Fortinet); Linux/ShellLoader.b (McAfee)

 PLATFORM:

Linux

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

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

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

  TECHNICAL DETAILS

File Size: 1,420 bytes
File Type: Other
Memory Resident: No
Initial Samples Received Date: 23 Mar 2019
Payload: Connects to URLs/IPs, Deletes files

Arrival Details

This Trojan arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

Download Routine

This Trojan connects to the following website(s) to download and execute a malicious file:

  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.213/ECHOBOT.mips
  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.213/ECHOBOT.mpsl
  • http://{BLOCKED}.{BLOCKED}.{BLOCKED}.213/ECHOBOT.sh4
  • http://{BLOCKED}.{BLOCKED}.25.213/ECHOBOT.x86
  • http://{BLOCKED}.{BLOCKED}.25.213/ECHOBOT.arm6
  • http://{BLOCKED}.{BLOCKED}.25.213/ECHOBOT.i686
  • http://{BLOCKED}.{BLOCKED}.25.213/ECHOBOT.ppc
  • http://{BLOCKED}.{BLOCKED}.25.213/ECHOBOT.i586
  • http://{BLOCKED}.{BLOCKED}.25.213/ECHOBOT.m68k
  • http://{BLOCKED}.{BLOCKED}.25.213/ECHOBOT.sparc
  • http://{BLOCKED}.{BLOCKED}.25.213/ECHOBOT.arm4
  • http://{BLOCKED}.{BLOCKED}.25.213/ECHOBOT.arm5
  • http://{BLOCKED}.{BLOCKED}.25.213/ECHOBOT.arm7
  • http://{BLOCKED}.{BLOCKED}.25.213/ECHOBOT.ppc440fp

It saves the files it downloads using the following names:

  • {Malware Directory}/ECHOBOT.mips
  • {Malware Directory}/ECHOBOT.mpsl
  • {Malware Directory}/ECHOBOT.sh4
  • {Malware Directory}/ECHOBOT.x86
  • {Malware Directory}/ECHOBOT.arm6
  • {Malware Directory}/ECHOBOT.i686
  • {Malware Directory}/ECHOBOT.ppc
  • {Malware Directory}/ECHOBOT.i586
  • {Malware Directory}/ECHOBOT.m68k
  • {Malware Directory}/ECHOBOT.sparc
  • {Malware Directory}/ECHOBOT.arm4
  • {Malware Directory}/ECHOBOT.arm5
  • {Malware Directory}/ECHOBOT.arm7
  • {Malware Directory}/ECHOBOT.ppc440fp

Other Details

This Trojan does the following:

  • It deletes all the downloaded files after each execution.

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.900.02
FIRST VSAPI PATTERN DATE: 27 Mar 2019
VSAPI OPR PATTERN File: 14.901.00
VSAPI OPR PATTERN Date: 28 Mar 2019

Scan your computer with your Trend Micro product to clean files detected as Trojan.SH.BASHDLOD.AMF. 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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