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Trojan.Win64.VICERCON.H

March 25, 2025
 Analysis by: Leidryn Saludez
 ALIASES:

Trojan:Win32/DefenseEvasion!rfn (MICROSOFT)

 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:

Downloaded from the Internet, Dropped by other malware


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:

2,750,464 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

26 Jun 2021

Payload:

Collects system information, Connects to URLs/IPs, Steals information

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:

  • %System%\{filename} ← malware copy with different hash
  • %Windows%\SysWow64\{filename} ← malware copy with different hash

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.)

It creates the following folders:

  • %Windows%\Fonts\
  • %Windows%\Fonts\clientdb\
  • %Windows%\Fonts\clientdb\ds\
  • %Windows%\Fonts\clientdb\gt\
  • %Windows%\Fonts\clientdb\MSBuild\
  • %System%\wostmp\
  • %Windows%\SysWow64\wostmp\

(Note: %Windows% is the Windows folder, where it usually is C:\Windows on all Windows operating system versions.. %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.)

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CLASSES_ROOT\SHTinfo
sha1 = {malware defined values}

HKEY_CLASSES_ROOT\SHTinfo
notice = {malware defined values}

HKEY_CLASSES_ROOT\SHTinfo
tunnel = {malware defined values}

HKEY_CLASSES_ROOT\SHTinfo
peer = {malware defined values}

HKEY_CLASSES_ROOT\SHTinfo
staticpeer = {malware defined values}

HKEY_CLASSES_ROOT\SHTinfo
intranet = {hexadecimal values}

HKEY_CLASSES_ROOT\SHTinfo
comment = {hexadecimal values}

HKEY_CLASSES_ROOT\SHTinfo
forward = {hexadecimal values}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SHTinfo
sha1 = {malware defined values}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SHTinfo
notice = {malware defined values}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SHTinfo
tunnel = {malware defined values}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SHTinfo
peer = {malware defined values}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SHTinfo
staticpeer = {malware defined values}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SHTinfo
intranet = {hexadecimal values}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SHTinfo
comment = {hexadecimal values}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SHTinfo
forward = {hexadecimal values}

Information Theft

This Trojan gathers the following data:

  • Computer Name
  • CPU information
  • Username
  • IP Address

Other Details

This Trojan does the following:

