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Trojan.Encoder.35811

Added to the Dr.Web virus database: 2022-09-07

Virus description added:

Technical Information

To ensure autorun and distribution
Modifies the following registry keys
  • [<HKCU>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Michael Gillespie' = '%ALLUSERSPROFILE%\winlogon.exe'
  • [<HKLM>\SOFTWARE\Wow6432Node\Microsoft\Windows\CurrentVersion\Run] 'Michael Gillespie' = '%WINDIR%\winlogon.exe'
  • [<HKLM>\Software\Classes\Loki\shell\open\command] '' = '%ALLUSERSPROFILE%\ejbtaj42.exe "%l" '
Creates or modifies the following files
  • %APPDATA%\microsoft\windows\start menu\programs\startup\winlogon.exe
  • %APPDATA%\microsoft\windows\start menu\programs\startup\wvtymcow.bat
  • <SYSTEM32>\tasks\loki
Sets the following service settings
  • [<HKLM>\System\CurrentControlSet\Services\IKEEXT] 'Start' = '00000002'
Creates the following files on removable media
  • <Drive name for removable media>:\cpriv.loki
  • <Drive name for removable media>:\restore-my-files.txt
Malicious functions
To complicate detection of its presence in the operating system,
blocks execution of the following system utilities:
  • Windows Defender
deletes volume shadow copies.
Executes the following
  • '%WINDIR%\syswow64\netsh.exe' firewall set opmode mode=disable
Reads files which store third party applications passwords
  • %HOMEPATH%\desktop\2.jpeg
  • %HOMEPATH%\desktop\toolbar.bmp
  • %HOMEPATH%\desktop\tileimage.bmp
  • %HOMEPATH%\desktop\sdszfo.docx
  • %HOMEPATH%\desktop\holycrosschurchinstructions.docx
  • %HOMEPATH%\desktop\hadac_newsletter_july_2010_final.docx
  • %HOMEPATH%\desktop\garden.htm
  • %HOMEPATH%\desktop\trivial-merge.htm
  • %HOMEPATH%\desktop\contoso_1.cer
  • %HOMEPATH%\desktop\applicantform_en.doc
  • %HOMEPATH%\desktop\aoc_saq_d_v3_merchant.docx
  • %HOMEPATH%\desktop\alert.htm
  • %HOMEPATH%\desktop\adhd_and_obesity.docx
  • %HOMEPATH%\desktop\adadsi.html
  • %HOMEPATH%\desktop\64bit_notes.htm
  • %HOMEPATH%\desktop\browse.htm
  • %HOMEPATH%\desktop\trivial-merge.html
Modifies file system
Creates the following files
  • %APPDATA%\winlogon.exe
  • C:\msocache\all users\{90140000-0016-0409-1000-0000000ff1ce}-c\restore-my-files.txt
  • C:\msocache\all users\{90140000-0018-0409-1000-0000000ff1ce}-c\restore-my-files.txt
  • C:\msocache\all users\{90140000-0019-0409-1000-0000000ff1ce}-c\restore-my-files.txt
  • C:\msocache\all users\{90140000-001a-0409-1000-0000000ff1ce}-c\restore-my-files.txt
  • C:\msocache\all users\{90140000-001b-0409-1000-0000000ff1ce}-c\restore-my-files.txt
  • C:\msocache\all users\{90140000-0115-0409-1000-0000000ff1ce}-c\1033\restore-my-files.txt
  • C:\msocache\all users\{90140000-0011-0000-1000-0000000ff1ce}-c\restore-my-files.txt
  • <Current directory>\restore-my-files.txt
  • C:\msocache\all users\{90140000-002c-0409-1000-0000000ff1ce}-c\restore-my-files.txt
