PUA.Win32.WebPhone.A

 Analysis by: Mc Justine De Guzman

 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.

  TECHNICAL DETAILS

File Size:

5,039,424 bytes

File Type:

EXE

Memory Resident:

No

Initial Samples Received Date:

15 Oct 2021

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 adds the following folders:

  • %Program Files%\WebPhone_Service
  • %Program Files%\WebPhone_Service\.install4j
  • %User Profile%\.oracle_jre_usage

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It drops the following files:

  • %User Temp%\i4j_nlog_2
  • %User Profile%\.oracle_jre_usage\f9b9f6b9014e1b80.timestamp
  • %Program Files%\WebPhone_Service\WPIcon.ico
  • %Program Files%\WebPhone_Service\WebPhone_Service.exe
  • %Program Files%\WebPhone_Service\cert.pem
  • %Program Files%\WebPhone_Service\certversion.dat
  • %Program Files%\WebPhone_Service\checkjv.bat
  • %Program Files%\WebPhone_Service\checkjv2.bat
  • %Program Files%\WebPhone_Service\content\native\mediaench.dll
  • %Program Files%\WebPhone_Service\content\native\mediaench2x64.dll
  • %Program Files%\WebPhone_Service\content\native\mediaenchx64.dll
  • %Program Files%\WebPhone_Service\content\native\opx32.dll
  • %Program Files%\WebPhone_Service\content\native\opx64.dll
  • %Program Files%\WebPhone_Service\content\native\ring.wav
  • %Program Files%\WebPhone_Service\content\native\wphoneapp.jar
  • %Program Files%\WebPhone_Service\key.pem
  • %Program Files%\WebPhone_Service\libeay32.dll
  • %Program Files%\WebPhone_Service\license_agrement.txt
  • %Program Files%\WebPhone_Service\micfg.bat
  • %Program Files%\WebPhone_Service\i4j324008600730250760.tmp
  • %Program Files%\WebPhone_Service\mwphone_ns.dat
  • %Program Files%\WebPhone_Service\root.pem
  • %Program Files%\WebPhone_Service\softphonedef.ini
  • %Program Files%\WebPhone_Service\ssleay32.dll
  • %Program Files%\WebPhone_Service\uninstall.exe
  • %Program Files%\WebPhone_Service\unzip.exe
  • %Program Files%\WebPhone_Service\what.txt
  • %Program Files%\WebPhone_Service\wpcert.cer
  • %Program Files%\WebPhone_Service\.install4j\inst_jre.cfg
  • %Program Files%\WebPhone_Service\.install4j\i4jruntime.jar
  • %Program Files%\WebPhone_Service\.install4j\MessagesDefault
  • %Program Files%\WebPhone_Service\.install4j\i4jparams.conf
  • %Program Files%\WebPhone_Service\.install4j\stats.properties
  • %Program Files%\WebPhone_Service\.install4j\user.jar
  • %Program Files%\WebPhone_Service\.install4j\i4jdel.exe
  • %Program Files%\WebPhone_Service\.install4j\i4jinst.dll
  • %Program Files%\WebPhone_Service\.install4j\i4j_extf_0_1jcig0z.utf8
  • %Program Files%\WebPhone_Service\.install4j\i4j_extf_1_1jcig0z_1rthfh6.ico
  • %Program Files%\WebPhone_Service\.install4j\unicows.dll
  • %Program Files%\WebPhone_Service\.install4j\_shfoldr.dll
  • %Program Files%\WebPhone_Service\.install4j\response.varfile
  • %Program Files%\WebPhone_Service\.install4j\install.prop
  • %Program Files%\WebPhone_Service\.install4j\autoUninstall.0
  • %Program Files%\WebPhone_Service\.install4j\files.log
  • %Program Files%\WebPhone_Service\.install4j\installation.log
  • %User Temp%\i4jdel0.exe
  • %User Temp%\i4j5676818038135158873.tmp

(Note: %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %User Profile% is the current user's profile folder, which is usually C:\Documents and Settings\{user name} on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name} on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It adds the following processes:

  • %System%\net.exe stop webphone
  • %System%\net1 stop webphone
  • %System%\taskkill.exe" /IM WebPhone_Service.exe /F
  • %System%\taskkill.exe" /IM "java.exe " /F
  • %System%\taskkill.exe" /IM "javaw.exe " /F
  • %System%\taskkill.exe" /IM jqs.exe /F
  • %System%\taskkill.exe" /IM "jp2launcher.exe " /F
  • netsh advfirewall firewall delete rule name=WebPhone_Service
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceTCP1
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceTCP2
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceTCP3
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceUDP1
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceUDP2
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceUDP3
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceJAVAU
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceJAVAS
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceJAVALB0
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceJAVALB1
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceJAVAB2
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceJAVALV1
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceJAVAV2
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceJAVALV5
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceJAVAV5
  • netsh advfirewall firewall delete rule name=WebPhone_ServiceJAVAV8
  • %System%\cmd.exe /D /C "%User Temp%\i4j{random characters}.bat" -> used to terminate the processes and services

