Trojan.Encoder.38761

Technical Information

To ensure autorun and distribution

Modifies the following registry keys

[HKLM\Software\Classes\BlackBit\shell\open\command] '' = '%ALLUSERSPROFILE%\5cv2ji1b.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\blackbit

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.blackbit
<Drive name for removable media>:\elvisimp.rdf
<Drive name for removable media>:\taxus_baccata.rdf
<Drive name for removable media>:\hypothyroidism_slides.pptx
<Drive name for removable media>:\roozenedowebinar.pptx
<Drive name for removable media>:\iso27k_isms_implementation_and_certification_process_overview_v2.pptx
<Drive name for removable media>:\waterresourcesag.pptx
<Drive name for removable media>:\gruenspecht_02172016.pptx
<Drive name for removable media>:\middaugh_keynote.pptx
<Drive name for removable media>:\stoc13_ml_quoc_le.pptx
<Drive name for removable media>:\metac.ppt
<Drive name for removable media>:\sacs_presentation_sacs_qep_improving_rt_education_final.ppt
<Drive name for removable media>:\20140114.rdf
<Drive name for removable media>:\writingcompletesarnarrative_1103.ppt
<Drive name for removable media>:\cbz.png
<Drive name for removable media>:\arrow-down.png
<Drive name for removable media>:\breakpoint.png
<Drive name for removable media>:\dissolveanother.png
<Drive name for removable media>:\calibre.png
<Drive name for removable media>:\block.png
<Drive name for removable media>:\background.png
<Drive name for removable media>:\tunpersonalca1.pem
<Drive name for removable media>:\delongcacert.pem
<Drive name for removable media>:\lom602.pdf
<Drive name for removable media>:\2015-02-worms-nanoparticle-toxicity.pdf
<Drive name for removable media>:\accountsreceivable.ppt
<Drive name for removable media>:\removedtitles_records.xls
<Drive name for removable media>:\calculatorworksheet.zip
<Drive name for removable media>:\schema.rdf
<Drive name for removable media>:\1sm_price.zip
<Drive name for removable media>:\removedtitles_records.zip
<Drive name for removable media>:\contractualdeadlines.zip
<Drive name for removable media>:\fiche_inscription_2015.zip
<Drive name for removable media>:\national_autism_preparation_programs.xlsx
<Drive name for removable media>:\al.xlsx
<Drive name for removable media>:\2013_finalsummaryforweb.xlsx
<Drive name for removable media>:\trtf_matrix2012_oct.xlsx
<Drive name for removable media>:\applicant.xlsx
<Drive name for removable media>:\disclosuredetails.xlsx
<Drive name for removable media>:\highly_cited_2001.xlsx
<Drive name for removable media>:\ff_ot_user_guide.pdf
<Drive name for removable media>:\cee_mmsprogram_summary_public.xlsx
<Drive name for removable media>:\fiche_inscription_2015.xls
<Drive name for removable media>:\price030215.xls
<Drive name for removable media>:\productos.xls
<Drive name for removable media>:\1sm_price.xls
<Drive name for removable media>:\babyboymaintoscenesbackground_pal.wmv
<Drive name for removable media>:\flower_trans_matte.wmv
<Drive name for removable media>:\router_manual.rtf
<Drive name for removable media>:\military_callsigns_0311.rtf
<Drive name for removable media>:\fungalnameauthors.rtf
<Drive name for removable media>:\pubnet_855.rtf
<Drive name for removable media>:\digest.rdf
<Drive name for removable media>:\sioc.rdf
<Drive name for removable media>:\skos.rdf
<Drive name for removable media>:\10thingscondoms.pdf
<Drive name for removable media>:\sdszfo.docx
<Drive name for removable media>:\issi2013_template_for_posters.docx
<Drive name for removable media>:\nwfieldnotes1966.docx
<Drive name for removable media>:\glidescope_review_rev_010.docx
<Drive name for removable media>:\fi51.doc
<Drive name for removable media>:\february_catalogue__2015.doc
<Drive name for removable media>:\cveuropeo.doc
<Drive name for removable media>:\ovp25012015.doc
<Drive name for removable media>:\508softwareandos.doc
<Drive name for removable media>:\sdksampleprivdeveloper.cer
<Drive name for removable media>:\contoso.cer
<Drive name for removable media>:\sdkfailsafeemulator.cer
<Drive name for removable media>:\file_p_00000000_1371597592.docx
<Drive name for removable media>:\testcertificate.cer
<Drive name for removable media>:\contosoroot.cer
<Drive name for removable media>:\contoso_1.cer
<Drive name for removable media>:\dashborder_120.bmp
<Drive name for removable media>:\dialmap.bmp
<Drive name for removable media>:\toolbar.bmp
<Drive name for removable media>:\dashborder_96.bmp
<Drive name for removable media>:\dashborder_144.bmp
<Drive name for removable media>:\split.avi
<Drive name for removable media>:\join.avi
<Drive name for removable media>:\correct.avi
<Drive name for removable media>:\restore-my-files.txt
<Drive name for removable media>:\pmd.cer
<Drive name for removable media>:\1189.jpeg
<Drive name for removable media>:\video.mp4
<Drive name for removable media>:\trivial-merge.htm
<Drive name for removable media>:\d0068197bb5a41fea16a220c45390606.mp4
<Drive name for removable media>:\51.mp4
<Drive name for removable media>:\scan.mov
<Drive name for removable media>:\firefly1.mov
<Drive name for removable media>:\210252809.jpg
<Drive name for removable media>:\3.jpg
<Drive name for removable media>:\13.jpg
<Drive name for removable media>:\region-north-karelia.jpg
<Drive name for removable media>:\parnas_01.jpeg
<Drive name for removable media>:\4f0bf7ff71f28.jpeg
<Drive name for removable media>:\region-north-karelia.jpeg
<Drive name for removable media>:\video_1.mp4
<Drive name for removable media>:\2.jpeg
<Drive name for removable media>:\howto-index.html
<Drive name for removable media>:\trivial-merge.html
<Drive name for removable media>:\iisstart.html
<Drive name for removable media>:\api-hashmap.html
<Drive name for removable media>:\alert.html
<Drive name for removable media>:\ituneshelpunavailable.html
<Drive name for removable media>:\about.htm
<Drive name for removable media>:\advice_process.htm
<Drive name for removable media>:\iisstart.htm
<Drive name for removable media>:\tree_view.htm
<Drive name for removable media>:\garden.htm
<Drive name for removable media>:\adhd_and_obesity.docx
<Drive name for removable media>:\productos.zip