  • C:\msocache\all users\{90140000-0043-0409-1000-0000000ff1ce}-c\restore-my-files.txt
  • C:\msocache\all users\{90140000-0044-0409-1000-0000000ff1ce}-c\restore-my-files.txt
  • C:\msocache\all users\{90140000-00a1-0409-1000-0000000ff1ce}-c\restore-my-files.txt
  • C:\msocache\all users\{90140000-00ba-0409-1000-0000000ff1ce}-c\restore-my-files.txt
  • C:\msocache\all users\{90140000-002c-0409-1000-0000000ff1ce}-c\proof.en\restore-my-files.txt
  • C:\msocache\all users\{90140000-002c-0409-1000-0000000ff1ce}-c\proof.fr\restore-my-files.txt
  • C:\far2\plugins\arclite\restore-my-files.txt
  • C:\msocache\all users\{90140000-002c-0409-1000-0000000ff1ce}-c\proof.es\restore-my-files.txt
  • C:\far2\plugins\filecase\restore-my-files.txt
  • C:\far2\plugins\brackets\restore-my-files.txt
  • C:\far2\plugins\compare\restore-my-files.txt
  • C:\far2\plugins\drawline\restore-my-files.txt
  • C:\far2\plugins\editcase\restore-my-files.txt
  • C:\far2\plugins\emenu\restore-my-files.txt
  • C:\far2\plugins\tmppanel\restore-my-files.txt
  • C:\far2\pluginsdk\headers.pas\restore-my-files.txt
  • C:\far2\pluginsdk\headers.c\restore-my-files.txt
  • C:\far2\plugins\ftp\lib\restore-my-files.txt
  • C:\far2\plugins\hlfviewer\restore-my-files.txt
  • C:\far2\plugins\macroview\restore-my-files.txt
  • C:\far2\plugins\network\restore-my-files.txt
  • C:\far2\plugins\proclist\restore-my-files.txt
  • C:\far2\plugins\farcmds\restore-my-files.txt
  • C:\far2\plugins\ftp\restore-my-files.txt
  • C:\far2\plugins\autowrap\restore-my-files.txt
  • C:\msocache\all users\{90140000-0115-0409-1000-0000000ff1ce}-c\restore-my-files.txt
  • %ProgramFiles%\a2cmd\restore-my-files.txt
  • %ProgramFiles%\almon\restore-my-files.txt
  • %ProgramFiles%\alsvc\restore-my-files.txt
  • %ProgramFiles%\amon\restore-my-files.txt
  • %ProgramFiles%\amsn\restore-my-files.txt
  • %ProgramFiles%\anti-trojan\restore-my-files.txt
  • %ProgramFiles%\aimpro\restore-my-files.txt
  • %ProgramFiles%\airdefense\restore-my-files.txt
  • %ProgramFiles%\antivirus\restore-my-files.txt
  • %ProgramFiles%\armorsurf\restore-my-files.txt
  • %ProgramFiles%\ash\restore-my-files.txt
  • %ProgramFiles%\ashavast\restore-my-files.txt
  • %ProgramFiles%\ashavsrv\restore-my-files.txt
  • %ProgramFiles%\ashchest\restore-my-files.txt
  • %ProgramFiles%\aoltbserver\restore-my-files.txt
  • %ProgramFiles%\armor2net\restore-my-files.txt
  • C:\msocache\all users\{90140000-0117-0409-1000-0000000ff1ce}-c\restore-my-files.txt
  • C:\msocache\all users\{90140000-0117-0409-1000-0000000ff1ce}-c\access.en-us\restore-my-files.txt
  • %ProgramFiles%\ageofconan\restore-my-files.txt
  • %ProgramFiles%\a2guard\restore-my-files.txt
  • %ProgramFiles%\a2hijackfree\restore-my-files.txt
  • %ProgramFiles%\a2scan\restore-my-files.txt
  • %ProgramFiles%\a2service\restore-my-files.txt
  • %ProgramFiles%\ahnsd\restore-my-files.txt
  • %ProgramFiles%\360tray\restore-my-files.txt
