Analysis by: Earle Maui Earnshaw
ALIASES:

Riskware/Diztakun (Fortinet)

 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted:

  • In the wild: Yes

  OVERVIEW

Infection Channel: Dropped by other malware, Downloaded from the Internet

This Ransomware 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: 884,486 bytes
File Type: , EXE
Memory Resident: Yes
Initial Samples Received Date: 15 Apr 2020
Payload: Deletes files, Displays graphics/image, Displays message/message boxes, Encrypts files

Arrival Details

This Ransomware 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 Ransomware drops the following files:

  • %Program Files%\vb\wifi hacker\allwh.reg
  • %Program Files%\vb\wifi hacker\anti.exe
  • %Program Files%\vb\wifi hacker\antiwh.vbs
  • %Program Files%\vb\wifi hacker\bar.vbs
  • %Program Files%\vb\wifi hacker\bara.bat
  • %Program Files%\vb\wifi hacker\diex.bat → terminates explorer.exe
  • %Program Files%\vb\wifi hacker\speakwh.vbs
  • %Program Files%\vb\wifi hacker\wh.bat
  • %Program Files%\vb\wifi hacker\wh.jpg
  • %Program Files%\vb\wifi hacker\wifi.ico
  • %Program Files%\vb\wifi hacker\Uninstall.exe
  • %Program Files%\vb\wifi hacker\Uninstall.ini
  • %User Temp%\$inst\2.tmp
  • %User Temp%\$inst\4.tmp
  • %User Temp%\$inst\5.tmp
  • %System Root%\awh\anti.exe
  • %System Root%\wh\antiwh.vbs
  • %System Root%\wh\diex.bat → terminates explorer.exe
  • %System Root%\wh\speakwh.vbs
  • %System Root%\wh\wh.jpg
  • %System Root%\wh\dcc.bat
  • %System Root%\wh\diebs.bat
  • %System Root%\wh\wh.ico

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

It adds the following processes:

  • cmd /c "%Program Files%\vb\wifi hacker\wh.bat"
  • %Program Files%\vb\wifi hacker\bar.vbs
  • %Program Files%\vb\wifi hacker\bara.bat
  • shutdown -l

(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).)

It creates the following folders:

  • %System Root%\wh
  • %System Root%\awh

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

Autostart Technique

This Ransomware adds the following registry entries to enable its automatic execution at every system startup:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
r = %System Root%\wh\speakwh.vbs

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
o = %System Root%\wh\antiwh.vbs

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Run
t = %System Root%\wh\diex.bat

Other System Modifications

This Ransomware deletes the following files:

  • %Program Files%\vb\wifi hacker\allwh.re
  • %Program Files%\vb\wifi hacker\antiwh.v
  • %Program Files%\vb\wifi hacker\bar.vbs
  • %Program Files%\vb\wifi hacker\rytwh.vb
  • %Program Files%\vb\wifi hacker\speakwh.
  • %Program Files%\vb\wifi hacker\wh.bat
  • %Program Files%\vb\wifi hacker\diex.bat
  • %Program Files%\vb\wifi hacker\diebs.ba
  • %Program Files%\vb\wifi hacker\anti.exe
  • %Program Files%\vb\wifi hacker\wh.jpg
  • %Program Files%\vb\wifi hacker\wifi.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).)

It deletes the following folders:

  • %User Temp%\$inst

(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).)

It adds the following registry entries as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
StartMenuLogOff = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoDrives = 67108863

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoClose = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
HideClock = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoViewContext = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoStartMenuPinnedList = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoStartMenuMorePrograms = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoDesktop = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NocontrolPanel = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoRun = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
NoWinkeys = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
disabletaskmgr = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System
disableregistrytools = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
DisplayName = wifi hacker 1.00

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
DisplayVersion = 1.00

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
VersionMajor = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
VersionMinor = 0

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
Publisher = vb

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
DisplayIcon = %Program Files%\vb\wifi hacker\Uninstall.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
UninstallString = %Program Files%\vb\wifi hacker\Uninstall.exe

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
URLInfoAbout = systemdestroyer0108@{BLOCKED}l.com

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
HelpLink = systemdestroyer0108@{BLOCKED}l.com

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
InstallLocation = %Program Files%\vb\wifi hacker

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
InstallSource = {Malware Path}

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
InstallDate = {Malware Execution Date} - (Format {year}{month}{day})

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
Language = 1033

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
EstimatedSize = 1036

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
NoModify = 1

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00
NoRepair = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Explorer
GlobalAssocChangedCounter = 24

It adds the following registry keys as part of its installation routine:

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Policies\
System

HKEY_CURRENT_USER\Software\Microsoft\
Windows\CurrentVersion\Uninstall\
wifi hacker 1.00

It modifies the following registry entries:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
legalnoticecaption = you are infected of corona virus..

