Trojan.Win32.VIGORF.WLDD

May 12, 2020
 Modified by: Clive Fuentebella
 ALIASES:

Win32:Malware-gen (AVAST)

 PLATFORM:

Windows

 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:

Dropped by other malware, Downloaded from the Internet

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:

841,728 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

06 May 2020

Payload:

Deletes files, 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.

Installation

This Trojan drops the following files:

  • {Malware file path}/{Date}-Plugin.log (contains encrypted process logs)

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • Plugin
  • AIPlugin_log

Other System Modifications

This Trojan deletes the following files:

  • All .log files in the current folder

Other Details

This Trojan accepts the following parameters:

  • -i - It creates a service:
    • Name: Plugin
      Description: plugins service
      Path: {Malware file name and path}
  • -v - It displays the malware version
  • -u - It uninstalls the service
  • -start - It starts the service
  • -stop - It stops the service
  • -console - It does the following:
    • It creates a registry entry:
      • HKEY_LOCAL_MACHINE\SOFTWARE\IXINNUO
        Version=EC.V.1.1.R
      • HKEY_LOCAL_MACHINE\SOFTWARE\IXINNUO
        Mac={Binary data}
    • It connects to the following URLs to send and receive information:
      • http://upgrade.{BLOCKED}uo.com/contract_sign/client-version/current?version=EC.V.1.1.R&retry=0
      • http://upgrade.{BLOCKED}uo.com/contract_sign/client-version/current?version=
      • http://{BLOCKED}.{BLOCKED}.156.177:9002/version/downloadAddr
    • It adds the following processes:
      • %Program Files%\xyrzsvc.exe -start (if kp-setup and Aisino.Framework.Startup.exe is not found running in the system)
      • %Program Files%\xyrzsvc.exe -stop (if kp-setup and Aisino.Framework.Startup.exe is found running in the system)
    • It drops the following files:
      • %System Root%\Aisinosystem.inf
    • It downloads a slightly modified version of itself based on the URL returned by http://{BLOCKED}.{BLOCKED}.156.177:9002/version/downloadAddr.

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

15.854.06

FIRST VSAPI PATTERN DATE:

07 May 2020

VSAPI OPR PATTERN File:

15.855.00

VSAPI OPR PATTERN Date:

08 May 2020

Step 1

Trend Micro Predictive Machine Learning detects and blocks malware at the first sign of its existence, before it executes on your system. When enabled, your Trend Micro product detects this malware under the following machine learning name:

     
    • Troj.Win32.TRX.XXPE50FFF035

Step 2

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 3

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 4

Restart in Safe Mode

[ Learn More ]

Step 5

Disable this malware service

[ Learn More ]
  • Plugin

Step 6

Delete this registry value

[ Learn More ]

Important: Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this step only if you know how or you can ask assistance from your system administrator. Else, check this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\IXINNUO
    • Version = EC.V.1.1.R
  • In HKEY_LOCAL_MACHINE\SOFTWARE\IXINNUO
    • Mac = {Binary data}

Step 7

Search and delete these files

[ 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.
  • {Malware file path}/{Date}-Plugin.log
  • %System Root%\Aisinosystem.inf

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.Win32.VIGORF.WLDD. 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 this Knowledge Base page for more information.


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