  • %ProgramFiles%\aim6\restore-my-files.txt
  • %ProgramFiles%\a2start\restore-my-files.txt
  • %ProgramFiles%\about\restore-my-files.txt
  • %ProgramFiles%\ackwin32\restore-my-files.txt
  • %ProgramFiles%\admunch\restore-my-files.txt
  • %ProgramFiles%\agb5\restore-my-files.txt
  • %ProgramFiles%\a2upd\restore-my-files.txt
  • %ProgramFiles%\a2wizard\restore-my-files.txt
  • %ProgramFiles%\aavshield\restore-my-files.txt
  • C:\far2\plugins\align\restore-my-files.txt
  • C:\far2\fexcept\restore-my-files.txt
  • C:\far2\encyclopedia\tap\restore-my-files.txt
  • %HOMEPATH%\videos\cpriv.loki
  • %HOMEPATH%\music\cpriv.loki
  • %ALLUSERSPROFILE%\cpriv.loki
  • D:\restore-my-files.txt
  • b:\restore-my-files.txt
  • %HOMEPATH%\documents\cpriv.loki
  • C:\users\public\pictures\restore-my-files.txt
  • %HOMEPATH%\desktop\cpriv.loki
  • C:\users\public\documents\restore-my-files.txt
  • C:\users\public\downloads\restore-my-files.txt
  • C:\users\public\libraries\restore-my-files.txt
  • C:\users\public\music\restore-my-files.txt
  • C:\users\public\music\sample music\restore-my-files.txt
  • C:\users\default\restore-my-files.txt
  • C:\restore-my-files.txt
  • C:\users\public\desktop\restore-my-files.txt
  • %HOMEPATH%\favorites\cpriv.loki
  • %TEMP%\res863f.tmp
  • %ALLUSERSPROFILE%\microsoft\windows\start menu\programs\startup\winlogon.exe
  • %WINDIR%\winlogon.exe
  • %TEMP%\v4llsjli.ico
  • %TEMP%\iyygbuii.0.cs
  • %TEMP%\iyygbuii.cmdline
  • %APPDATA%\microsoft\windows\recent\cpriv.loki
  • C:\users\public\pictures\sample pictures\restore-my-files.txt
  • %ALLUSERSPROFILE%\winlogon.exe
  • %ALLUSERSPROFILE%\ejbtaj42.exe
  • %ALLUSERSPROFILE%\info.loki
  • b:\cpriv.loki
  • C:\cpriv.loki
  • D:\cpriv.loki
  • %ALLUSERSPROFILE%\csc4fb661caa6eb436d9a68f477efa1bc38.tmp
  • %TEMP%\iyygbuii.out
  • %HOMEPATH%\pictures\cpriv.loki
  • C:\users\public\recorded tv\restore-my-files.txt
  • %HOMEPATH%\restore-my-files.txt
  • C:\far2\addons\colors\default_highlighting\restore-my-files.txt
  • C:\far2\addons\colors\restore-my-files.txt
  • C:\far2\addons\restore-my-files.txt
  • C:\far2\addons\macros\restore-my-files.txt
  • %HOMEPATH%\videos\restore-my-files.txt
  • %HOMEPATH%\saved games\restore-my-files.txt
  • C:\far2\addons\colors\custom_highlighting\restore-my-files.txt
  • C:\far2\addons\setup\restore-my-files.txt
  • C:\far2\restore-my-files.txt
  • C:\far2\documentation\eng\restore-my-files.txt
  • C:\far2\documentation\rus\restore-my-files.txt
  • C:\far2\encyclopedia\restore-my-files.txt
  • C:\far2\addons\shell\restore-my-files.txt
  • C:\far2\addons\xlat\restore-my-files.txt
  • C:\far2\addons\xlat\russian\restore-my-files.txt
  • %HOMEPATH%\searches\restore-my-files.txt
  • %HOMEPATH%\pictures\restore-my-files.txt
  • C:\users\public\recorded tv\sample media\restore-my-files.txt
  • C:\users\public\videos\sample videos\restore-my-files.txt
  • C:\users\public\restore-my-files.txt
