Trojan.Encoder.32100

Technical Information

To ensure autorun and distribution

Modifies the following registry keys

[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'SysHelper' = '"%LOCALAPPDATA%\8601cda0-7919-49ac-8899-c49d02690e78\<File name>.exe" --AutoStart'

Creates or modifies the following files

<SYSTEM32>\tasks\time trigger task

Creates the following files on removable media

<Drive name for removable media>:\000814251_video_01.avi
<Drive name for removable media>:\chromesetup.exe
<Drive name for removable media>:\tcm851ax32.exe
<Drive name for removable media>:\wrar520.exe
<Drive name for removable media>:\february_catalogue__2015.doc
<Drive name for removable media>:\hanni_umami_chapter.doc
<Drive name for removable media>:\508softwareandos.doc
<Drive name for removable media>:\testee.cer
<Drive name for removable media>:\contoso.cer
<Drive name for removable media>:\calc.exe
<Drive name for removable media>:\sdkfailsafeemulator.cer
<Drive name for removable media>:\contoso_1.cer
<Drive name for removable media>:\tileimage.bmp
<Drive name for removable media>:\toolbar.bmp
<Drive name for removable media>:\dashborder_96.bmp
<Drive name for removable media>:\dashborder_192.bmp
<Drive name for removable media>:\dashborder_144.bmp
<Drive name for removable media>:\join.avi
<Drive name for removable media>:\delete.avi
<Drive name for removable media>:\contosoroot.cer
<Drive name for removable media>:\winmine.exe

Malicious functions

To complicate detection of its presence in the operating system,

blocks execution of the following system utilities:

Windows Task Manager (Taskmgr)

Executes the following

'%WINDIR%\syswow64\taskkill.exe' /im 5.exe /f

Terminates or attempts to terminate

the following user processes:

firefox.exe

Reads files which store third party applications passwords

%LOCALAPPDATA%\google\chrome\user data\default\web data

Modifies file system

Creates the following files

%LOCALAPPDATA%\8601cda0-7919-49ac-8899-c49d02690e78\<File name>.exe
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\ld
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\historych
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\wd
%PROGRAMDATA%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\policy.vpol
%PROGRAMDATA%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\3ccd5499-87a8-4b10-a215-608888dd3b55.vsch
%PROGRAMDATA%\microsoft\vault\ac658cb4-9126-49bd-b877-31eedab3f204\2f1a6504-0641-44cf-8bb5-3612d865f2e5.vsch
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\telegram\d877f783d5d3ef8c1
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\screenshot.jpg
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\telegram\map0
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\cookie_list.txt
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\information.txt
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\files\desktop.zip
%TEMP%\mpcmdrun.log
%TEMP%\delself.bat
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\history\history_mozilla firefox_gn7ryp3k.default.txt
%LOCALAPPDATA%\microsoft\vault\4bf4c442-9b8a-41a0-b380-dd4a704ddb28\policy.vpol
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\history-shm
%PROGRAMDATA%\freebl3.dll
%LOCALAPPDATA%\6c7392e1-d9c3-47d1-88b3-7ce665719042\updatewin1.exe
%LOCALAPPDATA%\bowsakkdestx.txt
C:\systemid\personalid.txt
%LOCALAPPDATA%\6c7392e1-d9c3-47d1-88b3-7ce665719042\updatewin2.exe
%LOCALAPPDATA%\6c7392e1-d9c3-47d1-88b3-7ce665719042\5.exe
%LOCALAPPDATA%\script.ps1
%PROGRAMDATA%\mozglue.dll
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\cookies\cookies_mozilla firefox_gn7ryp3k.default.txt
%PROGRAMDATA%\msvcp140.dll
%PROGRAMDATA%\nss3.dll
%PROGRAMDATA%\softokn3.dll
%PROGRAMDATA%\vcruntime140.dll
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\c
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\c-shm
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\history
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\nl_36d1130a-ac2e-44f7-9dc1-e424fbcbe0ee8141624847.zip

Deletes the following files

<SYSTEM32>\tasks\time trigger task
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\telegram\map0
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\telegram\d877f783d5d3ef8c1
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\screenshot.jpg
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\information.txt
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\history\history_mozilla firefox_gn7ryp3k.default.txt
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\files\desktop.zip
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\cookie_list.txt
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\files\cookies\cookies_mozilla firefox_gn7ryp3k.default.txt
%LOCALAPPDATA%\6c7392e1-d9c3-47d1-88b3-7ce665719042\updatewin1.exe
%PROGRAMDATA%\vcruntime140.dll
%PROGRAMDATA%\softokn3.dll
%PROGRAMDATA%\nss3.dll
%PROGRAMDATA%\msvcp140.dll
%PROGRAMDATA%\mozglue.dll
%PROGRAMDATA%\freebl3.dll
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\history-shm
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\c-shm
%PROGRAMDATA%\uu36n8i87nozrb2b9lchgx05v\nl_36d1130a-ac2e-44f7-9dc1-e424fbcbe0ee8141624847.zip
%LOCALAPPDATA%\6c7392e1-d9c3-47d1-88b3-7ce665719042\5.exe

Modifies the HOSTS file.

