ELF_XORDDOS.ARC

December 24, 2015
 Analysis by: Janus Agcaoili
 ALIASES:

Linux.Xorddos (Symantec), DoS:Linux/Xorddos.A (Microsoft), Trojan-DDoS.Linux.Xarcen.c (Kaspersky)

 PLATFORM:

UNIX, 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:

625,707 bytes

File Type:

ELF

Memory Resident:

Yes

Initial Samples Received Date:

20 Sep 2015

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 copies of itself into the affected system:

  • /lib/libudev.so

Autostart Technique

This backdoor drops the following files:

  • /etc/cron.hourly/gcc.sh (Cron is a time-based job scheduler in Unix-like computer operating systems)

Other Details

This backdoor connects to the following possibly malicious URL:

  • aaa.{BLOCKED}t456.com:6003
  • aaa.{BLOCKED}t456.com:6003
  • www1.{BLOCKED}t456.com/dd.rar

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

11.930.07

FIRST VSAPI PATTERN DATE:

20 Sep 2015

VSAPI OPR PATTERN File:

11.931.00

VSAPI OPR PATTERN Date:

21 Sep 2015

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