Ransom.Win32.NOESCAPE.B


 ALIASES:

Win32/Disabler.NDL trojan (NOD32), Trojan.Win32.Disabler (IKARUS)

 PLATFORM:

Windows

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

  • Threat Type: Ransomware

  • Destructiveness: No

  • Encrypted: No

  • In the wild: Yes

  OVERVIEW

Infection Channel:

Dropped by other malware

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.

It executes then deletes itself afterward.

It deletes files in certain folders, disabling programs and applications from properly running.

It drops files as ransom note.

  TECHNICAL DETAILS

File Size:

682,658 bytes

File Type:

EXE

Memory Resident:

Yes

Initial Samples Received Date:

24 Mar 2023

Payload:

Modifies system registry, Displays graphics/image, Drops files, Deletes 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:

  • %ProgramData%\Microsoft\User Account Pictures\user-192.png
  • %ProgramData%\Microsoft\User Account Pictures\user-32.png
  • %ProgramData%\Microsoft\User Account Pictures\user-40.png
  • %ProgramData%\Microsoft\User Account Pictures\user-48.png
  • %ProgramData%\Microsoft\User Account Pictures\user.bmp
  • %ProgramData%\Microsoft\User Account Pictures\user.png
  • %AppDataLocal%\noescape.png

(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit) and XP.. %AppDataLocal% is the Local Application Data folder, which is usually C:\Documents and Settings\{user name}\Local Settings\Application Data on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\AppData\Local on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).)

It drops the following copies of itself into the affected system:

  • %Windows%\winnt32.exe

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

It executes then deletes itself afterward.

It adds the following mutexes to ensure that only one of its copies runs at any one time:

  • Mutex Name: processLimit

Autostart Technique

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

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
Userinit = %System%\userinit.exe, %Windows%\winnt32.exe

HKEY_CLASSES_ROOT\exefile\SHELL\
runas\command
(Default) = %Windows%\winnt32.exe "%1" %*

HKEY_CLASSES_ROOT\exefile\SHELL\
OPEN\command
(Default) = %Windows%\winnt32.exe "%1" %*

Other System Modifications

This Ransomware deletes files in the following folders:

  • %ProgramData%\Microsoft\User Account Pictures
  • %Desktop%
  • %Public%\Desktop

(Note: %ProgramData% is a version of the Program Files folder where any user on a multi-user computer can make changes to programs. This contains application data for all users. This is usually C:\ProgramData on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit), or C:\Documents and Settings\All Users on Windows Server 2003(32-bit), 2000(32-bit) and XP.. %Desktop% is the current user's desktop, which is usually C:\Documents and Settings\{User Name}\Desktop on Windows 2000(32-bit), XP, and Server 2003(32-bit), or C:\Users\{user name}\Desktop on Windows Vista, 7, 8, 8.1, 2008(64-bit), 2012(64-bit) and 10(64-bit).. %Public% is the folder that serves as a repository of files or folders common to all users, which is usually C:\Users\Public in Windows Vista, 7, and 8.)

It modifies the following registry keys:

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
AutoAdminLogon = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
shutdownwithoutlogon = 0

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
Explorer
UseDefaultTile = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Policies\
Windows\System
DisableLogonBackgroundImage = 1

HKEY_CURRENT_USER\Control Panel\Mouse
SwapMouseButtons = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
EnableLUA = 0

HKEY_CURRENT_USER\SOFTWARE\Microsoft\
Windows\CurrentVersion\Policies\
System
DisableRegistryTools = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
DisableCAD = 1

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\
Windows NT\CurrentVersion\Winlogon
AutoRestartShell = 0

HKEY_CURRENT_USER\Control Panel\Desktop
AutoColorization = 1

HKEY_CURRENT_USER\SOFTWARE\Policies\
Microsoft\Windows\System
DisableCMD = 2

HKEY_LOCAL_MACHINE\System\CurrentControlSet\
Control\Keyboard Layout
Scancode Map = {disabled all keys except: e, t, y, o, a, s, d, h, space, enter}

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

HKEY_CURRENT_USER\Control Panel\Desktop
Wallpaper = %AppDataLocal%\noescape.png

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

  • %AppDataLocal%\noescape.png

Other Details

This Ransomware does the following:

  • Add local accounts to the local group:
    • Administrator
    • Users
  • Create accounts in local group Administrator with a random symbols as username.
  • Change the name of the current username to:
    • NO ESCAPE
  • Change the password of the current user to:
    • death
  • It only executes or run in Windows NT 10.0 OS.
  • Prompts an error message box if not executed in Windows NT 10.0
  • Disable Ctrl+Alt+Del security sequence
  • Disable shutdown button
  • Disable Sign-in Screen Background Image
  • Disable some keyboard keys
  • Swap mouse button
  • Disables User Account Control
  • Disable Window registry editor
  • Disable Command Prompt
  • Change wallpaper
  • Disable auto restart when interface or components failed
  • Automatically pick a color from desktop background colors
  • Enable automatic logon
  • Restart the infected machine after execution

Ransomware Routine

This Ransomware drops the following file(s) as ransom note:

  • %Public%\Desktop\{random symbols}

  SOLUTION

Minimum Scan Engine:

9.800

FIRST VSAPI PATTERN FILE:

18.340.05

FIRST VSAPI PATTERN DATE:

24 Mar 2023

VSAPI OPR PATTERN File:

18.341.00

VSAPI OPR PATTERN Date:

25 Mar 2023

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:

     
    • Ransom.Win32.TRX.XXPE50FFF066

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 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\Policies\Microsoft\Windows\System
    • DisableCMD = 2
  • In HKEY_LOCAL_MACHINE\System\CurrentControlSet\Control\Keyboard Layout
    • Scancode Map ={disabled all keys except: e, t, y, o, a, s, d, h, space, enter}

Step 6

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 NT\CurrentVersion\Winlogon
    • AutoAdminLogon = 1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
    • shutdownwithoutlogon = 0
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer
    • UseDefaultTile = 1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Windows\System
    • DisableLogonBackgroundImage = 1
  • In HKEY_CURRENT_USER\Control Panel\Mouse
    • SwapMouseButtons = 1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
    • EnableLUA = 0
  • In HKEY_CURRENT_USER\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System
    • DisableRegistryTools = 1
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • DisableCAD = 1
  • In HKEY_CURRENT_USER\Control Panel\Desktop
    • Wallpaper = %AppDataLocal%\noescape.png
  • In HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon
    • AutoRestartShell = 0
  • In HKEY_CURRENT_USER\Control Panel\Desktop
    • AutoColorization = 1

Step 7

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.
  • %ProgramData%\Microsoft\User Account Pictures\user-192.png
  • %ProgramData%\Microsoft\User Account Pictures\user-32.png
  • %ProgramData%\Microsoft\User Account Pictures\user-40.png
  • %ProgramData%\Microsoft\User Account Pictures\user-48.png
  • %ProgramData%\Microsoft\User Account Pictures\user.bmp
  • %ProgramData%\Microsoft\User Account Pictures\user.png
  • %AppDataLocal%\noescape.png
  • %Windows%\winnt32.exe
  • %Public%\Desktop\{random symbols}

Step 8

Restart in normal mode and scan your computer with your Trend Micro product for files detected as Ransom.Win32.NOESCAPE.B. 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 9

Reset your Desktop properties

[ Learn More ]

Step 10

Restore this file from backup only Microsoft-related files will be restored. If this malware/grayware also deleted files related to programs that are not from Microsoft, please reinstall those programs on you computer again.


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