  • It moves its own file to:
    • %System%\wostmp\{malware defined values}
    • %Windows%\SysWow64\wostmp\{malware defined values}
  • It uses the following uncommon ports:
    • 27930
  • It searches and gathers data from the following files:
    • C:\1f.txt
    • C:\1i.txt
    • C:\1p.txt
    • D:\1f.txt
    • D:\1i.txt
    • D:\1p.txt
    • E:\1f.txt
    • E:\1i.txt
    • E:\1p.txt
    • %Windows%\1f.txt
    • %Windows%\1i.txt
    • %Windows%\1p.txt
  • It checks the content of its added registries entries.
  • It sends UDP packets to any of the following IP addresses within the network range:
    • {BLOCKED}.{BLOCKED}.248.1 up to {BLOCKED}.{BLOCKED}.248.255
    • {BLOCKED}.{BLOCKED}.39.1 up to {BLOCKED}.{BLOCKED}.39.255
    • {BLOCKED}.{BLOCKED}.246.1 up to {BLOCKED}.{BLOCKED}.246.255
    • {BLOCKED}.{BLOCKED}.4.1 up to (BLOCKED}.{BLOCKED}.4.255
    • {BLOCKED}.{BLOCKED}.37.1 up to {BLOCKED}.{BLOCKED}.37.255
    • {BLOCKED}.{BLOCKED}.202.1 up to {BLOCKED}.{BLOCKED}.202.255
    • {BLOCKED}.{BLOCKED}.93.1 up to {BLOCKED}.{BLOCKED}.93.255
    • {BLOCKED}.{BLOCKED}.186.1 up to {BLOCKED}.{BLOCKED}.{BLOCKED}.255
    • {BLOCKED}.{BLOCKED}.81.1 up to {BLOCKED}.{BLOCKED}.81.255
    • {BLOCKED}.{BLOCKED}.21.1 up to {BLOCKED}.{BLOCKED}.21.255
    • {BLOCKED}.{BLOCKED}.39.1 up to {BLOCKED}.{BLOCKED}.39.255
    • {BLOCKED}.{BLOCKED}.73.1 up to {BLOCKED}.{BLOCKED}.73.255
    • {BLOCKED}.{BLOCKED}.109.1 up to {BLOCKED}.{BLOCKED}.109.255
    • {BLOCKED}.{BLOCKED}.30.1 up to {BLOCKED}.{BLOCKED}.30.255
    • {BLOCKED}.{BLOCKED}.201.1 up to {BLOCKED}.{BLOCKED}.201.255
    • {BLOCKED}.{BLOCKED}.6.1 up to {BLOCKED}.{BLOCKED}.6.255
    • {BLOCKED}.{BLOCKED}.27.1 up to {BLOCKED}.{BLOCKED}.27.255
    • {BLOCKED}.{BLOCKED}.198.1 up to {BLOCKED}.{BLOCKED}.198.255
    • {BLOCKED}.{BLOCKED}.137.1 up to {BLOCKED}.{BLOCKED}.137.255
    • {BLOCKED}.{BLOCKED}.139.1 up to {BLOCKED}.{BLOCKED}.139.255
    • {BLOCKED}.{BLOCKED}.184.1 up to {BLOCKED}.{BLOCKED}.184.255
    • {BLOCKED}.{BLOCKED}.203.1 up to {BLOCKED}.{BLOCKED}.203.255
    • {BLOCKED}.{BLOCKED}.17.1 up to {BLOCKED}.{BLOCKED}.17.255
    • {BLOCKED}.{BLOCKED}.128.1 up to {BLOCKED}.{BLOCKED}.128.255
    • {BLOCKED}.{BLOCKED}.100.1 up to {BLOCKED}.{BLOCKED}.100.255
    • {BLOCKED}.{BLOCKED}.231.1 up to {BLOCKED}.{BLOCKED}.231.255
    • {BLOCKED}.{BLOCKED}.51.1 up to {BLOCKED}.{BLOCKED}.51.255
    • {BLOCKED}.{BLOCKED}.15.1 up to {BLOCKED}.{BLOCKED}.15.255
    • {BLOCKED}.{BLOCKED}.166.1 up to {BLOCKED}.{BLOCKED}.166.255
    • {BLOCKED}.{BLOCKED}.1.1 up to {BLOCKED}.{BLOCKED}.1.255
    • {BLOCKED}.{BLOCKED}.145.1 up to {BLOCKED}.{BLOCKED}.145.255
    • {BLOCKED}.{BLOCKED}.33.1 up to {BLOCKED}.{BLOCKED}.33.255