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
legalnoticetext = computertricks2018@{BLOCKED}l.com

It changes the desktop wallpaper by modifying the following registry entries:

HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = %System Root%\wh\wh.jpg

It sets the system's desktop wallpaper to the following image:

Other Details

This Ransomware sets the attributes of the following file(s) to Hidden and System:

  • Found in the folder, %System Root%\wh

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

It does the following:

  • Displays the following message upon restart:
  • Make use of windows speech feature to speak “corona virus” in loop

  SOLUTION

Minimum Scan Engine: 9.850
FIRST VSAPI PATTERN FILE: 15.808.04
FIRST VSAPI PATTERN DATE: 16 Apr 2020
VSAPI OPR PATTERN File: 15.809.00
VSAPI OPR PATTERN Date: 17 Apr 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

Restart in Safe Mode

[ Learn More ]

Step 4

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\Microsoft\Windows\CurrentVersion\Run
    • r = "%System Root%\wh\speakwh.vbs"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • o = "%System Root%\wh\antiwh.vbs"
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run
    • t = "%System Root%\wh\diex.bat"

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.

  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
  • HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00

Step 6

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\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • StartMenuLogOff = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • NoDrives = 67108863
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • NoClose = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • HideClock = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • NoViewContext = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • NoStartMenuPinnedList = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • NoStartMenuMorePrograms = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • NoDesktop = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • NocontrolPanel = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • NoRun = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • NoWinkeys = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
    • disabletaskmgr = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Policies\System
    • disableregistrytools = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • DisplayName = wifi hacker 1.00
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • DisplayVersion = 1.00
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • VersionMajor = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • VersionMinor = 0
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • Publisher = vb
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • DisplayIcon = C:\Program Files\vb\wifi hacker\Uninstall.exe
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • UninstallString = %Program Files%\vb\wifi hacker\Uninstall.exe
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • URLInfoAbout = systemdestroyer0108@{BLOCKED}l.com
  • In  HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • HelpLink = systemdestroyer0108@{BLOCKED}l.com
  • In  HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • InstallLocation = %Program Files%\vb\wifi hacker
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • InstallSource = {Malware Path}
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • InstallDate = {Malware Execution Date} - (Format {year}{month}{day})
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • Language = 1033
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • EstimatedSize = 1036
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • NoModify = 1
  • In HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Uninstall\wifi hacker 1.00
    • NoRepair = 1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer
    • GlobalAssocChangedCounter = 24

Step 7

Restore these modified registry values

[ Learn More ]

Important:Editing the Windows Registry incorrectly can lead to irreversible system malfunction. Please do this only if you know how to or you can seek your system administrator's help. You may also check out this Microsoft article first before modifying your computer's registry.

  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
    • legalnoticecaption = From: "you are infected of corona virus.." To: {Default}
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
    • legalnoticetext = From: "computertricks2018@{BLOCKED}l.com" To: {Default}

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 Root%\awh\anti.exe
  • %System Root%\wh\antiwh.vbs
  • %System Root%\wh\diex.bat
  • %System Root%\wh\speakwh.vbs
  • %System Root%\wh\wh.jpg
  • %System Root%\wh\dcc.bat
  • %System Root%\wh\diebs.bat
  • %System Root%\wh\wh.ico
  • %Program Files%\vb\wifi hacker\wifi.ico
  • %Program Files%\vb\wifi hacker\Uninstall.exe
  • %Program Files%\vb\wifi hacker\Uninstall.ini

Step 9

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.Win32.ONALOCKER.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.

Step 10

Reset your Desktop properties

[ Learn More ]


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