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ELF_MIRAI.KA

November 28, 2017
 Analysis by: Jennifer Gumban
 PLATFORM:

Linux

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • 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 listens on ports. It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size:

(varies) bytes

File Type:

ELF

Memory Resident:

Yes

Initial Samples Received Date:

18 Nov 2017

Payload:

Connects to URLs/IPs, Downloads 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 listens on the following port(s):

  • 23
  • 2323

It connects to the following websites to send and receive information:

  • {BLOCKED}ister.nl:23

Download Routine

This Backdoor connects to the following URL(s) to download its component file(s):

  • http://{BLOCKED}.{BLOCKED}.173.20/amnyu.{sh4|spc|x86|arm7|arm|m68k|mips|mpsl|ppc}
  • http://{BLOCKED}ister.nl/bins/mirai.{arm|arm5n|arm6|arm7|i486|i686|m68k|mips|mips64|mpsl|ppc|ppc440|sh4|spc|x86|x86_64}

Other Details

This Backdoor does the following:

  • Uses common or factory-default usernames and passwords to login to attacked devices
  • Downloads files
  • Executes shell
  • Performs DDOS attacks

  SOLUTION

Minimum Scan Engine:

9.850

Scan your computer with your Trend Micro product to delete files detected as ELF_MIRAI.KA. 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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