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Trojan.Encoder.41389
Added to the Dr.Web virus database:
2024-12-22
Virus description added:
2024-12-24
Technical Information
To ensure autorun and distribution
Modifies the following registry keys
[HKLM\Software\Classes\BlackBit\shell\open\command] '' = '%ALLUSERSPROFILE%\ybrq21p2.exe "%l" '
Creates or modifies the following files
%APPDATA%\microsoft\windows\start menu\programs\startup\winlogon.exe
%APPDATA%\microsoft\windows\start menu\programs\startup\wvtymcow.bat
<SYSTEM32>\tasks\blackbit
Sets the following service settings
[HKLM\System\CurrentControlSet\Services\IKEEXT] 'Start' = '00000002'
Creates the following files on removable media
<Drive name for removable media>:\cpriv.blackbit
<Drive name for removable media>:\restore-my-files.txt
<Drive name for removable media>:\split.avi
Malicious functions
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
deletes volume shadow copies.
Executes the following
'%WINDIR%\syswow64\netsh.exe' advfirewall set currentprofile state off
'%WINDIR%\syswow64\netsh.exe' firewall set opmode mode=disable
Reads files which store third party applications passwords
%HOMEPATH%\desktop\advice_process.htm
%HOMEPATH%\desktop\contosoroot.cer
%HOMEPATH%\desktop\contosoroot_1.cer
%HOMEPATH%\desktop\contoso_1.cer
%HOMEPATH%\desktop\correct.avi
%HOMEPATH%\desktop\dashborder_192.bmp
%HOMEPATH%\desktop\hadac_newsletter_july_2010_final.docx
%HOMEPATH%\desktop\hanni_umami_chapter.doc
%HOMEPATH%\desktop\nwfieldnotes1966.docx
%HOMEPATH%\desktop\ovp25012015.doc
%HOMEPATH%\desktop\sdkfailsafeemulator.cer
%HOMEPATH%\desktop\sdszfo.docx
%HOMEPATH%\desktop\tileimage.bmp
%HOMEPATH%\desktop\toolbar.bmp
%HOMEPATH%\desktop\uep_form_786_bulletin_1726i602.doc
Modifies file system
Creates the following files
Sets the 'hidden' attribute to the following files
%APPDATA%\winlogon.exe
%ALLUSERSPROFILE%\winlogon.exe
%WINDIR%\winlogon.exe
%ALLUSERSPROFILE%\ybrq21p2.exe
Deletes the following files
%TEMP%\res1c5.tmp
%ALLUSERSPROFILE%\csc1b5.tmp
%TEMP%\odneqw5s.0.cs
%TEMP%\odneqw5s.out
%TEMP%\odneqw5s.cmdline
Modifies the following files
<Drive name for removable media>:\split.avi
C:\users\public\pictures\sample pictures\hydrangeas.jpg
C:\users\public\pictures\sample pictures\desktop.ini
C:\users\public\pictures\sample pictures\desert.jpg
C:\users\public\pictures\sample pictures\chrysanthemum.jpg
C:\users\public\pictures\desktop.ini
C:\users\public\music\sample music\sleep away.mp3
C:\users\public\music\sample music\maid with the flaxen hair.mp3
C:\users\public\music\sample music\kalimba.mp3
C:\users\public\music\sample music\desktop.ini
C:\users\public\music\desktop.ini
C:\users\public\libraries\recordedtv.library-ms
C:\users\public\libraries\desktop.ini
C:\users\public\downloads\desktop.ini
C:\users\public\documents\desktop.ini
C:\users\public\desktop\steam.lnk
C:\users\public\desktop\opera.lnk
C:\users\public\desktop\mozilla thunderbird.lnk
C:\users\public\desktop\firefox.lnk
C:\users\public\desktop\desktop.ini
C:\users\public\desktop\acrobat reader dc.lnk
C:\users\default\ntuser.dat{016888bd-6c6f-11de-8d1d-001e0bcde3ec}.tmcontainer00000000000000000002.regtrans-ms
C:\users\default\ntuser.dat{016888bd-6c6f-11de-8d1d-001e0bcde3ec}.tmcontainer00000000000000000001.regtrans-ms
C:\users\default\ntuser.dat{016888bd-6c6f-11de-8d1d-001e0bcde3ec}.tm.blf
C:\users\default\ntuser.dat.log2
C:\users\default\ntuser.dat.log1
C:\users\default\ntuser.dat.log
C:\users\default\ntuser.dat
C:\users\public\pictures\sample pictures\jellyfish.jpg
C:\users\public\pictures\sample pictures\koala.jpg
Modifies multiple files.
