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Backdoor.Linux.BASHLITE.AMJ

December 20, 2018
 Analysis by: Henry Alarcon Jr.
 ALIASES:

ELF/Mirai.AE!tr (Fortinet), Linux.BackDoor.Fgt.2447 (DrWeb), Malware.LINUX/Mirai.yqomz (F-Secure)

 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 may arrive in the affected system via ThinkPHP Remote Code Execution exploit.

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:

119,111 bytes

File Type:

ELF

Memory Resident:

No

Initial Samples Received Date:

01 Aug 2019

Payload:

Connects to URLs/IPs, Exploits vulnerability

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:

  • PLSDIE – kill/stop scanner
  • STOP – kill bot process
  • UDP – launch UDP flood
  • TCP – launch TCP flood

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

  • {BLOCKED}.{BLOCKED}.186.118:6949

Other Details

This Backdoor does the following:

  • It uses the following credentials to try to login to other devices:
    • telecomadmin
    • admintelecom
    • digitel
    • telnetadmin
    • adminHW
    • Alphanetworks
    • wrgn39_dlob.hans_dir645_V1
    • wrgn28_dlob_dir412
    • oelinux1234
    • wrgn39_dlob.hans_dir645
    • vizxv
    • samsung
    • Ipc71a
  • It displays the strings below once executed in the command line:
    • cia aliens are near
  • It may spread to other devices by taking advantage of the following vulnerabilities:

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.270.06

FIRST VSAPI PATTERN DATE:

01 Aug 2019

VSAPI OPR PATTERN File:

15.271.00

VSAPI OPR PATTERN Date:

02 Aug 2019

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