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Trojan.Win32.LEMONDUCK.I

February 22, 2021
 Modified by: Joshua Paul Ignacio
 ALIASES:

N/A

 PLATFORM:

Windows

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

  • Threat Type: Trojan

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW


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 executes then deletes itself afterward.

  TECHNICAL DETAILS

File Size:

794 bytes

File Type:

Other

Initial Samples Received Date:

21 Feb 2021

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.

Installation

This Trojan adds the following processes:

  • sc stop "Networkcs"
  • sc stop "Networkc"
  • taskkill /f /im systems.exe
  • taskkill /f /im xmrig.exe
  • taskkill /f /im xmxmxmrig.exe
  • svchost.exe install "Networkcsr" r.exe
  • sc config "Networkcsr" DisplayName= "Networkdr"
  • sc description "Networkcsr" "Microsoft Windows Networkcsr"
  • sc start "Networkcsr"
  • svchost.exe install "Networkcsx" x.exe
  • sc config "Networkcsx" DisplayName= "Networkdx"
  • sc description "Networkcsx" "Microsoft Windows Networkcsx"
  • sc start "Networkcsx"
  • attrib +a +s +r +h r.exe
  • attrib +a +s +r +h x.exe
  • attrib +a +s +r +h Windowsdd.exe
  • attrib +a +s +r +h wcry.exe
  • attrib +a +s +r +h config.json

It executes then deletes itself afterward.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

16.552.02

FIRST VSAPI PATTERN DATE:

21 Feb 2021

VSAPI OPR PATTERN File:

16.553.00

VSAPI OPR PATTERN Date:

22 Feb 2021

Step 1

Before doing any scans, Windows 7, Windows 8, Windows 8.1, and Windows 10 users must disable System Restore to allow full scanning of their computers.

Step 2

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win32.LEMONDUCK.I. 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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