(Note: %System% is the Windows system folder, where it usually is C:\Windows\System32 on all Windows operating system versions.. %User Temp% is the current user's Temp folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Temp on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local\Temp 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:

HKEY_CURRENT_USER\Software\ej-technologies\
exe4j\pids
{Malware full path} = 1664

HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies\
exe4j\priority
Webphone = 32

HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies\
install4j\installations
allinstdirsWebPhone_Service = %Program Files%\WebPhone_Service

HKEY_CURRENT_USER\Software\ej-technologies\
install4j\installations
allinstdirsWebPhone_Service = %Program Files%\WebPhone_Service

HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies\
install4j\installations
instdirWebPhone_Service = %Program Files%\WebPhone_Service

HKEY_CURRENT_USER\Software\ej-technologies\
install4j\installations
instdirWebPhone_Service = %Program Files%\WebPhone_Service

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WebPhone_Service
DisplayName = WebPhone Service Plugin 3.4.21066.155

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WebPhone_Service
DisplayIcon = %Program Files%\WebPhone_Service\.install4j\i4j_extf_1_1jcig0z_1rthfh6.ico

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WebPhone_Service
UninstallString = %Program Files%\WebPhone_Service\uninstall.exe

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WebPhone_Service
Publisher = WebSIPPhone

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WebPhone_Service
URLInfoAbout = www.m{BLOCKED}ip.com

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WebPhone_Service
InstallLocation = %Program Files%\WebPhone_Service

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WebPhone_Service
DisplayVersion = 3.4.21066.155

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WebPhone_Service
VersionMajor = 3

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WebPhone_Servic
VersionMinor = 4

Adware Routine

This Potentially Unwanted Application adds and runs the following services:

  • Service name: Webphone
    • Imagepath: %Program Files%\WebPhone_Service\WebPhone_Service.exe

(Note: %Program Files% is the default Program Files folder, usually C:\Program Files in Windows 2000(32-bit), Server 2003(32-bit), XP, Vista(64-bit), 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit) , or C:\Program Files (x86) in Windows XP(64-bit), Vista(64-bit), 7(64-bit), 8(64-bit), 8.1(64-bit), 2008(64-bit), 2012(64-bit) and 10(64-bit).)

Other Details

This Potentially Unwanted Application adds the following registry keys:

HKEY_CURRENT_USER\Software\ej-technologies

HKEY_CURRENT_USER\Software\ej-technologies\
exe4j

HKEY_CURRENT_USER\Software\ej-technologies\
exe4j\pids

HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies

HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies\
exe4j

HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies\
exe4j\priority

HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies\
install4j

HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies\
install4j\installations

HKEY_CURRENT_USER\Software\ej-technologies\
install4j

HKEY_CURRENT_USER\Software\ej-technologies\
install4j\installations

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Uninstall\
WebPhone_Service

It does the following:

  • It accepts the following parameters:
    • -q -> executes unattended mode
    • -console -> If the installer is executed in unattended mode and -console is passed as a second parameter, status messages will be printed on the console from which the installer was invoked.
    • -splash -> Only valid if -q is set. Instead of being completely quiet in unattended installation mode, a small window with a progress bar and the specified title will be shown to inform the user about the progress of the installer application
    • -c -> executes in console mode
    • -manual -> executes GUI mode
    • -nocheck
  • It creates a semaphore to ensure that only one of its copies runs at any one time:
    • {Malware full path}
  • It creates a batch file at %User Temp%\i4j{random characters}.bat per process or service to be terminated

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

  SOLUTION

Minimum Scan Engine:

9.800

SSAPI PATTERN File:

2.451.00

SSAPI PATTERN Date:

01 Oct 2021

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

Restart in Safe Mode

[ Learn More ]

Step 4

Disable this malware service

[ Learn More ]
    • Service name: Webphone
    • Imagepath: %Program Files%\WebPhone_Service\WebPhone_Service.exe

Step 5

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\ej-technologies\exe4j\pids
    • {Malware full path} = 1664
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies\exe4j\priority
    • Webphone = 32
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies\install4j\installations
    • allinstdirsWebPhone_Service = %Program Files%\WebPhone_Service
  • In HKEY_CURRENT_USER\Software\ej-technologies\install4j\installations
    • allinstdirsWebPhone_Service = %Program Files%\WebPhone_Service
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies\install4j\installations
    • instdirWebPhone_Service = %Program Files%\WebPhone_Service
  • In HKEY_CURRENT_USER\Software\ej-technologies\install4j\installations
    • instdirWebPhone_Service = %Program Files%\WebPhone_Service
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WebPhone_Service
    • DisplayName = WebPhone Service Plugin 3.4.21066.155
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WebPhone_Service
    • DisplayIcon = %Program Files%\WebPhone_Service\.install4j\i4j_extf_1_1jcig0z_1rthfh6.ico
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WebPhone_Service
    • UninstallString = %Program Files%\WebPhone_Service\uninstall.exe
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WebPhone_Service
    • Publisher = WebSIPPhone
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WebPhone_Service
    • URLInfoAbout = www.mizu-voip.com
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WebPhone_Service
    • InstallLocation = %Program Files%\WebPhone_Service
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WebPhone_Service
    • DisplayVersion = 3.4.21066.155
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WebPhone_Service
    • VersionMajor = 3
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WebPhone_Servic
    • VersionMinor = 4

