Analysis by: Francis Xavier Antazo
ALIASES:

DoS:Linux/Xorddos.A (Microsoft); a variant of Linux/Xorddos.C trojan (ESET); HEUR:Trojan-DDoS.Linux.Xarcen.a (Kaspersky); Trojan horse Linux/DDoS.XOR (AVG);

 PLATFORM:

Unix,Linux

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: Yes

  • 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: 625817 bytes
File Type: ELF
Memory Resident: Yes
Initial Samples Received Date: 07 Dec 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:

  • /var/run/gcc.pid
  • /lib/libudev.so

Autostart Technique

This backdoor drops the following files:

  • /etc/cron.hourly/gcc.sh

Other Details

This backdoor connects to the following possibly malicious URL:

  • http://pcdown.{BLOCKED}s.com:8080/cfg.rar
  • http://soft8.{BLOCKED}s.com:2208
  • {BLOCKED}.{BLOCKED}.246.145:2208
  • baidu.{BLOCKED}s.com:2208