Analysis by: Pearl Charlaine Espejo
ALIASES:

LINUX/Xorddos.uxfdn (Avira); Linux/DDoS-BH (Sophos); ELF:Xorddos-AD [Trj] (Avast); Linux/DDoS.XOR.16 (AVG)

 PLATFORM:

Linux

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

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.

  TECHNICAL DETAILS

File Size: 255,852 bytes
File Type: ELF
Memory Resident: Yes
Initial Samples Received Date: 16 Mar 2017

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.

Installation

This Backdoor drops the following files:

  • /usr/bin/{random 10 characters}
  • /bin/{random 10 characters}
  • /tmp/{random 10 characters}
  • /etc/cron.hourly/gcc4.sh

It drops the following copies of itself into the affected system:

  • /lib/libudev4.so

Other Details

This Backdoor connects to the following possibly malicious URL:

  • {BLOCKED}.{BLOCKED}.114.114 (dns.{BLOCKED}g.top)
  • {BLOCKED}.{BLOCKED}.76.252:6552

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 13.280.06
FIRST VSAPI PATTERN DATE: 16 Mar 2017
VSAPI OPR PATTERN File: 13.281.00
VSAPI OPR PATTERN Date: 17 Mar 2017

Scan your computer with your Trend Micro product to delete files detected as ELF_XORDDOS.TNN. 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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