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Trojan.Linux.DLOADER.THAOOAAK

October 31, 2018
 Analysis by: Arvin Roi Macaraeg
 PLATFORM:

Linux

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Downloaded from the Internet, Dropped by other malware


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

  TECHNICAL DETAILS

File Size:

8,192 bytes

File Type:

ELF

Memory Resident:

No

Initial Samples Received Date:

25 Oct 2018

Payload:

Connects to URLs/IPs

Arrival Details

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

Download Routine

This Trojan accesses the following websites to download files:

  • https://{BLOCKED}in.com/raw/V7fgvQRT

It saves the files it downloads using the following names:

  • /bin/httpdns

Other Details

This Trojan does the following:

  • Trojan used the following set of commands for the scheduled task:
    • C sed -i '$d' /etc/crontab && echo -e \"\n0 */1 * * * root /bin/sh /bin/httpdns\" >> /etc/crontab
  • The trojan set the downloaded file as scheduled task to run every hour.

NOTES:

The Trojan downloads a file and is saved as "/bin/httpdns" which is executed to connect to a URL "https://{BLOCKED}in.com/raw/gC0QiNsw" containing the bash script. The bash script contains the schedule task and the coinminer itself.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

14.594.04

FIRST VSAPI PATTERN DATE:

29 Oct 2018

VSAPI OPR PATTERN File:

14.595.00

VSAPI OPR PATTERN Date:

30 Oct 2018

Step 1

Before doing any scans, Windows XP, Windows Vista, and Windows 7 users must disable System Restore to allow full scanning of their computers.

Step 2

Note that not all files, folders, and registry keys and entries are installed on your computer during this malware's/spyware's/grayware's execution. This may be due to incomplete installation or other operating system conditions. If you do not find the same files/folders/registry information, please proceed to the next step.

Step 3

Search and delete this file

[ Learn More ]
There may be some files that are hidden. Please make sure you check the Search Hidden Files and Folders checkbox in the "More advanced options" option to include all hidden files and folders in the search result.  
  • /bin/httpdns

Step 4

Scan your computer with your Trend Micro product to delete files detected as Trojan.Linux.DLOADER.THAOOAAK. 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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