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' advfirewall set currentprofile state off
'%WINDIR%\syswow64\netsh.exe' firewall set opmode mode=disable

Modifies file system

Creates the following files

%APPDATA%\winlogon.exe
C:\users\public\libraries\restore-my-files.txt
C:\users\public\downloads\restore-my-files.txt
C:\users\public\documents\restore-my-files.txt
C:\users\public\desktop\restore-my-files.txt
C:\users\default\restore-my-files.txt
C:\restore-my-files.txt
D:\restore-my-files.txt
%ALLUSERSPROFILE%\cpriv.blackbit
%HOMEPATH%\music\cpriv.blackbit
%HOMEPATH%\videos\cpriv.blackbit
%HOMEPATH%\pictures\cpriv.blackbit
%HOMEPATH%\documents\cpriv.blackbit
%HOMEPATH%\desktop\cpriv.blackbit
C:\users\public\music\restore-my-files.txt
%APPDATA%\microsoft\windows\recent\cpriv.blackbit
D:\cpriv.blackbit
C:\cpriv.blackbit
%ALLUSERSPROFILE%\info.blackbit
%ALLUSERSPROFILE%\5cv2ji1b.exe
%TEMP%\res1989.tmp
%ALLUSERSPROFILE%\csc1988.tmp
%TEMP%\tk2wgfgy.out
%TEMP%\tk2wgfgy.cmdline
%TEMP%\tk2wgfgy.0.cs
%TEMP%\2hjwzgj0.ico
%WINDIR%\winlogon.exe
%ALLUSERSPROFILE%\microsoft\windows\start menu\programs\startup\winlogon.exe
%ALLUSERSPROFILE%\winlogon.exe
%HOMEPATH%\favorites\cpriv.blackbit
C:\users\public\music\sample music\restore-my-files.txt

