Analysis by: Wilbert Vidal
 PLATFORM:

Linux

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

  • Threat Type: Exploit

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

This Exploit 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. It executes commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size: 38,948 bytes
File Type: , ELF
Memory Resident: Yes
Initial Samples Received Date: 21 Apr 2018

Arrival Details

This Exploit arrives on a system as a file dropped by other malware or as a file downloaded unknowingly by users when visiting malicious sites.

This malware arrives via the following means:

Backdoor Routine

This Exploit joins any of the following Internet Relay Chat (IRC) channels:

  • #muh{BLOCKED}

It executes the following commands from a remote malicious user:

  • SH - execute shell command
  • IRC - send arbitrary irc command to server
  • HELP - send help instructions
  • KILL - terminates client
  • KILL_PORT - terminates socket/port
  • GET - download arbitrary file from arbitrary url
  • SSHX - ssh scan provided credentials
  • SSH - ssh scan
  • KILLALL - terminates all current packeting
  • SERVER - set server
  • CBACK - Connect back
  • UNKOWN - send non-spoof udp flood on arbitrary site
  • UDP - send udp flood on arbitrary site
  • PAN - send syn flood on arbitrary site that will kill most network drivers
  • HTTP - send http flood on arbitrary site
  • STD2 - send std2 flood on arbitrary site

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • {BLOCKED}.{BLOCKED}.101.96:9090
  • {BLOCKED}.{BLOCKED}.84.99:9090
  • {BLOCKED}.{BLOCKED}.84.0:9090
  • {BLOCKED}.{BLOCKED}.210.184:9090
  • {BLOCKED}.{BLOCKED}.163.168:9090
  • {BLOCKED}.{BLOCKED}.71.250:9090
  • {BLOCKED}.{BLOCKED}.240.14:9090
  • {BLOCKED}.{BLOCKED}.171.44:9090
  • {BLOCKED}.{BLOCKED}.190.236:9090
  • {BLOCKED}.{BLOCKED}.93.125:9090
  • {BLOCKED}.{BLOCKED}.eu:9090

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.204.06
FIRST VSAPI PATTERN DATE: 21 Apr 2018
VSAPI OPR PATTERN File: 14.205.00
VSAPI OPR PATTERN Date: 22 Apr 2018

Scan your computer with your Trend Micro product to delete files detected as ELF64_MUHSTIK.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 the following Trend Micro Support pages for more information:


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