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Trojan.Encoder.34040

Added to the Dr.Web virus database: 2021-06-18

Virus description added:

Technical Information

To ensure autorun and distribution
Creates or modifies the following files
  • %APPDATA%\microsoft\windows\start menu\programs\startup\<File name>.exe
Creates the following files on removable media
  • <Drive name for removable media>:\sarajay.exe
  • <Drive name for removable media>:\autorun.inf
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\508softwareandos.doc
  • %HOMEPATH%\desktop\tileimage.bmp
  • %HOMEPATH%\desktop\sdszfo.docx
  • %HOMEPATH%\desktop\sdkfailsafeemulator.cer
  • %HOMEPATH%\desktop\ituneshelpunavailable.html
  • %HOMEPATH%\desktop\hanni_umami_chapter.doc
  • %HOMEPATH%\desktop\delete.avi
  • %HOMEPATH%\desktop\uep_form_786_bulletin_1726i602.doc
  • %HOMEPATH%\desktop\default.bmp
  • %HOMEPATH%\desktop\dashborder_144.bmp
  • %HOMEPATH%\desktop\dashborder_120.bmp
  • %HOMEPATH%\desktop\correct.avi
  • %HOMEPATH%\desktop\contoso.cer
  • %HOMEPATH%\desktop\archer.avi
  • %HOMEPATH%\desktop\api-hashmap.html
  • %HOMEPATH%\desktop\dashborder_96.bmp
  • %HOMEPATH%\desktop\weeklysheet1215.doc
Modifies file system
Creates the following files
  • C:\readme.txt
  • %HOMEPATH%\favorites\microsoft websites\microsoft at work.url.poteston
  • %HOMEPATH%\favorites\microsoft websites\microsoft at home.url.poteston
  • %HOMEPATH%\favorites\microsoft websites\ie site on microsoft.com.url.poteston
  • %HOMEPATH%\favorites\microsoft websites\ie add-on site.url.poteston
  • %HOMEPATH%\favorites\links for united states\readme.txt
  • %HOMEPATH%\favorites\links for united states\usa.gov.url.poteston
  • %HOMEPATH%\favorites\links for united states\gobiernousa.gov.url.poteston
  • %HOMEPATH%\favorites\microsoft websites\readme.txt
  • %HOMEPATH%\favorites\microsoft websites\microsoft store.url.poteston
  • %HOMEPATH%\favorites\links\web slice gallery.url.poteston
  • %HOMEPATH%\favorites\links\suggested sites.url.poteston
  • %HOMEPATH%\favorites\links\desktop.ini.poteston
  • %HOMEPATH%\favorites\desktop.ini.poteston
  • %HOMEPATH%\saved games\desktop.ini.poteston
  • %HOMEPATH%\music\readme.txt.poteston
  • %HOMEPATH%\music\desktop.ini.poteston
  • %HOMEPATH%\favorites\links for united states\desktop.ini.poteston
  • %HOMEPATH%\links\recentplaces.lnk.poteston
  • %HOMEPATH%\favorites\msn websites\msn autos.url.poteston
  • C:\autorun.inf
  • C:\sarajay.exe
  • %HOMEPATH%\videos\readme.txt.poteston
  • %HOMEPATH%\videos\desktop.ini.poteston
  • %HOMEPATH%\searches\indexed locations.search-ms.poteston
  • %HOMEPATH%\searches\everywhere.search-ms.poteston
  • %HOMEPATH%\searches\desktop.ini.poteston
  • %HOMEPATH%\favorites\windows live\readme.txt
  • %HOMEPATH%\favorites\windows live\windows live spaces.url.poteston
  • %HOMEPATH%\favorites\windows live\windows live mail.url.poteston
  • %HOMEPATH%\favorites\windows live\windows live gallery.url.poteston
