Analysis by: Jeffrey Francis Bonaobra
ALIASES:

Trojan:O97M/Donoff!MSR (MICROSOFT)

 PLATFORM:

Windows

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

  • Threat Type: Backdoor

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet, Dropped by other malware

This Backdoor 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 commands from a remote malicious user, effectively compromising the affected system.

  TECHNICAL DETAILS

File Size: 29,350 bytes
File Type: DOC, DOCX
Memory Resident: No
Initial Samples Received Date: 02 Jan 2023
Payload: Steals information, Connects to URLs/IPs

Arrival Details

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

Backdoor Routine

This Backdoor executes the following commands from a remote malicious user:

  • Set different timer procedure execution interval
  • Enumerate drives
  • Enumerate files
  • Enumerate directories
  • Upload files and directories
  • Download files
  • Delete files
  • Copy files
  • Execute arbitrary commands

It connects to the following URL(s) to send and receive commands from a remote malicious user:

  • https.//{BLOCKED}na.net/acpx/t.php?t=774b4bcb8d7287d011ac9cb2d7ff2a76659ca82a46e5df7783c9ff011d19b21e17393264b85072391adc0b57f0abea9e&action=show_document&z=1&x=2500

Information Theft

This Backdoor gathers the following data:

  • UUID
  • OS Information
    • Architecture
    • Build
    • Version
  • CPU Information
    • Processor Name
  • GPU Information
    • Video Controller Name
  • Running Processes
  • Memory Information
    • RAM Capacity
    • Storage Capacity
  • User Domain
  • User Name
  • Installed Antivirus Products
  • Retrieved file path of AppVLP.exe

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 18.170.05
FIRST VSAPI PATTERN DATE: 02 Jan 2023
VSAPI OPR PATTERN File: 18.171.00
VSAPI OPR PATTERN Date: 03 Jan 2023

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:

     
    • Downloader.VBA.TRX.XXVBAF01FF037

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

Scan your computer with your Trend Micro product to delete files detected as Backdoor.W97M.EKIPA.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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