Analysis by: Patrick Angelo Roderno
ALIASES:

Linux.Chikdos.B!gen2 (NORTON); Backdoor:Linux/Setag!rfn (MICROSOFT); HEUR:Backdoor.Linux.Ganiw.d (KASPERSKY)

 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: Downloaded from the Internet, Dropped by other malware

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

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size: 1,223,123 bytes
File Type: ELF
Memory Resident: No
Initial Samples Received Date: 01 Nov 2018
Payload: Drops files, Connects to URLs/IPs, Steals information

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.

Installation

This Backdoor drops the following copies of itself into the affected system and executes them:

  • /usr/bin/bsd-port/getty

It creates the following folders:

  • /usr/bin/dpkgd
  • /usr/bin/bsd-port

Backdoor Routine

This Backdoor executes the following commands from a remote malicious user:

  • Initiate DDoS attacks:
    • SYN flood
    • DNS flood
    • ICMP flood
    • UDP flood
    • TCP flood
    • TNS poisoning
    • Challenge Collapsar (CC) attack
  • Stop DDoS attack
  • Execute shell commands

Dropping Routine

This Backdoor drops the following files:

  • /usr/bin/bsd-port/getty.lock
  • /tmp/gates.lod
  • /tmp/moni.lod
  • /tmp/notify.file

Information Theft

This Backdoor gathers the following data:

  • OS name
  • OS version
  • CPU clock rate
  • CPU usage
  • Number of CPU cores
  • Network usage
  • RAM size
  • IP address of infected machine

Other Details

This Backdoor connects to the following website to send and receive information:

  • {BLOCKED}.{BLOCKED}.163.68
  • {BLOCKED}.{BLOCKED}.192.68
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  • {BLOCKED}.{BLOCKED}.7.6
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  • {BLOCKED}.{BLOCKED}.0.20
  • {BLOCKED}.{BLOCKED}.46.151
  • {BLOCKED}.{BLOCKED}.195.68
  • {BLOCKED}.{BLOCKED}.196.115
  • {BLOCKED}.{BLOCKED}.196.212
  • {BLOCKED}.{BLOCKED}.196.228
  • {BLOCKED}.{BLOCKED}.196.230
  • {BLOCKED}.{BLOCKED}.196.232
  • {BLOCKED}.{BLOCKED}.196.237
  • {BLOCKED}.{BLOCKED}.112.10
  • {BLOCKED}.{BLOCKED}.17.107
  • {BLOCKED}.{BLOCKED}.28.231
  • {BLOCKED}.{BLOCKED}.28.234
  • {BLOCKED}.{BLOCKED}.28.237
  • {BLOCKED}.{BLOCKED}.6.3
  • {BLOCKED}.{BLOCKED}.136.10
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  • {BLOCKED}.{BLOCKED}.148.37
  • {BLOCKED}.{BLOCKED}.148.39
  • {BLOCKED}.{BLOCKED}.26.42
  • {BLOCKED}.{BLOCKED}.32.100
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  • {BLOCKED}.{BLOCKED}.2.18
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  • {BLOCKED}.{BLOCKED}.255.1
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  • {BLOCKED}.{BLOCKED}.92.86
  • {BLOCKED}.{BLOCKED}.92.98

It does the following:

  • capable of updating itself to its latest version
  • replaces the following files with the copy of the malware and stores the original files in /usr/bin/dpkg/:
    • /bin/netstat
    • /bin/lsof
    • /bin/ps
    • /bin/ss
    • /usr/bin/netstat
    • /usr/bin/lsof
    • /usr/bin/ps
    • /usr/bin/ss
    • /usr/sbin/netstat
    • /usr/sbin/lsof
    • /usr/sbin/ps
    • /usr/sbin/ss
  • It adds the following scripts in /etc/rc{1-5}.d/ and /etc/init.d/ to automatically execute itself when the system starts up:
    • /etc/rc{1-5}.d/S97DbSecuritySpt
    • /etc/rc{1-5}.d/S99selinux
    • /etc/init.d/selinux
    • /etc/init.d/DbSecuritySpt

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 14.568.04
FIRST VSAPI PATTERN DATE: 16 Oct 2018
VSAPI OPR PATTERN File: 15.237.00
VSAPI OPR PATTERN Date: 16 Jul 2019

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Linux.SETAG.RPA. 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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