Analysis by: RonJay Kristoffer Caragay
ALIASES:

Trojan.Linux.DDoS (Ikarus); ELF:Chinaz-A [Trj] (Avast); Trojan-DDoS.Linux.Znaich.a (Kaspersky); Linux/DDoS-Flood.A (McAfee);

 PLATFORM:

Linux, Unix

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This backdoor may be downloaded from remote sites by other malware.

It connects to a website to send and receive information.

  TECHNICAL DETAILS

File Size: 618,948 bytes
File Type: ELF
Memory Resident: No
Initial Samples Received Date: 17 Jan 2015

Arrival Details

This backdoor may be downloaded from remote site(s) by the following malware:

Backdoor Routine

This backdoor connects to the following websites to send and receive information:

  • aa.{BLOCKED}352.com
  • {BLOCKED}352.com
  • {BLOCKED}1.12.{BLOCKED}3.173

Information Theft

This backdoor gathers the following data:

  • System info
  • Process info
  • Memory info
  • Version info
  • Hostname

Other Details

This backdoor does the following:

  • performs DDOS attack
  • floods network
  • manipulate files and directories
  • manipulate process and services
  • download and execute arbitrary files
  • execute commands
  • modifies thread/process priority
  • performs spoof

NOTES:

It modifies /etc/rc.local to enable automatic execution at every system start up.

  SOLUTION

Minimum Scan Engine: 9.700
FIRST VSAPI PATTERN FILE: 11.416.08
FIRST VSAPI PATTERN DATE: 16 Jan 2015
VSAPI OPR PATTERN File: 11.417.00
VSAPI OPR PATTERN Date: 16 Jan 2015

Step 1

Remove the malware/grayware file that dropped/downloaded UNIX_FLOODDOS.A. (Note: Please skip this step if the threat(s) listed below have already been removed.)

     
    • HKTL_SHELLSHOCK

Step 2

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