Analysis by: Patrick Angelo Roderno
 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. It may be downloaded by other malware/grayware from remote sites.

  TECHNICAL DETAILS

File Size: 1,929,488 bytes
File Type: ELF
File Compression: UPX
Memory Resident: No
Initial Samples Received Date: 12 Apr 2019
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.

It may be downloaded by the following malware/grayware from remote sites:

Other Details

This Trojan does the following:

  • Checks connection to the download URL http://{BLOCKED}.{BLOCKED}.42.229:8667/6HqJB0SPQqbFbHJD. If connection fails, it updates the download URL then proceeds to connect to it to download a copy of the dropper component (detected as Trojan.SH.MALXMR.UWEJJ).
  • Checks if the miner component (detected as Coinminer.Linux.MALXMR.UWEJJ) is running in the system. If not, it checks for its existence in the machine. It executes the miner if found. Otherwise, it downloads the miner from the URL and executes it.
  • Checks if the scanner component (detected as HackTool.Linux.ExploitScan.AA) is running in the system. If not, it checks for its existence in the machine. It executes the scanner if found. Otherwise, it downloads the scanner from the URL and executes it.
  • It lists its crontab tasks to check if the dropper component is being run via cron job. If not found, it creates the following cron job to enable automatic execution of the dropper component:
    • Path: /var/spool/cron/crontab/root
      Trigger: Every 10 minutes
      Action: */10 * * * * sh {dropper component} >/dev/null 2>&1

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.110.06
FIRST VSAPI PATTERN DATE: 14 May 2019
VSAPI OPR PATTERN File: 15.111.00
VSAPI OPR PATTERN Date: 15 May 2019

Scan your computer with your Trend Micro product to delete files detected as Trojan.Linux.WATCHGO.AA. 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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