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Trojan.Encoder.33749

Added to the Dr.Web virus database: 2021-04-01

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKLM>\Software\Wow6432Node\Microsoft\Windows\CurrentVersion\Run] 'Machin_Updaters' = 'c:\$Recycle.Bin\RCRU_64.exe'
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Machin_Update' = 'c:\$Recycle.Bin\RCRU_64.exe'
Creates or modifies the following files
  • %APPDATA%\microsoft\windows\start menu\programs\startup\desktopini.exe
Sets the following service settings
  • [<HKLM>\System\CurrentControlSet\Services\IKEEXT] 'Start' = '00000002'
Creates the following files on removable media
  • <Drive name for removable media>:\read_me!_.txt
  • <Drive name for removable media>:\delete.avi
  • <Drive name for removable media>:\join.avi
  • <Drive name for removable media>:\archer.avi
  • <Drive name for removable media>:\tileimage.bmp
  • <Drive name for removable media>:\dialmap.bmp
  • <Drive name for removable media>:\coffee.bmp
  • <Drive name for removable media>:\toolbar.bmp
  • <Drive name for removable media>:\contosoroot.cer
  • <Drive name for removable media>:\contoso_1.cer
  • <Drive name for removable media>:\sdksampleunprivdeveloper.cer
  • <Drive name for removable media>:\testee.cer
  • <Drive name for removable media>:\contoso.cer
  • <Drive name for removable media>:\testcertificate.cer
  • <Drive name for removable media>:\pmd.cer
Malicious functions
To complicate detection of its presence in the operating system,
blocks the following features:
  • User Account Control (UAC)
deletes volume shadow copies.
Executes the following
  • '%WINDIR%\syswow64\netsh.exe' firewall set opmode mode=disable
  • '%WINDIR%\syswow64\taskkill.exe' /im mysqld.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im mysqld-nt.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im mysqld-opt.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im dbeng50.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im sqbcoreservice.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im excel.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im infopath.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im msaccess.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im mspub.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im onenote.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im outlook.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im powerpnt.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im steam.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im thebat.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im thebat64.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im thunderbird.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im visio.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im ocomm.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im winword.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im tbirdconfig.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im encsvc.exe
  • '%WINDIR%\syswow64\netsh.exe' advfirewall firewall set rule group="Network Discovery" new enable=Yes
  • '%WINDIR%\syswow64\taskkill.exe' /im notepad.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im msftesql.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im sqlagent.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im sqlbrowser.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im sqlservr.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im sqlwriter.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im oracle.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im ocssd.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im dbsnmp.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im synctime.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im agntsvc.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im mydesktopqos.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im isqlplussvc.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im xfssvccon.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im mydesktopservice.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im ocautoupds.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im firefoxconfig.exe
  • '%WINDIR%\syswow64\taskkill.exe' /im wordpad.exe
Modifies file system
Creates the following files
  • %HOMEPATH%\appdata\pagesfilo.sys
  • C:\read_me!_.txt
  • D:\read_me!_.txt
  • C:\$recycle.bin\read_me!_.txt
  • C:\$recycle.bin\rcru_64.exe
  • C:\$recycle.bin\s-1-5-21-1960123792-2022915161-3775307078-1001\read_me!_.txt
Modifies the following files
  • D:\install.log
  • <Drive name for removable media>:\delete.avi
  • <Drive name for removable media>:\join.avi
  • <Drive name for removable media>:\archer.avi
  • <Drive name for removable media>:\tileimage.bmp
  • <Drive name for removable media>:\dialmap.bmp
  • <Drive name for removable media>:\coffee.bmp
  • <Drive name for removable media>:\toolbar.bmp
  • <Drive name for removable media>:\contosoroot.cer
  • <Drive name for removable media>:\contoso_1.cer
  • <Drive name for removable media>:\sdksampleunprivdeveloper.cer
  • <Drive name for removable media>:\testee.cer
  • <Drive name for removable media>:\contoso.cer
  • <Drive name for removable media>:\testcertificate.cer
  • <Drive name for removable media>:\pmd.cer
  • <Drive name for removable media>:\uep_form_786_bulletin_1726i602.doc
Network activity
Connects to
  • '12#.#3.179.200':8080
UDP
  • DNS ASK re#####r1.opendns.com
  • DNS ASK 22#.###.67.208.in-addr.arpa
  • DNS ASK my##.#pendns.com
Miscellaneous
Searches for the following windows
  • ClassName: '' WindowName: ''
Executes the following
  • '%WINDIR%\syswow64\cmd.exe' /c reg.exe ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f&vssadmin.exe Delete Shadows /All /Quiet&wmic shadowcopy delete&netsh advfirewall ...
  • '%WINDIR%\syswow64\reg.exe' ADD HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System /v EnableLUA /t REG_DWORD /d 0 /f
  • '%WINDIR%\syswow64\netsh.exe' advfirewall set currentprofile state off
  • '%WINDIR%\syswow64\cmd.exe' /c taskkill /im notepad.exe&taskkill /im msftesql.exe&taskkill /im sqlagent.exe&taskkill /im sqlbrowser.exe&taskkill /im sqlservr.exe&taskkill /im sqlwriter.exe&taskkill /im oracle.exe&taskkill...
  • '%WINDIR%\syswow64\cmd.exe' /c echo %date%-%time%
  • '%WINDIR%\syswow64\cmd.exe' /c ver
  • '%WINDIR%\syswow64\cmd.exe' /c nslookup myip.opendns.com. resolver1.opendns.com
  • '%WINDIR%\syswow64\nslookup.exe' myip.opendns.com. resolver1.opendns.com
  • '%WINDIR%\syswow64\cmd.exe' /c reg delete HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /v Machin_Update /f&reg delete HKLM\Software\Microsoft\Windows\CurrentVersion\Run /v Machin_Update /f
  • '%WINDIR%\syswow64\reg.exe' delete HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /v Machin_Update /f
  • '%WINDIR%\syswow64\reg.exe' delete HKLM\Software\Microsoft\Windows\CurrentVersion\Run /v Machin_Update /f
  • '%WINDIR%\syswow64\cmd.exe' /c reg add HKLM\Software\Microsoft\Windows\CurrentVersion\Run /v Machin_Updaters /t REG_SZ /d c:\$Recycle.Bin\RCRU_64.exe /f&reg add HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\...
  • '%WINDIR%\syswow64\reg.exe' add HKLM\Software\Microsoft\Windows\CurrentVersion\Run /v Machin_Updaters /t REG_SZ /d c:\$Recycle.Bin\RCRU_64.exe /f
  • '%WINDIR%\syswow64\reg.exe' add HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Run /v Machin_Update /t REG_SZ /d c:\$Recycle.Bin\RCRU_64.exe /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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  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

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