Modifies user data files (Trojan.Encoder).
Network activity
Connects to
'<LOCALNET>.5.1':445
'<LOCALNET>.5.1':139
'62.##3.61.53':80
UDP
'localhost':49937
'localhost':63361
Miscellaneous
Executes the following
'%WINDIR%\syswow64\cmd.exe' /C schtasks /CREATE /SC ONLOGON /TN BlackBit /TR %APPDATA%\winlogon.exe /RU SYSTEM /RL HIGHEST /F
'%WINDIR%\syswow64\cmd.exe' /C netsh advfirewall set currentprofile state off
'%WINDIR%\syswow64\cmd.exe' /C bcdedit /set {default} recoveryenabled no
'%WINDIR%\syswow64\cmd.exe' /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
'%WINDIR%\syswow64\cmd.exe' /C wbadmin delete catalog -quiet
'%WINDIR%\syswow64\cmd.exe' /C vssadmin delete shadows /all /quiet
'%WINDIR%\syswow64\cmd.exe' /C netsh firewall set opmode mode=disable
'%WINDIR%\syswow64\cmd.exe' /C wmic shadowcopy delete
'%WINDIR%\microsoft.net\framework\v4.0.30319\cvtres.exe' /NOLOGO /READONLY /MACHINE:IX86 "/OUT:%TEMP%\RES1C5.tmp" "%ALLUSERSPROFILE%\CSC1B5.tmp"
'%WINDIR%\microsoft.net\framework\v4.0.30319\csc.exe' /noconfig /fullpaths @"%TEMP%\odneqw5s.cmdline"
'%WINDIR%\syswow64\schtasks.exe' /CREATE /SC ONLOGON /TN BlackBit /TR %APPDATA%\winlogon.exe /RU SYSTEM /RL HIGHEST /F
'%WINDIR%\syswow64\cmd.exe' /C wbadmin DELETE SYSTEMSTATEBACKUP
'%WINDIR%\syswow64\cmd.exe' /C schtasks /CREATE /SC ONLOGON /TN BlackBit /TR %APPDATA%\winlogon.exe /RU SYSTEM /RL HIGHEST /F' (with hidden window)
'%WINDIR%\syswow64\cmd.exe' /C netsh advfirewall set currentprofile state off' (with hidden window)
'%WINDIR%\syswow64\cmd.exe' /C vssadmin delete shadows /all /quiet' (with hidden window)
'%WINDIR%\microsoft.net\framework\v4.0.30319\cvtres.exe' /NOLOGO /READONLY /MACHINE:IX86 "/OUT:%TEMP%\RES1C5.tmp" "%ALLUSERSPROFILE%\CSC1B5.tmp"' (with hidden window)
'%WINDIR%\syswow64\cmd.exe' /C wbadmin DELETE SYSTEMSTATEBACKUP' (with hidden window)
'%WINDIR%\syswow64\cmd.exe' /C wmic shadowcopy delete' (with hidden window)
'%WINDIR%\microsoft.net\framework\v4.0.30319\csc.exe' /noconfig /fullpaths @"%TEMP%\odneqw5s.cmdline"' (with hidden window)
'%WINDIR%\syswow64\cmd.exe' /C wbadmin delete catalog -quiet' (with hidden window)
'%WINDIR%\syswow64\cmd.exe' /C bcdedit /set {default} bootstatuspolicy ignoreallfailures' (with hidden window)
'%WINDIR%\syswow64\cmd.exe' /C bcdedit /set {default} recoveryenabled no' (with hidden window)
'%WINDIR%\syswow64\cmd.exe' /C netsh firewall set opmode mode=disable' (with hidden window)
Curing recommendations
Windows
macOS
Linux
Android
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 .
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.
Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.
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.
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.
Find out more about Dr.Web for Android
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