    • {BLOCKED}.{BLOCKED}.83.1 up to {BLOCKED}.{BLOCKED}.83.255
    • {BLOCKED}.{BLOCKED}.123.1 up to {BLOCKED}.{BLOCKED}.123.255
    • {BLOCKED}.{BLOCKED}.58.1 up to {BLOCKED}.{BLOCKED}.58.255
    • {BLOCKED}.{BLOCKED}.6.1 up to {BLOCKED}.{BLOCKED}.6.255
    • {BLOCKED}.{BLOCKED}.213.1 up to {BLOCKED}.{BLOCKED}.213.255
    • {BLOCKED}.{BLOCKED}.33.1 up to {BLOCKED}.{BLOCKED}.33.255
    • {BLOCKED}.{BLOCKED}.168.1 up to {BLOCKED}.{BLOCKED}.168.255
    • {BLOCKED}.{BLOCKED}.189.1 up to {BLOCKED}.{BLOCKED}.189.255
    • {BLOCKED}.{BLOCKED}.189.1 up to {BLOCKED}.{BLOCKED}.189.255
    • {BLOCKED}.{BLOCKED}.125.1 up to {BLOCKED}.{BLOCKED}.125.255
    • {BLOCKED}.{BLOCKED}.121.1 up to {BLOCKED}.{BLOCKED}.121.255
    • {BLOCKED}.{BLOCKED}.131.1 up to {BLOCKED}.{BLOCKED}.131.255
    • {BLOCKED}.{BLOCKED}.194.1 up to {BLOCKED}.{BLOCKED}.194.255
    • {BLOCKED}.{BLOCKED}.93.1 up to {BLOCKED}.{BLOCKED}.93.255
    • {BLOCKED}.{BLOCKED}.112.1 up to {BLOCKED}.{BLOCKED}.112.255
    • {BLOCKED}.{BLOCKED}.218.1 up to {BLOCKED}.{BLOCKED}.218.255
    • {BLOCKED}.{BLOCKED}.152.1 up to {BLOCKED}.{BLOCKED}.152.255
    • {BLOCKED}.{BLOCKED}.128.1 up to {BLOCKED}.{BLOCKED}.128.255
    • {BLOCKED}.{BLOCKED}.235.1 up to {BLOCKED}.{BLOCKED}.235.255
    • {BLOCKED}.{BLOCKED}.12.1 up to {BLOCKED}.{BLOCKED}.12.255
    • {BLOCKED}.{BLOCKED}.0.1 up to {BLOCKED}.{BLOCKED}.0.255
    • {BLOCKED}.{BLOCKED}.31.1 up to {BLOCKED}.{BLOCKED}.31.255
    • {BLOCKED}.{BLOCKED}.56.1 up to {BLOCKED}.{BLOCKED}.56.255
    • {BLOCKED}.{BLOCKED}.127.1 up to {BLOCKED}.{BLOCKED}.127.255
    • {BLOCKED}.{BLOCKED}.34.1 up to {BLOCKED}.{BLOCKED}.34.255
    • {BLOCKED}.{BLOCKED}.16.1 up to {BLOCKED}.{BLOCKED}.16.255
    • {BLOCKED}.{BLOCKED}.168.1 up to {BLOCKED}.{BLOCKED}.168.255
    • {BLOCKED}.{BLOCKED}.80.0 up to {BLOCKED}.{BLOCKED}.97.255
    • {BLOCKED}.{BLOCKED}.5.0 up to {BLOCKED}.{BLOCKED}.15.255
    • {BLOCKED}.{BLOCKED}.190.0 up to {BLOCKED}.{BLOCKED}.255.255
    • {BLOCKED}.{BLOCKED}.25.0 up to {BLOCKED}.{BLOCKED}.50.255
    • {BLOCKED}.{BLOCKED}.1.0 up to {BLOCKED}.{BLOCKED}.25.255
    • {BLOCKED}.{BLOCKED}.210.0 up to {BLOCKED}.{BLOCKED}.250.255
    • {BLOCKED}.{BLOCKED}.1.0 up to {BLOCKED}.{BLOCKED}.26.255
    • {BLOCKED}.{BLOCKED}.252.0 up to {BLOCKED}.{BLOCKED}.255.255
    • {BLOCKED}.{BLOCKED}.140.0 up to {BLOCKED}.{BLOCKED}.165.255
    • {BLOCKED}.{BLOCKED}.60.0 up to {BLOCKED}.{BLOCKED}.90.255
    • {BLOCKED}.{BLOCKED}.90.0 up to {BLOCKED}.{BLOCKED}.115.255
    • {BLOCKED}.{BLOCKED}.85.0 up to {BLOCKED}.{BLOCKED}.120.255
    • {BLOCKED}.{BLOCKED}.60.0 up to {BLOCKED}.{BLOCKED}.85.255
    • {BLOCKED}.{BLOCKED}.50.0 up to {BLOCKED}.{BLOCKED}.60.255
    • {BLOCKED}.{BLOCKED}.140.0 up to {BLOCKED}.{BLOCKED}.165.255
