Analysis by: Wilbert Luy
ALIASES:

HEUR:Backdoor.Linux.Tsunami.bh ( Kaspersky ), Backdoor:Linux/Tsunami.gen!A ( Microsoft )

 PLATFORM:

Linux

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

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.

It connects to Internet Relay Chat (IRC) servers.

  TECHNICAL DETAILS

File Size: 554,456 bytes
File Type: ELF
Memory Resident: Yes
Initial Samples Received Date: 12 Mar 2019
Payload: Connects to URLs/IPs

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 Internet Relay Chat (IRC) servers:

  • {BLOCKED}.{BLOCKED}.105.87
  • 1337hub.{BLOCKED}me.net

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

  • #.#

It accesses a remote Internet Relay Chat (IRC) server where it receives the following commands from a remote malicious user:

  • PING - return pong
  • JOIN - JOIN channel and give channel operator
  • KICK - JOIN
  • NICK - change nickname
  • PRIVMSG -
    • TSUNAMI - DDOS
    • PAN - SYN FLOOD
    • UDP - UDP FLOOD
    • UNKNOWN - UDP FLOOD non-spoofed
    • NICK - change or set nickname
    • SERVER - change server
    • GETSPOOFS - create spoofing parameters
    • SPOOFS - change spoofing to subnet
    • DISABLE - stop backdoor
    • ENABLE - continue backdoor
    • KILL - not implemented
    • GET - download file from a web address
    • KILLALL - terminate the program
    • VERSION - sends ( kaiten wa goraku )
    • HELP - list all commands
  • 352 - SPOOF REQUEST
  • 376 - MODE, JOIN, WHO
  • 433 - set nickname

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.872.05
FIRST VSAPI PATTERN DATE: 15 Mar 2019
VSAPI OPR PATTERN File: 14.873.00
VSAPI OPR PATTERN Date: 16 Mar 2019

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Linux.KAITEN.AB. 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 the following Trend Micro Support pages for more information:


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