Analysis by: Thea Patrice Tajonera
ALIASES:

N/A

 PLATFORM:

Windows

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

  • Threat Type: Worm

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Propagates via email

This Worm 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: 489,984 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 06 Apr 2021
Payload: Steals information

Arrival Details

This Worm 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 Worm drops the following files:

  • {Malware Path}\{5 Random Characters}

Information Theft

This Worm gathers the following data:

  • OS Version
  • Outlook Account Information
  • Outlook Version
  • Outlook Bitness Version

Other Details

This Worm does the following:

  • This worm checks if Microsoft Outlook is running and installed on the affected machine
  • It composes email messages based on the parameters and sends them to the addresses of the affected user's Microsoft Outlook contact list
    • It accepts the following parameters:
      • type
      • send_to_all
      • additional_emails
      • client_connection_id
      • message_attach
      • attach_type
      • attach_name
      • attach_data_base64
      • email
      • subject
      • content
      • id_string
  • The attachment type could be any of the following file extensions:
    • .z
    • .zip
    • .zoo
    • .arc
    • .lzh
    • .tgz
  • This worm deletes itself if it has successfully sent emails

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 16.644.08
FIRST VSAPI PATTERN DATE: 08 Apr 2021
VSAPI OPR PATTERN File: 16.645.00
VSAPI OPR PATTERN Date: 09 Apr 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

Identify and terminate files detected as Worm.Win64.GOPHE.A

[ Learn More ]
  1. Windows Task Manager may not display all running processes. In this case, please use a third-party process viewer, preferably Process Explorer, to terminate the malware/grayware/spyware file. You may download the said tool here.
  2. If the detected file is displayed in either Windows Task Manager or Process Explorer but you cannot delete it, restart your computer in safe mode. To do this, refer to this link for the complete steps.
  3. If the detected file is not displayed in either Windows Task Manager or Process Explorer, continue doing the next steps.

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.  
  • {Malware Path}\{5 Random Characters}

Step 4

Scan your computer with your Trend Micro product to delete files detected as Worm.Win64.GOPHE.A. 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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