    • {BLOCKED}.{BLOCKED}.150.0 up to {BLOCKED}.{BLOCKED}.175.255
    • {BLOCKED}.{BLOCKED}.140.0 up to {BLOCKED}.{BLOCKED}.165.255
    • {BLOCKED}.{BLOCKED}.40.0 up to {BLOCKED}.{BLOCKED}.65.255
    • {BLOCKED}.{BLOCKED}.185.0 up to {BLOCKED}.{BLOCKED}.210.255
    • {BLOCKED}.{BLOCKED}.100.0 up to {BLOCKED}.{BLOCKED}.110.255
    • {BLOCKED}.{BLOCKED}.230.0 up to {BLOCKED}.{BLOCKED}.255.255
    • {BLOCKED}.{BLOCKED}.200.0 up to {BLOCKED}.{BLOCKED}.225.255
    • {BLOCKED}.{BLOCKED}.90.0 up to {BLOCKED}.{BLOCKED}.115.255
    • {BLOCKED}.{BLOCKED}.185.0 up to {BLOCKED}.{BLOCKED}.200.255
    • {BLOCKED}.{BLOCKED}.5.0 up to {BLOCKED}.{BLOCKED}.15.255
    • {BLOCKED}.{BLOCKED}.120.0 up to {BLOCKED}.{BLOCKED}.150.255
    • {BLOCKED}.{BLOCKED}.211.0 up to {BLOCKED}.{BLOCKED}.240.255
    • {BLOCKED}.{BLOCKED}.85.0 up to {BLOCKED}.{BLOCKED}.100.255
    • {BLOCKED}.{BLOCKED}.35.0 up to {BLOCKED}.{BLOCKED}.75.255
    • {BLOCKED}.{BLOCKED}.50.0 up to {BLOCKED}.{BLOCKED}.60.255
    • {BLOCKED}.{BLOCKED}.70.0 up to {BLOCKED}.{BLOCKED}.85.255
    • {BLOCKED}.{BLOCKED}.20.0 up to {BLOCKED}.{BLOCKED}.38.255
    • {BLOCKED}.{BLOCKED}.180.0 up to {BLOCKED}.{BLOCKED}.200.255
    • {BLOCKED}.{BLOCKED}.140.0 up to {BLOCKED}.{BLOCKED}.165.255
    • {BLOCKED}.{BLOCKED}.90.0 up to {BLOCKED}.{BLOCKED}.110.255
    • {BLOCKED}.{BLOCKED}.145.0 up to {BLOCKED}.{BLOCKED}.175.255
    • {BLOCKED}.{BLOCKED}.220.0 up to {BLOCKED}.{BLOCKED}.220.255
    • {BLOCKED}.{BLOCKED}.230.0 up to {BLOCKED}.{BLOCKED}.255.255
    • {BLOCKED}.{BLOCKED}.40.0 up to {BLOCKED}.{BLOCKED}.60.255
    • {BLOCKED}.{BLOCKED}.185.0 up to {BLOCKED}.{BLOCKED}.200.255
    • {BLOCKED}.{BLOCKED}.1.0 up to {BLOCKED}.{BLOCKED}.20.255
    • {BLOCKED}.{BLOCKED}.65.0 up to {BLOCKED}.{BLOCKED}.75.255
    • {BLOCKED}.{BLOCKED}.210.0 up to {BLOCKED}.{BLOCKED}.240.255
    • {BLOCKED}.{BLOCKED}.75.0 up to {BLOCKED}.{BLOCKED}.90.255
    • {BLOCKED}.{BLOCKED}.150.0 up to {BLOCKED}.{BLOCKED}.175.255
    • {BLOCKED}.{BLOCKED}.1.0 up to {BLOCKED}.{BLOCKED}.15.255.
    • {BLOCKED}.{BLOCKED}.145.0 up to {BLOCKED}.{BLOCKED}.160.255
    • {BLOCKED}.{BLOCKED}.150.0 up to {BLOCKED}.{BLOCKED}.165.255
    • {BLOCKED}.{BLOCKED}.230.0 up to {BLOCKED}.{BLOCKED}.255.255
    • {BLOCKED}.{BLOCKED}.25.0 up to {BLOCKED}.{BLOCKED}.55.255
    • {BLOCKED}.{BLOCKED}.50.0 up to {BLOCKED}.{BLOCKED}.80.255
    • {BLOCKED}.{BLOCKED}.85.0 up to {BLOCKED}.{BLOCKED}.115.255
    • {BLOCKED}.{BLOCKED}.10.0 up to {BLOCKED}.{BLOCKED}.30.255
    • {BLOCKED}.{BLOCKED}.155.0 up to {BLOCKED}.{BLOCKED}.175.255
    • {BLOCKED}.{BLOCKED}.165.0 up to {BLOCKED}.{BLOCKED}.185.255
    • {BLOCKED}.{BLOCKED}.230.0 up to {BLOCKED}.{BLOCKED}.255.255
