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Trojan.Encoder.35224

Added to the Dr.Web virus database: 2022-04-14

Virus description added:

Technical Information

To ensure autorun and distribution
Creates the following files on removable media
  • <Drive name for removable media>:\caltpxbo.key
  • <Drive name for removable media>:\roozenedowebinar.pptx
  • <Drive name for removable media>:\waterresourcesag.pptx
  • <Drive name for removable media>:\stoc13_ml_quoc_le.pptx
  • <Drive name for removable media>:\adhd_and_obesity.docx
  • <Drive name for removable media>:\thlps_keeper_mayer_1965.docx
  • <Drive name for removable media>:\issi2013_template_for_posters.docx
  • <Drive name for removable media>:\nwfieldnotes1966.docx
  • <Drive name for removable media>:\aoc_saq_d_v3_merchant.docx
  • <Drive name for removable media>:\uep_form_786_bulletin_1726i602.doc
  • <Drive name for removable media>:\fi51.doc
  • <Drive name for removable media>:\samieee_obiee_presentation.pptx
  • <Drive name for removable media>:\weeklysheet1215.doc
  • <Drive name for removable media>:\hanni_umami_chapter.doc
  • <Drive name for removable media>:\ovp25012015.doc
  • <Drive name for removable media>:\default.bmp
  • <Drive name for removable media>:\tileimage.bmp
  • <Drive name for removable media>:\how_to_decrypt.txt
  • <Drive name for removable media>:\dashborder_96.bmp
  • <Drive name for removable media>:\dashborder_192.bmp
  • <Drive name for removable media>:\delete.avi
  • <Drive name for removable media>:\correct.avi
  • <Drive name for removable media>:\bczrsn3a.key
  • <Drive name for removable media>:\february_catalogue__2015.doc
  • <Drive name for removable media>:\hypothyroidism_slides.pptx
Malicious functions
To complicate detection of its presence in the operating system,
deletes volume shadow copies.
Terminates or attempts to terminate
the following user processes:
  • firefox.exe
Modifies file system
Creates the following files
  • %TEMP%\abc.1111263934.exe
  • nul
  • C:\caltpxbo.key
  • D:\caltpxbo.key
  • C:\bczrsn3a.key
  • D:\bczrsn3a.key
  • C:\how_to_decrypt.txt
  • D:\how_to_decrypt.txt
Deletes the following files
  • %TEMP%\abc.1111263934.exe
Moves the following files
  • from %APPDATA%\winamp\demo.mp3 to %APPDATA%\winamp\demo.mp3.bczrsn3a_0reresrq97e
  • from %APPDATA%\opera software\opera stable\storage\ext\sync-login\def\quotamanager to %APPDATA%\opera software\opera stable\storage\ext\sync-login\def\quotamanager.caltpxbo_2pqamrb29vb
  • from %APPDATA%\opera software\opera stable\storage\ext\sync-login\def\gpucache\data_0 to %APPDATA%\opera software\opera stable\storage\ext\sync-login\def\gpucache\data_0.bczrsn3a_-dg4ocpbwch
  • from %APPDATA%\opera software\opera stable\storage\ext\sync-login\def\gpucache\data_1 to %APPDATA%\opera software\opera stable\storage\ext\sync-login\def\gpucache\data_1.bczrsn3a_0jcqkjlzwvl
  • from %APPDATA%\opera software\opera stable\local storage\https_www.yandex.ru_0.localstorage to %APPDATA%\opera software\opera stable\local storage\https_www.yandex.ru_0.localstorage.bczrsn3a_1hywfjv7-_v
  • from %APPDATA%\opera software\opera stable\local storage\https_www.yandex.ru_0.localstorage-journal to %APPDATA%\opera software\opera stable\local storage\https_www.yandex.ru_0.localstorage-journal.bczrsn3a_5ycnjwgbgyg
  • from %APPDATA%\opera software\opera stable\jump list iconsold\3651.tmp to %APPDATA%\opera software\opera stable\jump list iconsold\3651.tmp.bczrsn3a_5suljrjsulj
  • from %APPDATA%\opera software\opera stable\jump list iconsold\36a1.tmp to %APPDATA%\opera software\opera stable\jump list iconsold\36a1.tmp.caltpxbo_7i4rkzqufbq
  • from %APPDATA%\opera software\opera stable\jump list iconsold\36c3.tmp to %APPDATA%\opera software\opera stable\jump list iconsold\36c3.tmp.caltpxbo_6cgokahiseh
