Analysis by: Karen Ivy Titiwa
ALIASES:

Backdoor.Linux.Tsunami.gen(KASPERSKY); Backdoor.Linux.Tsunami.A(QUICKHEAL)

 PLATFORM:

Linux

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: 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 joins an Internet Relay Chat (IRC) channel.

  TECHNICAL DETAILS

File Size: 179,108 bytes
File Type: ELF
Memory Resident: Yes
Initial Samples Received Date: 10 Jul 2020
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 joins any of the following Internet Relay Chat (IRC) channels:

  • #xxx

It posts the following information to its command and control (C&C) server:

  • c4k.xpl.{BLOCKED}s.pw
  • {BLOCKED}.{BLOCKED}.75.25
  • {BLOCKED}.{BLOCKED}.11.170

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

  • 352 - used to send spoof request
  • 376 - used to execute the following commands: Mode, Join, Who
  • 433 - used to set nickname
  • PRIVMSG:
    • TSUNAMI - DDOS
    • PAN - SYN flood
    • UDP - UDP flood
    • UNKNOWN - Another non-spoof UDP flood
    • NICK - Changes the nick of the client
    • SERVER - Changes servers
    • GETSPOOFS- Gets the current spoofing
    • SPOOFS - Changes spoofing to a subnet
    • DISABLE- Disables all packeting from this client
    • ENABLE - Enables all packeting from this client
    • KILL - Kills the client
    • GET - Downloads a file off the web and saves it onto the hd
    • VERSION - Requests version of client
    • KILLALL - Kills all current packeting
    • HELP - Displays the list of command
    • IRC - Sends this command to the server
    • SH - Executes a command
  • PING - used to get Pong
  • JOIN - used to give channels or nickname operators control
  • KICK - used to join a specified channel
  • NICK - used to get the nickname

Other Details

This Backdoor does the following:

  • It reads the contents of the following files:
    • /etc/hosts
    • /etc/resolv.conf

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 16.196.04
FIRST VSAPI PATTERN DATE: 30 Aug 2020
VSAPI OPR PATTERN File: 16.197.00
VSAPI OPR PATTERN Date: 31 Aug 2020

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Linux.KAITEN.AMV. 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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