Step 6

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_CURRENT_USER\Software\ej-technologies
    • "" = ""
  • In HKEY_CURRENT_USER\Software\ej-technologies\exe4j
    • "" = ""
  • In HKEY_CURRENT_USER\Software\ej-technologies\exe4j\pids
    • "" = ""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies
    • "" = ""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies\exe4j
    • "" = ""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies\exe4j\priority
    • "" = ""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies\install4j
    • "" = ""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\ej-technologies\install4j\installations
    • "" = ""
  • In HKEY_CURRENT_USER\Software\ej-technologies\install4j
    • "" = ""
  • In HKEY_CURRENT_USER\Software\ej-technologies\install4j\installations
    • "" = ""
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Uninstall\WebPhone_Service
    • "" = ""

Step 7

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.
  • %User Temp%\i4j_nlog_2
  • %User Profile%\.oracle_jre_usage\f9b9f6b9014e1b80.timestamp
  • %Program Files%\WebPhone_Service\WPIcon.ico
  • %Program Files%\WebPhone_Service\WebPhone_Service.exe
  • %Program Files%\WebPhone_Service\cert.pem
  • %Program Files%\WebPhone_Service\certversion.dat
  • %Program Files%\WebPhone_Service\checkjv.bat
  • %Program Files%\WebPhone_Service\checkjv2.bat
  • %Program Files%\WebPhone_Service\content\native\mediaench.dll
  • %Program Files%\WebPhone_Service\content\native\mediaench2x64.dll
  • %Program Files%\WebPhone_Service\content\native\mediaenchx64.dll
  • %Program Files%\WebPhone_Service\content\native\opx32.dll
  • %Program Files%\WebPhone_Service\content\native\opx64.dll
  • %Program Files%\WebPhone_Service\content\native\ring.wav
  • %Program Files%\WebPhone_Service\content\native\wphoneapp.jar
  • %Program Files%\WebPhone_Service\key.pem
  • %Program Files%\WebPhone_Service\libeay32.dll
  • %Program Files%\WebPhone_Service\license_agrement.txt
  • %Program Files%\WebPhone_Service\micfg.bat
  • %Program Files%\WebPhone_Service\i4j324008600730250760.tmp
  • %Program Files%\WebPhone_Service\mwphone_ns.dat
  • %Program Files%\WebPhone_Service\root.pem
  • %Program Files%\WebPhone_Service\softphonedef.ini
  • %Program Files%\WebPhone_Service\ssleay32.dll
  • %Program Files%\WebPhone_Service\uninstall.exe
  • %Program Files%\WebPhone_Service\unzip.exe
  • %Program Files%\WebPhone_Service\what.txt
  • %Program Files%\WebPhone_Service\wpcert.cer
  • %Program Files%\WebPhone_Service\.install4j\inst_jre.cfg
  • %Program Files%\WebPhone_Service\.install4j\i4jruntime.jar
  • %Program Files%\WebPhone_Service\.install4j\MessagesDefault
  • %Program Files%\WebPhone_Service\.install4j\i4jparams.conf
  • %Program Files%\WebPhone_Service\.install4j\stats.properties
  • %Program Files%\WebPhone_Service\.install4j\user.jar
  • %Program Files%\WebPhone_Service\.install4j\i4jdel.exe
  • %Program Files%\WebPhone_Service\.install4j\i4jinst.dll
  • %Program Files%\WebPhone_Service\.install4j\i4j_extf_0_1jcig0z.utf8
  • %Program Files%\WebPhone_Service\.install4j\i4j_extf_1_1jcig0z_1rthfh6.ico
  • %Program Files%\WebPhone_Service\.install4j\unicows.dll
  • %Program Files%\WebPhone_Service\.install4j\_shfoldr.dll
  • %Program Files%\WebPhone_Service\.install4j\response.varfile
  • %Program Files%\WebPhone_Service\.install4j\install.prop
  • %Program Files%\WebPhone_Service\.install4j\autoUninstall.0
  • %Program Files%\WebPhone_Service\.install4j\files.log
  • %Program Files%\WebPhone_Service\.install4j\installation.log
  • %User Temp%\i4jdel0.exe
  • %User Temp%\i4j5676818038135158873.tmp

Step 8

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.
  • %Program Files%\WebPhone_Service
  • %Program Files%\WebPhone_Service\.install4j
  • %User Profile%\.oracle_jre_usage

Step 9

Restart in normal mode and scan your computer with your Trend Micro product for files detected as PUA.Win32.WebPhone.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 this Knowledge Base page for more information.


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