  • from %APPDATA%\opera software\opera stable\jump list iconsold\3703.tmp to %APPDATA%\opera software\opera stable\jump list iconsold\3703.tmp.bczrsn3a_7s0tlrlzwwz
  • from %APPDATA%\opera software\opera stable\jump list iconsold\3724.tmp to %APPDATA%\opera software\opera stable\jump list iconsold\3724.tmp.caltpxbo_2dnzwxawlpa
  • from %APPDATA%\opera software\opera stable\jump list iconsold\3765.tmp to %APPDATA%\opera software\opera stable\jump list iconsold\3765.tmp.caltpxbo_97e3t4aaaaa
  • from %APPDATA%\opera software\opera stable\jump list iconsold\3796.tmp to %APPDATA%\opera software\opera stable\jump list iconsold\3796.tmp.bczrsn3a_zo6ojqskpks
  • from %APPDATA%\opera software\opera stable\jump list icons\50ed.tmp to %APPDATA%\opera software\opera stable\jump list icons\50ed.tmp.bczrsn3a_3h4ehg4odg4
  • from %APPDATA%\opera software\opera stable\jump list icons\514d.tmp to %APPDATA%\opera software\opera stable\jump list icons\514d.tmp.bczrsn3a_2jiymkkpksk
  • from %APPDATA%\opera software\opera stable\jump list icons\516e.tmp to %APPDATA%\opera software\opera stable\jump list icons\516e.tmp.bczrsn3a_6cgokcioqki
  • from %APPDATA%\opera software\opera stable\jump list icons\51ce.tmp to %APPDATA%\opera software\opera stable\jump list icons\51ce.tmp.bczrsn3a_wicagiaaaaa
  • from %APPDATA%\opera software\opera stable\jump list icons\51ff.tmp to %APPDATA%\opera software\opera stable\jump list icons\51ff.tmp.caltpxbo_4cagiciiiii
  • from %APPDATA%\opera software\opera stable\jump list icons\524f.tmp to %APPDATA%\opera software\opera stable\jump list icons\524f.tmp.caltpxbo_-tk5otdw8n9
  • from %APPDATA%\opera software\opera stable\jump list icons\529f.tmp to %APPDATA%\opera software\opera stable\jump list icons\529f.tmp.bczrsn3a_3z2dnz5exl5
  • from %APPDATA%\mra\update\languages.aff to %APPDATA%\mra\update\languages.aff.bczrsn3a_xywfhaagica
  • from %APPDATA%\mra\update\languages.dict to %APPDATA%\mra\update\languages.dict.bczrsn3a_6cgopojcqkj
  • from %APPDATA%\mra\update\languages.hash to %APPDATA%\mra\update\languages.hash.caltpxbo_8tekpls7ozs
  • from %APPDATA%\mra\base\mra.dbs to %APPDATA%\mra\base\mra.dbs.caltpxbo_5ycnjyuljsu
  • from %APPDATA%\mra\base\opt.dbs to %APPDATA%\mra\base\opt.dbs.bczrsn3a_87ozs76-vr6
  • from %APPDATA%\mozilla\firefox\profiles\gn7ryp3k.default\content-prefs.sqlite to %APPDATA%\mozilla\firefox\profiles\gn7ryp3k.default\content-prefs.sqlite.bczrsn3a_ygokchdxv1d
  • from %APPDATA%\opera software\opera stable\storage\ext\sync-login\def\cookies to %APPDATA%\opera software\opera stable\storage\ext\sync-login\def\cookies.bczrsn3a_6ysrkwslcws
  • from %APPDATA%\mozilla\firefox\profiles\gn7ryp3k.default\cookies.sqlite to %APPDATA%\mozilla\firefox\profiles\gn7ryp3k.default\cookies.sqlite.caltpxbo_0zgrkzhywfh
  • from %APPDATA%\opera software\opera stable\web data-journal to %APPDATA%\opera software\opera stable\web data-journal.bczrsn3a_8jiygi2njy2
  • from %APPDATA%\opera software\opera stable\visited links to %APPDATA%\opera software\opera stable\visited links.caltpxbo_1f8_pyenp6e
  • from %APPDATA%\thunderbird\profiles\wjj9aet2.default\blist.sqlite to %APPDATA%\thunderbird\profiles\wjj9aet2.default\blist.sqlite.bczrsn3a_0baqeatexmt
  • from %APPDATA%\thunderbird\profiles\wjj9aet2.default\cookies.sqlite to %APPDATA%\thunderbird\profiles\wjj9aet2.default\cookies.sqlite.caltpxbo_0tls0vmzmzm
  • from %APPDATA%\thunderbird\profiles\wjj9aet2.default\global-messages-db.sqlite to %APPDATA%\thunderbird\profiles\wjj9aet2.default\global-messages-db.sqlite.caltpxbo__7-_v7t7und
  • from %APPDATA%\thunderbird\profiles\wjj9aet2.default\permissions.sqlite to %APPDATA%\thunderbird\profiles\wjj9aet2.default\permissions.sqlite.bczrsn3a_yagicclpawl
  • from %APPDATA%\thunderbird\profiles\wjj9aet2.default\places.sqlite to %APPDATA%\thunderbird\profiles\wjj9aet2.default\places.sqlite.bczrsn3a_4qkioomdawm
  • from %APPDATA%\thunderbird\profiles\wjj9aet2.default\prefs.js to %APPDATA%\thunderbird\profiles\wjj9aet2.default\prefs.js.bczrsn3a_9ra2tohbwch
