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Trojan.Win64.VICERCON.F

March 25, 2025
 Analysis by: John Rainier Navato
 ALIASES:

Trojan.Win64.Miner.ajht (KASPERSKY)

 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:

487,424 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

05 Dec 2020

Payload:

Drops files, Connects to URLs/IPs

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 creates the following folders:

  • %Windows%\Fonts\clientdb\
  • %Windows%\Fonts\clientdb\ds
  • %Windows%\Fonts\clientdb\gt
  • %Windows%\Fonts\Msbuild

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

Other System Modifications

This Trojan adds the following registry entries:

HKEY_CLASSES_ROOT\SHTinfo
comment = {Hex Values}

HKEY_CURRENT_ROOT\SHTinfo
intranet = {Hex Values}

HKEY_CURRENT_ROOT\SHTinfo
notice = {Hex Values}

HKEY_CURRENT_ROOT\SHTinfo
peer = {Hex Values}

HKEY_CURRENT_ROOT\SHTinfo
tunnel = {Malware Defined Values}

HKEY_CURRENT_ROOT\SHTinfo
sha1 = {Malware Defined Values}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SHTinfo
comment = {Hex Values}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SHTinfo
intranet = {Hex Values}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SHTinfo
notice = {Hex Values}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SHTinfo
peer = {Hex Values}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SHTinfo
tunnel = {Malware Defined Values}

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SHTinfo
sha1 = {Malware Defined Values}

Information Theft

This Trojan gathers the following data:

  • Computer Name
  • Username
  • CPU Information
  • Memory Information:
    • Total physical memory
    • Available physical memory
    • Total virtual memory
    • Available virtual memory
    • Total page file size
    • Available page file size
  • Local Time

Other Details

This Trojan adds the following registry keys:

HKEY_CLASSES_ROOT\SHTinfo

HKEY_LOCAL_MACHINE\SOFTWARE\Classes\
SHTinfo

It does the following:

  • It uses the following uncommon ports:
    • 27930
  • 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
  • It searches and gather data found in the following files:
    • C:\1f.txt
    • C:\1i.txt
    • C:\1p.txt
    • C:\windows\1f.txt
    • C:\windows\1i.txt
    • C:\windows\1p.txt
    • D:\1f.txt
    • D:\1i.txt
    • D:\1p.txt
    • E:\1f.txt
    • E:\1i.txt
    • E:\1p.txt

  SOLUTION

Minimum Scan Engine:

9.850

FIRST VSAPI PATTERN FILE:

19.978.05

FIRST VSAPI PATTERN DATE:

24 Mar 2025

VSAPI OPR PATTERN File:

19.979.00

VSAPI OPR PATTERN Date:

25 Mar 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

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 3

Scan your computer with your Trend Micro product to delete files detected as Trojan.Win64.VICERCON.F. 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:

Step 4

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 5

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\clientdb\ds
  • %Windows%\Fonts\clientdb\gt
  • %Windows%\Fonts\clientdb\
  • %Windows%\Fonts\Msbuild


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