Modified by: Clive Fuentebella
ALIASES:

a variant of Win32/2345.H potentially unwanted application (NOD32)

 PLATFORM:

Windows

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

  • Threat Type: Potentially Unwanted Application

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel: Downloaded from the Internet

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

It connects to certain websites to send and receive information.

  TECHNICAL DETAILS

File Size: 1,157,440 bytes
File Type: EXE
Memory Resident: No
Initial Samples Received Date: 11 Jun 2020
Payload: Connects to URLs/IPs

Arrival Details

This Potentially Unwanted Application 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 Potentially Unwanted Application drops the following files:

  • %Application Data%\Helper_2345\temp\download\0\Helper_2345.NewVersion.data
  • %Application Data%\Helper_2345\temp\Helper_2345.CheckVersion.data
  • %Application Data%\Helper_2345\Statistics\helper_statistic.lock
  • %Application Data%\Helper_2345\Statistics\helper_statistic
  • %Application Data%\Helper_2345\Statistics\helper_statistic.time

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other System Modifications

This Potentially Unwanted Application adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\2345.com
UUID = {Generated ID} {Random number}

HKEY_CURRENT_USER\Software\2345.com\
Helper_2345
LADValue = {Random number} {Random number}

HKEY_CURRENT_USER\Software\2345.com\
Helper_2345
ADValue = {Random number} {Random number}

Download Routine

This Potentially Unwanted Application saves the files it downloads using the following names:

  • %Application Data%\Helper_2345\temp\download\0\HelperMain4.5.0.1589.dat

(Note: %Application Data% is the current user's Application Data folder, which is usually C:\Documents and Settings\{user name}\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Roaming on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other Details

This Potentially Unwanted Application connects to the following website to send and receive information:

  • http://update.helper.{BLOCKED}5.cc/ie/index.php
  • http://t.helper.{BLOCKED}5.cc/helper/helper.php

It does the following:

  • It connects to the following URL to download a file:
    • http://helper.{BLOCKED}dn.net/2345helper/HelperMain4.5.0.1589.dat

  SOLUTION

Minimum Scan Engine: 9.850
SSAPI PATTERN File: 2.301.00
SSAPI PATTERN Date: 18 Jun 2020

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

Delete this 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\2345.com
    • UUID = {Generated ID} {Random number}
  • In HKEY_CURRENT_USER\Software\2345.com\Helper_2345
    • LADValue = {Random number} {Random number}
  • In HKEY_CURRENT_USER\Software\2345.com\Helper_2345
    • ADValue = {Random number} {Random number}

Step 4

Search and delete this file

[ 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.
  • %Application Data%\Helper_2345\temp\download\0\Helper_2345.NewVersion.data
  • %Application Data%\Helper_2345\temp\Helper_2345.CheckVersion.data
  • %Application Data%\Helper_2345\Statistics\helper_statistic.lock
  • %Application Data%\Helper_2345\Statistics\helper_statistic
  • %Application Data%\Helper_2345\Statistics\helper_statistic.time
  • %Application Data%\Helper_2345\temp\download\0\HelperMain4.5.0.1589.dat

Step 5

Scan your computer with your Trend Micro product to delete files detected as PUA.Win32.2345Soft.JCH. 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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