  • from %APPDATA%\thunderbird\profiles\wjj9aet2.default\webappsstore.sqlite to %APPDATA%\thunderbird\profiles\wjj9aet2.default\webappsstore.sqlite.bczrsn3a_xgygbjy8vly
  • from %APPDATA%\telegram desktop\log.txt to %APPDATA%\telegram desktop\log.txt.caltpxbo-9ra2triymji
  • from %APPDATA%\telegram desktop\tdata\90ef50e22e92cb8c0 to %APPDATA%\telegram desktop\tdata\90ef50e22e92cb8c0.caltpxbo_5awlpzwvlzw
  • from %APPDATA%\opera software\opera stable\bookmarks to %APPDATA%\opera software\opera stable\bookmarks.bczrsn3a_1zwvlbkysrk
  • from %APPDATA%\opera software\opera stable\bookmarks.bak to %APPDATA%\opera software\opera stable\bookmarks.bak.bczrsn3a_ygoqklj4-pj
  • from %APPDATA%\opera software\opera stable\bookmarksextras to %APPDATA%\opera software\opera stable\bookmarksextras.bczrsn3a_5ikjcsvr6-v
  • from %APPDATA%\opera software\opera stable\browser.js to %APPDATA%\opera software\opera stable\browser.js.bczrsn3a_3r0dhrntu1n
  • from %APPDATA%\opera software\opera stable\cookies to %APPDATA%\opera software\opera stable\cookies.caltpxbo_0rererkskqw
  • from %APPDATA%\opera software\opera stable\cookies-journal to %APPDATA%\opera software\opera stable\cookies-journal.caltpxbo_6kioql29vb2
  • from %APPDATA%\opera software\opera stable\favicons to %APPDATA%\opera software\opera stable\favicons.caltpxbo_3jycnjpt09p
  • from %APPDATA%\opera software\opera stable\favicons-journal to %APPDATA%\opera software\opera stable\favicons-journal.bczrsn3a__7-_v5cqkjc
  • from %APPDATA%\opera software\opera stable\history to %APPDATA%\opera software\opera stable\history.caltpxbo_2rkzgqmdawm
  • from %APPDATA%\opera software\opera stable\history-journal to %APPDATA%\opera software\opera stable\history-journal.bczrsn3a_-zs7owbaqeb
  • from %APPDATA%\opera software\opera stable\login data to %APPDATA%\opera software\opera stable\login data.bczrsn3a_zg4odidg4od
  • from %APPDATA%\opera software\opera stable\origin bound certs to %APPDATA%\opera software\opera stable\origin bound certs.caltpxbo_2bgdg6zs7oz
  • from %APPDATA%\opera software\opera stable\preferences to %APPDATA%\opera software\opera stable\preferences.bczrsn3a__r6-vpdq0nd
  • from %APPDATA%\opera software\opera stable\quotamanager to %APPDATA%\opera software\opera stable\quotamanager.bczrsn3a_-jo6ojdw8pd
  • from %APPDATA%\opera software\opera stable\session.db-journal to %APPDATA%\opera software\opera stable\session.db-journal.bczrsn3a_xgysrj1dxv1
  • from %APPDATA%\opera software\opera stable\session.dbak to %APPDATA%\opera software\opera stable\session.dbak.bczrsn3a__7-_v5cqkjc
  • from %APPDATA%\opera software\opera stable\web data to %APPDATA%\opera software\opera stable\web data.bczrsn3a_35-fn4uli4u
  • from %APPDATA%\mozilla\firefox\profiles\gn7ryp3k.default\cookies.sqlite-shm to %APPDATA%\mozilla\firefox\profiles\gn7ryp3k.default\cookies.sqlite-shm.bczrsn3a_zo6ojqskpks
Modifies the following files
  • <Drive name for removable media>:\dashborder_192.bmp.caltpxbo_-jo6oja2tra
  • <Drive name for removable media>:\correct.avi.bczrsn3a_8dawmaokcgo
  • <Drive name for removable media>:\delete.avi.caltpxbo_2zmzmzubm5u
  • <Drive name for removable media>:\dashborder_96.bmp.caltpxbo_4seuli9pt09
  • <Drive name for removable media>:\tileimage.bmp.bczrsn3a_46ojo5zwvlz
  • <Drive name for removable media>:\default.bmp.bczrsn3a_4kcgtrzwvlz
  • <Drive name for removable media>:\hanni_umami_chapter.doc.caltpxbo-zawmdaufbqu
  • <Drive name for removable media>:\issi2013_template_for_posters.docx.caltpxbo--dg4oc6urps
Substitutes the following files
  • <Drive name for removable media>:\february_catalogue__2015.doc
  • <Drive name for removable media>:\aoc_saq_d_v3_merchant.docx
Changes user data files extensions (Trojan.Encoder).

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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