    • {BLOCKED}.{BLOCKED}.85.0 up to {BLOCKED}.{BLOCKED}.105.255
    • {BLOCKED}.{BLOCKED}.110.0 up to {BLOCKED}.{BLOCKED}.130.255
    • {BLOCKED}.{BLOCKED}.180.0 up to {BLOCKED}.{BLOCKED}.210.255
    • {BLOCKED}.{BLOCKED}.155.0 up to {BLOCKED}.{BLOCKED}.180.255
    • {BLOCKED}.{BLOCKED}.60.0 up to {BLOCKED}.{BLOCKED}.70.255
    • {BLOCKED}.{BLOCKED}.155.0 up to {BLOCKED}.{BLOCKED}.180.255
    • {BLOCKED}.{BLOCKED}.152.0 up to {BLOCKED}.{BLOCKED}.175.255
    • {BLOCKED}.{BLOCKED}.130.0 up to {BLOCKED}.{BLOCKED}.165.255
    • {BLOCKED}.{BLOCKED}.210.0 up to {BLOCKED}.{BLOCKED}.245.255
    • {BLOCKED}.{BLOCKED}.220.0 up to {BLOCKED}.{BLOCKED}.255.255
    • {BLOCKED}.{BLOCKED}.1.0 up to {BLOCKED}.{BLOCKED}.25.255
    • {BLOCKED}.{BLOCKED}.170.0 up to {BLOCKED}.{BLOCKED}.180.255
    • {BLOCKED}.{BLOCKED}.40.0 up to {BLOCKED}.{BLOCKED}.70.255
    • {BLOCKED}.{BLOCKED}.45.0 up to {BLOCKED}.{BLOCKED}.65.255
    • {BLOCKED}.{BLOCKED}.25.0 up to {BLOCKED}.{BLOCKED}.50.255
    • {BLOCKED}.{BLOCKED}.190.0 up to {BLOCKED}.{BLOCKED}.200.255
    • {first 3 octets of computer IP Address}:0 up to {first 3 octets of computer IP Address}:255
    • {first 2 octets of computer IP Address}:0:0 up to {first 2 octets of computer IP Address}:255:255

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

20.102.03

FIRST VSAPI PATTERN DATE:

25 Mar 2025

VSAPI OPR PATTERN File:

20.103.00

VSAPI OPR PATTERN Date:

26 Mar 2025

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.XXPE50FFF091

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

Delete this registry key

[ 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_CLASSES_ROOT\SHTinfo
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Classes\SHTinfo

Step 6

Disable this malware service

[ Learn More ]
  • {9 random characters}

Step 7

Search and delete this folder

[ Learn More ]
Please make sure you check the Search Hidden Files and Folders checkbox in the More advanced options option to include all hidden folders in the search result.
  • %Windows%\Fonts\
  • %Windows%\Fonts\clientdb\
  • %Windows%\Fonts\clientdb\ds\
  • %Windows%\Fonts\clientdb\gt\
  • %Windows%\Fonts\clientdb\MSBuild\
  • %System%\wostmp\
  • %Windows%\SysWow64\wostmp\

Step 8

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.
  • %System%\{filename}
  • %Windows%\SysWow64\{filename}
  • %System%\wostmp\{malware defined values}
  • %Windows%\SysWow64\wostmp\{malware defined values}

Step 9

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Trojan.Win64.VICERCON.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 this Knowledge Base page for more information.


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