Analysis by: Cris Nowell Pantanilla

 PLATFORM:

LINUX ARM

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

New Linux Arm malware spread via RFIs in cgi-bin scripts.

This backdoor executes commands from a remote malicious user, effectively compromising the affected system. It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size: 676,245 bytes
File Type: ELF
Memory Resident: Yes
Initial Samples Received Date: 28 Feb 2017
Payload: Connects to URLs/IPs

Arrival Details

This backdoor may be downloaded from the following remote sites:

  • http://{BLOCKED}.{BLOCKED}.116.3:8080/Arm1
  • http://{BLOCKED}.{BLOCKED}.116.21:85/Arm1
  • http://{BLOCKED}.{BLOCKED}.108.2:8080/Arm1

Backdoor Routine

This backdoor opens the following port(s) where it listens for remote commands:

  • 127.0.0.1:39999

It executes the following commands from a remote malicious user:

  • Get system info
  • Get CPU info
  • Get network activity
  • Execute Shell
  • Perform DDOS Attack
  • Kill self

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

  • {BLOCKED}.{BLOCKED}.108.2

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.246.10
FIRST VSAPI PATTERN DATE: 28 Feb 2017
VSAPI OPR PATTERN File: 13.247.00
VSAPI OPR PATTERN Date: 01 Mar 2017

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product to delete files detected as ELF_IMEIJ.A. 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 this Knowledge Base page for more information.


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