  • %HOMEPATH%\contacts\restore-my-files.txt
  • %HOMEPATH%\desktop\restore-my-files.txt
  • %HOMEPATH%\documents\restore-my-files.txt
  • %HOMEPATH%\downloads\restore-my-files.txt
  • C:\users\public\videos\restore-my-files.txt
  • %HOMEPATH%\favorites\restore-my-files.txt
  • %HOMEPATH%\favorites\links for united states\restore-my-files.txt
  • %HOMEPATH%\favorites\microsoft websites\restore-my-files.txt
  • %HOMEPATH%\favorites\msn websites\restore-my-files.txt
  • %HOMEPATH%\favorites\windows live\restore-my-files.txt
  • %HOMEPATH%\links\restore-my-files.txt
  • %HOMEPATH%\music\restore-my-files.txt
  • %HOMEPATH%\favorites\links\restore-my-files.txt
  • %ProgramFiles%\ashdisp\restore-my-files.txt
  • %ProgramFiles%\ashdug\restore-my-files.txt
Sets the 'hidden' attribute to the following files
  • %APPDATA%\winlogon.exe
  • %ALLUSERSPROFILE%\winlogon.exe
  • %WINDIR%\winlogon.exe
  • %ALLUSERSPROFILE%\ejbtaj42.exe
Deletes the following files
  • %TEMP%\res863f.tmp
  • %ALLUSERSPROFILE%\csc4fb661caa6eb436d9a68f477efa1bc38.tmp
  • %TEMP%\iyygbuii.out
  • %TEMP%\iyygbuii.0.cs
  • %TEMP%\iyygbuii.cmdline
Moves the following files
  • from %ProgramFiles%\desktop.ini to %ProgramFiles%\[vulcanteam@cock.li][ef5e1a70]desktop.ini.loki
Modifies the following files
  • D:\install.log
  • C:\users\public\music\sample music\kalimba.mp3
  • C:\users\public\music\sample music\folder.jpg
  • C:\users\public\music\sample music\desktop.ini
  • C:\users\public\music\sample music\albumart_{5fa05d35-a682-4af6-96f7-0773e42d4d16}_small.jpg
  • C:\users\public\music\sample music\albumart_{5fa05d35-a682-4af6-96f7-0773e42d4d16}_large.jpg
  • C:\users\public\music\sample music\albumartsmall.jpg
  • C:\users\public\music\desktop.ini
  • C:\users\public\libraries\recordedtv.library-ms
  • C:\users\public\libraries\desktop.ini
  • C:\users\public\downloads\desktop.ini
  • C:\users\public\documents\desktop.ini
  • C:\users\public\desktop\winamp.lnk
  • C:\users\public\desktop\steam.lnk
  • C:\users\public\desktop\opera.lnk
  • C:\users\public\desktop\mozilla thunderbird.lnk
  • C:\users\public\desktop\mozilla firefox.lnk
  • C:\users\public\desktop\mirc.lnk
  • C:\users\public\desktop\google chrome.lnk
  • C:\users\public\desktop\desktop.ini
  • C:\users\public\desktop\acrobat reader dc.lnk
  • C:\users\default\ntuser.dat{016888bd-6c6f-11de-8d1d-001e0bcde3ec}.tmcontainer00000000000000000002.regtrans-ms
  • C:\users\default\ntuser.dat{016888bd-6c6f-11de-8d1d-001e0bcde3ec}.tmcontainer00000000000000000001.regtrans-ms
  • C:\users\default\ntuser.dat{016888bd-6c6f-11de-8d1d-001e0bcde3ec}.tm.blf
  • C:\users\default\ntuser.dat.log2
  • C:\users\default\ntuser.dat.log1
  • C:\users\default\ntuser.dat.log
  • C:\users\default\ntuser.dat
  • C:\users\public\music\sample music\maid with the flaxen hair.mp3
  • C:\users\public\music\sample music\sleep away.mp3
Modifies multiple files.
