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Trojan.Encoder.33743

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
  • [<HKCU>\Software\Microsoft\Windows\CurrentVersion\RunOnce] '{272EBD3A-4F22-59D4-5635-61E7E0F572A6}' = '%APPDATA%\guide.exe'
Creates the following files on removable media
  • <Drive name for removable media>:\correct.avi
  • <Drive name for removable media>:\contoso.cer
  • <Drive name for removable media>:\pmd.cer
  • <Drive name for removable media>:\contoso_1.cer
  • <Drive name for removable media>:\sdkfailsafeemulator.cer
  • <Drive name for removable media>:\sdksampleunprivdeveloper.cer
  • <Drive name for removable media>:\testcertificate.cer
  • <Drive name for removable media>:\sdksampleprivdeveloper.cer
  • <Drive name for removable media>:\contosoroot_1.cer
  • <Drive name for removable media>:\dashborder_192.bmp
  • <Drive name for removable media>:\lisp_success.doc
  • <Drive name for removable media>:\tileimage.bmp
  • <Drive name for removable media>:\dial.bmp
  • <Drive name for removable media>:\dashborder_96.bmp
  • <Drive name for removable media>:\dashborder_120.bmp
  • <Drive name for removable media>:\default.bmp
  • <Drive name for removable media>:\dialmap.bmp
  • <Drive name for removable media>:\delete.avi
  • <Drive name for removable media>:\000814251_video_01.avi
  • <Drive name for removable media>:\split.avi
  • <Drive name for removable media>:\how to recover encrypted files.txt
  • <Drive name for removable media>:\coffee.bmp
  • <Drive name for removable media>:\hanni_umami_chapter.doc
Malicious functions
To complicate detection of its presence in the operating system,
deletes volume shadow copies.
Reads files which store third party applications passwords
  • %HOMEPATH%\desktop\000814251_video_01.avi
  • %HOMEPATH%\desktop\508softwareandos.doc
  • %HOMEPATH%\desktop\archer.avi
  • %HOMEPATH%\desktop\contoso.cer
  • %HOMEPATH%\desktop\contoso_1.cer
  • %HOMEPATH%\desktop\correct.avi
  • %HOMEPATH%\desktop\cveuropeo.doc
  • %HOMEPATH%\desktop\dashborder_144.bmp
  • %HOMEPATH%\desktop\dashborder_96.bmp
  • %HOMEPATH%\desktop\february_catalogue__2015.doc
  • %HOMEPATH%\desktop\fi51.doc
  • %HOMEPATH%\desktop\glidescope_review_rev_010.docx
  • %HOMEPATH%\desktop\pmd.cer
  • %HOMEPATH%\desktop\sdksampleprivdeveloper.cer
  • %HOMEPATH%\desktop\sdszfo.docx
Modifies file system
Creates the following files
  • %APPDATA%\guide.exe
  • C:\far2\plugins\editcase\how to recover encrypted files.txt
  • C:\far2\plugins\emenu\how to recover encrypted files.txt
  • C:\far2\plugins\farcmds\how to recover encrypted files.txt
  • C:\far2\plugins\filecase\how to recover encrypted files.txt
  • C:\far2\plugins\ftp\how to recover encrypted files.txt
  • C:\far2\plugins\ftp\lib\how to recover encrypted files.txt
  • C:\far2\plugins\hlfviewer\how to recover encrypted files.txt
  • %HOMEPATH%\searches\how to recover encrypted files.txt
  • C:\far2\plugins\macroview\how to recover encrypted files.txt
  • C:\far2\plugins\proclist\how to recover encrypted files.txt
  • C:\far2\plugins\tmppanel\how to recover encrypted files.txt
  • C:\far2\pluginsdk\headers.c\how to recover encrypted files.txt
  • C:\far2\pluginsdk\headers.pas\how to recover encrypted files.txt
  • C:\totalcmd\how to recover encrypted files.txt
  • C:\users\public\music\sample music\how to recover encrypted files.txt
  • C:\users\public\pictures\sample pictures\how to recover encrypted files.txt
  • C:\far2\plugins\compare\how to recover encrypted files.txt
  • C:\far2\plugins\drawline\how to recover encrypted files.txt
  • C:\far2\plugins\brackets\how to recover encrypted files.txt
  • C:\far2\plugins\autowrap\how to recover encrypted files.txt
  • C:\far2\plugins\arclite\how to recover encrypted files.txt
  • %HOMEPATH%\contacts\how to recover encrypted files.txt
  • %HOMEPATH%\desktop\how to recover encrypted files.txt
  • %HOMEPATH%\favorites\links\how to recover encrypted files.txt
  • %HOMEPATH%\favorites\links for united states\how to recover encrypted files.txt
  • %HOMEPATH%\favorites\microsoft websites\how to recover encrypted files.txt
  • %HOMEPATH%\favorites\msn websites\how to recover encrypted files.txt
  • %HOMEPATH%\favorites\windows live\how to recover encrypted files.txt
  • C:\users\public\videos\sample videos\how to recover encrypted files.txt
  • C:\far2\plugins\network\how to recover encrypted files.txt
  • %HOMEPATH%\links\how to recover encrypted files.txt
  • C:\far2\addons\how to recover encrypted files.txt
