Backdoor.Linux.BASHLITE.SMJC3

September 20, 2019
 Analysis by: Wilbert Luy
 ALIASES:

HEUR:Backdoor.Linux.Gafgyt.cu ( 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:

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.

  TECHNICAL DETAILS

File Size:

102,445 bytes

File Type:

ELF

Memory Resident:

Yes

Initial Samples Received Date:

18 Sep 2019

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 executes the following commands from a remote malicious user:

  • UDP - UDP flood or UDP flood with random strings
  • XMAS - TCP flood (flags are set to high)
  • VSE - VSE flood or VSE flood with random strings
  • TCP - TCP flood with a flag set to high or all flags set to high (XMAS)
  • STD - UDP flood with specific strings.
  • HEX STOP - stop bot operation

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

  • 192.{BLOCKED}.{BLOCKED}.154:6535

Other Details

This Backdoor does the following:

  • It accesses /proc/net/route to obtain the gateway.
  • It connects to the Google's DNS server to obtain the IP address.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.880.05

FIRST VSAPI PATTERN DATE:

19 Mar 2019

VSAPI OPR PATTERN File:

14.881.00

VSAPI OPR PATTERN Date:

20 Mar 2019

Scan your computer with your Trend Micro product to delete files detected as Backdoor.Linux.BASHLITE.SMJC3. 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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