Analysis by: Mar Philip Elaurza
ALIASES:

Linux.Backdoor.Kaiten (NORTON), Linux/Tsunami-A (SOPHOS_LITE)

 PLATFORM:

Linux, Unix

 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: 23,079 bytes
File Type: ELF
Memory Resident: Yes
Initial Samples Received Date: 15 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.

Backdoor Routine

This backdoor connects to any of the following IRC server(s):

  • {BLOCKED}c.{BLOCKED}vhosting.com:6667

It joins any of the following IRC channel(s):

  • #Kaiten

Other Details

This backdoor uses the following credentials when accessing its IRC server:

  • NICK = {random}
  • USER = {random}
  • KEY = "woot"

NOTES:

This malware adds a line for autostart in /etc/rc.d/rc.local or /etc/rc.conf.

  SOLUTION

Minimum Scan Engine: 9.750
FIRST VSAPI PATTERN FILE: 11.934.05
FIRST VSAPI PATTERN DATE: 22 Sep 2015
VSAPI OPR PATTERN File: 11.935.00
VSAPI OPR PATTERN Date: 23 Sep 2015

Restart in normal mode and scan your computer with your Trend Micro product for files detected as ELF_KAITEN.SN. 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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