  • C:\far2\addons\shell\how to recover encrypted files.txt
  • C:\far2\documentation\eng\how to recover encrypted files.txt
  • C:\far2\documentation\rus\how to recover encrypted files.txt
  • C:\far2\encyclopedia\how to recover encrypted files.txt
  • C:\far2\encyclopedia\tap\how to recover encrypted files.txt
  • C:\far2\plugins\align\how to recover encrypted files.txt
  • %TEMP%\{421a75c8-421a-421a-421a-421a75c85458}.bat
  • C:\far2\how to recover encrypted files.txt
  • D:\how to recover encrypted files.txt
Deletes the following files
  • %APPDATA%\guide.exe
Modifies the following files
  • %HOMEPATH%\contacts\user.contact
  • %HOMEPATH%\favorites\msn websites\msn entertainment.url
  • %HOMEPATH%\favorites\msn websites\msn autos.url
  • %HOMEPATH%\favorites\microsoft websites\microsoft store.url
  • %HOMEPATH%\favorites\microsoft websites\microsoft at work.url
  • %HOMEPATH%\favorites\microsoft websites\microsoft at home.url
  • %HOMEPATH%\favorites\microsoft websites\ie site on microsoft.com.url
  • %HOMEPATH%\favorites\microsoft websites\ie add-on site.url
  • %HOMEPATH%\favorites\links for united states\usa.gov.url
  • %HOMEPATH%\favorites\links for united states\gobiernousa.gov.url
  • %HOMEPATH%\favorites\links\web slice gallery.url
  • %HOMEPATH%\favorites\links\suggested sites.url
  • %HOMEPATH%\desktop\total commander 64 bit.lnk
  • %HOMEPATH%\desktop\telegram.lnk
  • %HOMEPATH%\desktop\qip 2012.lnk
  • %HOMEPATH%\desktop\mail.ru agent.lnk
  • %HOMEPATH%\desktop\icq.lnk
  • %HOMEPATH%\desktop\fi51.doc
  • %HOMEPATH%\desktop\february_catalogue__2015.doc
  • %HOMEPATH%\desktop\dashborder_96.bmp
  • %HOMEPATH%\desktop\dashborder_144.bmp
  • %HOMEPATH%\desktop\cveuropeo.doc
  • %HOMEPATH%\desktop\correct.avi
  • %HOMEPATH%\desktop\contoso_1.cer
  • %HOMEPATH%\desktop\contoso.cer
  • %HOMEPATH%\desktop\archer.avi
  • %HOMEPATH%\desktop\508softwareandos.doc
  • %HOMEPATH%\desktop\000814251_video_01.avi
  • %HOMEPATH%\favorites\msn websites\msn money.url
  • %HOMEPATH%\favorites\msn websites\msn sports.url
Modifies multiple files.
Substitutes the following files
  • %APPDATA%\guide.exe
Deletes itself.
Modifies user data files (Trojan.Encoder).
Network activity
Connects to
  • 'ip###ger.com':80
  • 'ip###ger.org':443
  • 'microsoft.com':80
  • 'oc##.#ectigo.com':80
TCP
  • 'ip###ger.com':443
UDP
  • DNS ASK ip###ger.com
  • DNS ASK ip###ger.org
  • DNS ASK microsoft.com
  • DNS ASK oc##.#ectigo.com
Miscellaneous
Creates and executes the following
  • '%WINDIR%\syswow64\cmd.exe' /c %TEMP%\{421A75C8-421A-421A-421A-421A75C85458}.bat' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin Delete Shadows /for=C: /All' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin Delete Shadows /for=D: /All' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin Delete Shadows /for=E: /All' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin Delete Shadows /for=F: /All' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c wbadmin DELETE SYSTEMSTATEBACKUP -keepVersions:0' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c wmic SHADOWCOPY DELETE' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin Delete Shadows /All /Quiet' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c bcdedit /set {default} recoveryenabled No' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /c bcdedit /set {default} bootstatuspolicy ignoreallfailures' (with hidden window)
Executes the following
  • '%WINDIR%\syswow64\cmd.exe' /c %TEMP%\{421A75C8-421A-421A-421A-421A75C85458}.bat
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin Delete Shadows /for=C: /All
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin Delete Shadows /for=D: /All
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin Delete Shadows /for=E: /All
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin Delete Shadows /for=F: /All
  • '%WINDIR%\syswow64\cmd.exe' /c wbadmin DELETE SYSTEMSTATEBACKUP -keepVersions:0
  • '%WINDIR%\syswow64\cmd.exe' /c wmic SHADOWCOPY DELETE
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin Delete Shadows /All /Quiet
  • '%WINDIR%\syswow64\cmd.exe' /c bcdedit /set {default} recoveryenabled No
  • '%WINDIR%\syswow64\cmd.exe' /c bcdedit /set {default} bootstatuspolicy ignoreallfailures

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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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.

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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

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