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Trojan.Encoder.33307
Added to the Dr.Web virus database:
2020-12-14
Virus description added:
2020-12-15
Technical Information
To ensure autorun and distribution
Modifies the following registry keys
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'MSFEEditor' = '"<Full path to file>" e'
Creates the following files on removable media
<Drive name for removable media>:\join.avi
<Drive name for removable media>:\applicantform_en.doc
<Drive name for removable media>:\february_catalogue__2015.doc.inprocess
<Drive name for removable media>:\february_catalogue__2015.doc
<Drive name for removable media>:\hanni_umami_chapter.doc.inprocess
<Drive name for removable media>:\hanni_umami_chapter.doc
<Drive name for removable media>:\contoso.cer.inprocess
<Drive name for removable media>:\contoso.cer
<Drive name for removable media>:\pmd.cer.inprocess
<Drive name for removable media>:\pmd.cer
<Drive name for removable media>:\contosoroot.cer.inprocess
<Drive name for removable media>:\contosoroot.cer
<Drive name for removable media>:\contosoroot_1.cer.inprocess
<Drive name for removable media>:\contosoroot_1.cer
<Drive name for removable media>:\contoso_1.cer.inprocess
<Drive name for removable media>:\applicantform_en.doc.inprocess
<Drive name for removable media>:\contoso_1.cer
<Drive name for removable media>:\testee.cer
<Drive name for removable media>:\testcertificate.cer.inprocess
<Drive name for removable media>:\testcertificate.cer
<Drive name for removable media>:\dashborder_144.bmp.inprocess
<Drive name for removable media>:\dashborder_144.bmp
<Drive name for removable media>:\dashborder_96.bmp.inprocess
<Drive name for removable media>:\dashborder_96.bmp
<Drive name for removable media>:\coffee.bmp.inprocess
<Drive name for removable media>:\coffee.bmp
<Drive name for removable media>:\dialmap.bmp.inprocess
<Drive name for removable media>:\dialmap.bmp
<Drive name for removable media>:\000814251_video_01.avi.inprocess
<Drive name for removable media>:\000814251_video_01.avi
<Drive name for removable media>:\join.avi.inprocess
<Drive name for removable media>:\testee.cer.inprocess
<Drive name for removable media>:\cveuropeo.doc
Malicious functions
To complicate detection of its presence in the operating system,
blocks the following features:
deletes volume shadow copies.
Injects code into
the following system processes:
Modifies file system
Creates the following files
%APPDATA%\key.file
%HOMEPATH%\desktop\recovery_instructions.txt
g:\$recycle.bin\s-1-5-21-1960123792-2022915161-3775307078-1001\desktop.ini
%WINDIR%\logs\windowsbackup\wbadmin.0.etl
C:\recovery_instructions.txt
C:\users\public\desktop\recovery_instructions.txt
D:\recovery_instructions.txt
g:\bootmgr.inprocess
g:\bootsect.bak.inprocess
g:\xeldz.inprocess
Sets the 'hidden' attribute to the following files
g:\$recycle.bin\s-1-5-21-1960123792-2022915161-3775307078-1001\desktop.ini
g:\bootmgr.readinstructions
g:\bootsect.bak.readinstructions
g:\xeldz.readinstructions
Moves the following files
from %WINDIR%\logs\windowsbackup\wbadmin.0.etl to %WINDIR%\logs\windowsbackup\wbadmin.1.etl
from g:\bootmgr.inprocess to g:\bootmgr.readinstructions
from g:\bootsect.bak.inprocess to g:\bootsect.bak.readinstructions
from g:\xeldz.inprocess to g:\xeldz.readinstructions
from %ProgramFiles(x86)%\mozilla firefox\precomplete to %ProgramFiles(x86)%\mozilla firefox\precomplete.inprocess
from %ProgramFiles(x86)%\mozilla firefox\precomplete.inprocess to %ProgramFiles(x86)%\mozilla firefox\precomplete.readinstructions
from %ProgramFiles(x86)%\mozilla firefox\removed-files to %ProgramFiles(x86)%\mozilla firefox\removed-files.inprocess
from %ProgramFiles(x86)%\mozilla firefox\removed-files.inprocess to %ProgramFiles(x86)%\mozilla firefox\removed-files.readinstructions
from %ProgramFiles(x86)%\mozilla thunderbird\precomplete to %ProgramFiles(x86)%\mozilla thunderbird\precomplete.inprocess
from %ProgramFiles(x86)%\mozilla thunderbird\precomplete.inprocess to %ProgramFiles(x86)%\mozilla thunderbird\precomplete.readinstructions
from %ProgramFiles(x86)%\mozilla thunderbird\removed-files to %ProgramFiles(x86)%\mozilla thunderbird\removed-files.inprocess
from %ProgramFiles(x86)%\mozilla thunderbird\removed-files.inprocess to %ProgramFiles(x86)%\mozilla thunderbird\removed-files.readinstructions
from %ProgramFiles(x86)%\opera\server_tracking_data to %ProgramFiles(x86)%\opera\server_tracking_data.inprocess
from %ProgramFiles(x86)%\opera\server_tracking_data.inprocess to %ProgramFiles(x86)%\opera\server_tracking_data.readinstructions
Changes user data files extensions (Trojan.Encoder).
Miscellaneous
Executes the following
'<SYSTEM32>\vssadmin.exe' Resize ShadowStorage /for=c: /on=c: /maxsize=401MB
'<SYSTEM32>\bcdedit.exe' /set {default} bootstatuspolicy ignoreallfailures
'<SYSTEM32>\vssadmin.exe' Resize ShadowStorage /for=h: /on=h: /maxsize=unbounded
'<SYSTEM32>\vssadmin.exe' Resize ShadowStorage /for=h: /on=h: /maxsize=401MB
'<SYSTEM32>\vssadmin.exe' Resize ShadowStorage /for=g: /on=g: /maxsize=unbounded
'<SYSTEM32>\vssadmin.exe' Resize ShadowStorage /for=g: /on=g: /maxsize=401MB
'<SYSTEM32>\vssadmin.exe' Resize ShadowStorage /for=f: /on=f: /maxsize=unbounded
'<SYSTEM32>\wbadmin.exe' DELETE SYSTEMSTATEBACKUP
'<SYSTEM32>\vssadmin.exe' Resize ShadowStorage /for=f: /on=f: /maxsize=401MB
'<SYSTEM32>\vssadmin.exe' Resize ShadowStorage /for=e: /on=e: /maxsize=401MB
'<SYSTEM32>\vssadmin.exe' Resize ShadowStorage /for=d: /on=d: /maxsize=unbounded
'<SYSTEM32>\vssadmin.exe' Resize ShadowStorage /for=d: /on=d: /maxsize=401MB
'<SYSTEM32>\vssadmin.exe' Resize ShadowStorage /for=c: /on=c: /maxsize=unbounded
'<SYSTEM32>\svchost.exe' -k swprv
'<SYSTEM32>\vssvc.exe'
'<SYSTEM32>\vssadmin.exe' Resize ShadowStorage /for=e: /on=e: /maxsize=unbounded
'<SYSTEM32>\wbem\wmic.exe' SHADOWCOPY /nointeractive
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
Download Dr.Web for Android
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