Changes user data files extensions (Trojan.Encoder).

Network activity

Connects to

'ma####amemories.com':80
'ip##pi.com':80

TCP

HTTP GET requests

http://cj##.top/sgfjsgdfgsgddagdpen4/get.php?pi#############################################
http://cj##.top/files/penelop/updatewin1.exe
http://cj##.top/files/penelop/updatewin2.exe
http://cj##.top/files/penelop/updatewin.exe
http://cj##.top/files/penelop/3.exe
http://cj##.top/files/penelop/4.exe
http://cj##.top/files/penelop/5.exe
http://ma####amemories.com/freebl3.dll
http://ma####amemories.com/mozglue.dll
http://ma####amemories.com/msvcp140.dll
http://ma####amemories.com/nss3.dll
http://ma####amemories.com/softokn3.dll
http://ma####amemories.com/vcruntime140.dll

'ap#.2ip.ua':443

UDP

DNS ASK ap#.2ip.ua
DNS ASK cj##.top
DNS ASK ma####amemories.com
DNS ASK ip##pi.com

Miscellaneous

Searches for the following windows

ClassName: '' WindowName: ''

Creates and executes the following

'%LOCALAPPDATA%\6c7392e1-d9c3-47d1-88b3-7ce665719042\updatewin1.exe'
'%LOCALAPPDATA%\6c7392e1-d9c3-47d1-88b3-7ce665719042\updatewin2.exe'
'%LOCALAPPDATA%\6c7392e1-d9c3-47d1-88b3-7ce665719042\updatewin1.exe' --Admin
'%LOCALAPPDATA%\6c7392e1-d9c3-47d1-88b3-7ce665719042\5.exe'
'%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' -NoProfile -ExecutionPolicy Bypass -Command "& {Start-Process PowerShell -ArgumentList '-NoProfile -ExecutionPolicy Bypass -File ""%LOCALAPPDATA%\script.ps1""' -Verb RunAs}"
'%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' -NoProfile -ExecutionPolicy Bypass -File "%LOCALAPPDATA%\script.ps1
'%LOCALAPPDATA%\8601cda0-7919-49ac-8899-c49d02690e78\<File name>.exe' --Task
'%WINDIR%\syswow64\icacls.exe' "%LOCALAPPDATA%\8601cda0-7919-49ac-8899-c49d02690e78" /deny *S-1-1-0:(OI)(CI)(DE,DC)' (with hidden window)
'%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned' (with hidden window)
'%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' -NoProfile -ExecutionPolicy Bypass -Command "& {Start-Process PowerShell -ArgumentList '-NoProfile -ExecutionPolicy Bypass -File ""%LOCALAPPDATA%\script.ps1""' -Verb RunAs}"' (with hidden window)
'%ProgramFiles%\windows defender\mpcmdrun.exe' -removedefinitions -all' (with hidden window)
'%WINDIR%\syswow64\cmd.exe' /c ""%TEMP%\delself.bat""' (with hidden window)
'%WINDIR%\syswow64\cmd.exe' /c taskkill /im 5.exe /f & erase %LOCALAPPDATA%\6c7392e1-d9c3-47d1-88b3-7ce665719042\5.exe & exit' (with hidden window)
'%LOCALAPPDATA%\8601cda0-7919-49ac-8899-c49d02690e78\<File name>.exe' --Task' (with hidden window)

Executes the following

'%WINDIR%\syswow64\icacls.exe' "%LOCALAPPDATA%\8601cda0-7919-49ac-8899-c49d02690e78" /deny *S-1-1-0:(OI)(CI)(DE,DC)
'%WINDIR%\syswow64\windowspowershell\v1.0\powershell.exe' -Command Set-ExecutionPolicy -Scope CurrentUser RemoteSigned
'%ProgramFiles%\windows defender\mpcmdrun.exe' -removedefinitions -all
'%WINDIR%\syswow64\cmd.exe' /c ""%TEMP%\delself.bat""
'%WINDIR%\syswow64\cmd.exe' /c taskkill /im 5.exe /f & erase %LOCALAPPDATA%\6c7392e1-d9c3-47d1-88b3-7ce665719042\5.exe & exit
'<SYSTEM32>\taskeng.exe' {89B3565B-2A1A-42F2-8763-8D460938C360} S-1-5-21-1960123792-2022915161-3775307078-1001:rxrsvczvms\user:Interactive:[1]

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