Sets the 'hidden' attribute to the following files

%APPDATA%\winlogon.exe
%ALLUSERSPROFILE%\winlogon.exe
%WINDIR%\winlogon.exe
%ALLUSERSPROFILE%\5cv2ji1b.exe

Deletes the following files

%TEMP%\res1989.tmp
%ALLUSERSPROFILE%\csc1988.tmp
%TEMP%\tk2wgfgy.0.cs
%TEMP%\tk2wgfgy.out
%TEMP%\tk2wgfgy.cmdline

Modifies the following files

D:\install.log
<Drive name for removable media>:\contosoroot.cer
<Drive name for removable media>:\contoso_1.cer
<Drive name for removable media>:\dashborder_120.bmp
C:\users\public\libraries\recordedtv.library-ms
<Drive name for removable media>:\dialmap.bmp
<Drive name for removable media>:\toolbar.bmp
<Drive name for removable media>:\dashborder_96.bmp
C:\users\public\libraries\desktop.ini
C:\users\public\downloads\desktop.ini
C:\users\public\documents\desktop.ini
C:\users\public\desktop\steam.lnk
C:\users\public\desktop\opera.lnk
C:\users\public\desktop\mozilla thunderbird.lnk
C:\users\public\desktop\firefox.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
<Drive name for removable media>:\dashborder_144.bmp
<Drive name for removable media>:\split.avi
C:\users\default\ntuser.dat{016888bd-6c6f-11de-8d1d-001e0bcde3ec}.tmcontainer00000000000000000001.regtrans-ms
<Drive name for removable media>:\join.avi
C:\users\default\ntuser.dat{016888bd-6c6f-11de-8d1d-001e0bcde3ec}.tm.blf
<Drive name for removable media>:\correct.avi
C:\users\default\ntuser.dat.log2
C:\users\default\ntuser.dat.log1
C:\users\default\ntuser.dat.log
C:\users\default\ntuser.dat
<Drive name for removable media>:\pmd.cer
<Drive name for removable media>:\testcertificate.cer

Modifies multiple files.

Modifies user data files (Trojan.Encoder).

Network activity

Connects to

'<LOCALNET>.2.1':445
'<LOCALNET>.2.1':139
'62.##3.61.53':80

TCP

HTTP POST requests

http://62.##3.61.53/api/index.php

UDP

'localhost':58150
'localhost':57599

Miscellaneous

Creates and executes the following

'%WINDIR%\syswow64\cmd.exe' /C schtasks /CREATE /SC ONLOGON /TN BlackBit /TR %APPDATA%\winlogon.exe /RU SYSTEM /RL HIGHEST /F' (with hidden window)
'%WINDIR%\microsoft.net\framework\v4.0.30319\csc.exe' /noconfig /fullpaths @"%TEMP%\tk2wgfgy.cmdline"' (with hidden window)
'%WINDIR%\microsoft.net\framework\v4.0.30319\cvtres.exe' /NOLOGO /READONLY /MACHINE:IX86 "/OUT:%TEMP%\RES1989.tmp" "%ALLUSERSPROFILE%\CSC1988.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 BlackBit /TR %APPDATA%\winlogon.exe /RU SYSTEM /RL HIGHEST /F
'%WINDIR%\syswow64\schtasks.exe' /CREATE /SC ONLOGON /TN BlackBit /TR %APPDATA%\winlogon.exe /RU SYSTEM /RL HIGHEST /F
'%WINDIR%\microsoft.net\framework\v4.0.30319\csc.exe' /noconfig /fullpaths @"%TEMP%\tk2wgfgy.cmdline"
'%WINDIR%\microsoft.net\framework\v4.0.30319\cvtres.exe' /NOLOGO /READONLY /MACHINE:IX86 "/OUT:%TEMP%\RES1989.tmp" "%ALLUSERSPROFILE%\CSC1988.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

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