Modifies user data files (Trojan.Encoder).
Network activity
Connects to
  • '<LOCALNET>.39.1':445
  • '<LOCALNET>.39.1':139
  • 'ip##pi.com':80
TCP
HTTP GET requests
  • http://ip##pi.com/json
UDP
  • DNS ASK ip##pi.com
Miscellaneous
Creates and executes the following
  • '%WINDIR%\syswow64\cmd.exe' /C schtasks /CREATE /SC ONLOGON /TN Loki /TR %APPDATA%\winlogon.exe /RU SYSTEM /RL HIGHEST /F' (with hidden window)
  • '%WINDIR%\microsoft.net\framework\v4.0.30319\csc.exe' /noconfig /fullpaths @"%TEMP%\iyygbuii.cmdline"' (with hidden window)
  • '%WINDIR%\microsoft.net\framework\v4.0.30319\cvtres.exe' /NOLOGO /READONLY /MACHINE:IX86 "/OUT:%TEMP%\RES863F.tmp" "%ALLUSERSPROFILE%\CSC4FB661CAA6EB436D9A68F477EFA1BC38.TMP"' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C vssadmin delete shadows /all /quiet' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C wbadmin DELETE SYSTEMSTATEBACKUP' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C wmic shadowcopy delete' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C wbadmin delete catalog -quiet' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C bcdedit /set {default} bootstatuspolicy ignoreallfailures' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C bcdedit /set {default} recoveryenabled no' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C netsh advfirewall set currentprofile state off' (with hidden window)
  • '%WINDIR%\syswow64\cmd.exe' /C netsh firewall set opmode mode=disable' (with hidden window)
Executes the following
  • '%WINDIR%\syswow64\cmd.exe' /C schtasks /CREATE /SC ONLOGON /TN Loki /TR %APPDATA%\winlogon.exe /RU SYSTEM /RL HIGHEST /F
  • '%WINDIR%\syswow64\schtasks.exe' /CREATE /SC ONLOGON /TN Loki /TR %APPDATA%\winlogon.exe /RU SYSTEM /RL HIGHEST /F
  • '%WINDIR%\microsoft.net\framework\v4.0.30319\csc.exe' /noconfig /fullpaths @"%TEMP%\iyygbuii.cmdline"
  • '%WINDIR%\microsoft.net\framework\v4.0.30319\cvtres.exe' /NOLOGO /READONLY /MACHINE:IX86 "/OUT:%TEMP%\RES863F.tmp" "%ALLUSERSPROFILE%\CSC4FB661CAA6EB436D9A68F477EFA1BC38.TMP"
  • '%WINDIR%\syswow64\cmd.exe' /C vssadmin delete shadows /all /quiet
  • '%WINDIR%\syswow64\cmd.exe' /C wbadmin DELETE SYSTEMSTATEBACKUP
  • '%WINDIR%\syswow64\cmd.exe' /C wmic shadowcopy delete
  • '%WINDIR%\syswow64\cmd.exe' /C wbadmin delete catalog -quiet
  • '%WINDIR%\syswow64\cmd.exe' /C bcdedit /set {default} bootstatuspolicy ignoreallfailures
  • '%WINDIR%\syswow64\cmd.exe' /C bcdedit /set {default} recoveryenabled no
  • '%WINDIR%\syswow64\cmd.exe' /C netsh advfirewall set currentprofile state off
  • '%WINDIR%\syswow64\cmd.exe' /C netsh firewall set opmode mode=disable
  • '%WINDIR%\syswow64\netsh.exe' advfirewall set currentprofile state off

Curing recommendations

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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);
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