  • %HOMEPATH%\favorites\windows live\get windows live.url.poteston
  • %HOMEPATH%\favorites\msn websites\readme.txt
  • %HOMEPATH%\favorites\msn websites\msnbc news.url.poteston
  • %HOMEPATH%\favorites\msn websites\msn.url.poteston
  • %HOMEPATH%\favorites\msn websites\msn sports.url.poteston
  • %HOMEPATH%\favorites\msn websites\msn money.url.poteston
  • %HOMEPATH%\pictures\readme.txt.poteston
  • %HOMEPATH%\favorites\links\readme.txt
  • %HOMEPATH%\pictures\desktop.ini.poteston
  • %HOMEPATH%\downloads\winamp5666_full_all.exe.poteston
  • %HOMEPATH%\downloads\thunderbird setup 31.6.0.exe.poteston
  • %HOMEPATH%\desktop\correct.avi.poteston
  • %HOMEPATH%\desktop\total commander 64 bit.lnk.poteston
  • %HOMEPATH%\desktop\telegram.lnk.poteston
  • %HOMEPATH%\desktop\qip 2012.lnk.poteston
  • %HOMEPATH%\desktop\notepad.exe.poteston
  • %HOMEPATH%\desktop\mail.ru agent.lnk.poteston
  • %HOMEPATH%\desktop\icq.lnk.poteston
  • %HOMEPATH%\desktop\desktop.ini.poteston
  • %HOMEPATH%\desktop\contoso.cer.poteston
  • %HOMEPATH%\links\desktop.lnk.poteston
  • %HOMEPATH%\desktop\calc.exe.poteston
  • %HOMEPATH%\desktop\archer.avi.poteston
  • %HOMEPATH%\desktop\api-hashmap.html.poteston
  • %HOMEPATH%\desktop\508softwareandos.doc.poteston
  • D:\readme.txt
  • D:\$recycle.bin\readme.txt
  • D:\install.log.poteston
  • D:\sarajay.exe
  • %HOMEPATH%\favorites\msn websites\msn entertainment.url.poteston
  • %HOMEPATH%\links\downloads.lnk.poteston
  • %HOMEPATH%\contacts\user.contact.poteston
  • %HOMEPATH%\links\desktop.ini.poteston
  • %HOMEPATH%\downloads\tcmd851ax64.exe.poteston
  • %HOMEPATH%\downloads\steamsetup.exe.poteston
  • %HOMEPATH%\downloads\pidgin-2.10.11.exe.poteston
  • %HOMEPATH%\downloads\opera_ni_stable.exe.poteston
  • %HOMEPATH%\downloads\mirc741.exe.poteston
  • %HOMEPATH%\downloads\magent_rfrset.exe.poteston
  • %HOMEPATH%\downloads\k-lite_codec_pack_1110_mega_dlm.exe.poteston
  • %HOMEPATH%\downloads\k-lite_codec_pack_1110_mega.exe.poteston
  • %HOMEPATH%\downloads\jre-8u45-windows-x64.exe.poteston
  • %HOMEPATH%\downloads\icq_rfrset.exe.poteston
  • %HOMEPATH%\downloads\desktop.ini.poteston
  • %HOMEPATH%\downloads\chromesetup.exe.poteston
  • %HOMEPATH%\documents\my videos\readme.txt
  • %HOMEPATH%\documents\my pictures\readme.txt
  • %HOMEPATH%\documents\my music\readme.txt
  • %HOMEPATH%\documents\desktop.ini.poteston
  • %HOMEPATH%\contacts\desktop.ini.poteston
  • D:\autorun.inf
Sets the 'hidden' attribute to the following files
  • C:\autorun.inf
  • C:\sarajay.exe
  • D:\autorun.inf
  • D:\sarajay.exe
  • <Drive name for removable media>:\autorun.inf
  • <Drive name for removable media>:\sarajay.exe
Changes user data files extensions (Trojan.Encoder).
Miscellaneous
Executes the following
  • '%WINDIR%\syswow64\cmd.exe' /c vssadmin.exe delete shadows /all /quiet

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.

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