Analysis by: Cris Nowell Pantanilla
ALIASES:

Backdoor.Linux.Mayday.g (Kaspersky), Linux/Elknot.A (ESET-NOD32)

 PLATFORM:

Linux

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: Yes

  • In the wild: Yes

  OVERVIEW

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.

It 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: 1,128,800 bytes
File Type: ELF
Memory Resident: Yes
Initial Samples Received Date: 11 Nov 2016

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.

Backdoor Routine

This Trojan executes the following commands from a remote malicious user:

  • Get system information
  • Get processor information
  • Get memory information
  • Manipulate files and directories
  • Execute commands
  • Perform DDOS attack

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

  • {BLOCKED}.{BLOCKED}.81.131:10991

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 12.892.05
FIRST VSAPI PATTERN DATE: 11 Nov 2016
VSAPI OPR PATTERN File: 12.893.00
VSAPI OPR PATTERN Date: 12 Nov 2016

Scan your computer with your Trend Micro product to delete files detected as ELF_DDOSER.DJD. 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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