Trojan.DownLoader25.16339

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\RWLN] 'Startup' = 'WLEventStartup'
[<HKLM>\SYSTEM\ControlSet001\Control\Print\Monitors\rupm] 'Driver' = 'ruppm.dll'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\RWLN] 'DllName' = 'RWLN.dll'
[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon\Notify\RWLN] 'Logon' = 'WLEventLogon'

Creates the following services:

[<HKLM>\SYSTEM\ControlSet001\Services\Agent] 'Start' = '00000002'
[<HKLM>\SYSTEM\ControlSet001\Services\Agent] 'ImagePath' = '%WINDIR%\VPDAgent.exe'
[<HKLM>\SYSTEM\ControlSet001\Services\RManService] 'Start' = '00000002'
[<HKLM>\SYSTEM\ControlSet001\Services\RManService] 'ImagePath' = '%ProgramFiles%\Remote Utilities - Host\rutserv.exe'

Malicious functions:

Executes the following:

'<SYSTEM32>\spoolsv.exe'
'%ProgramFiles%\Remote Utilities - Host\Printer\x86\srvinst.exe' install
'%ProgramFiles%\Remote Utilities - Host\Printer\x86\setupdrv.exe' install
'%ProgramFiles%\Remote Utilities - Host\Printer\x86\setupdrv.exe' uninstall
'<SYSTEM32>\cmd.exe' /c ""%ProgramFiles%\Remote Utilities - Host\Printer\x86\install.cmd" "
'%WINDIR%\VPDAgent.exe'
'%ProgramFiles%\Remote Utilities - Host\rfusclient.exe' /tray
'<SYSTEM32>\cmd.exe' /c %TEMP%\killself.bat
'%ProgramFiles%\Remote Utilities - Host\rutserv.exe'
'%ProgramFiles%\Remote Utilities - Host\Printer\x86\srvinst.exe' start
'%ProgramFiles%\Remote Utilities - Host\rutserv.exe' /start
'<SYSTEM32>\msiexec.exe' -Embedding B7E93317059624B22715A3548E710E85
'%ProgramFiles%\Remote Utilities - Host\rutserv.exe' /silentinstall
'<SYSTEM32>\msiexec.exe' /V
'%TEMP%\7ZipSfx.000\installer.exe' /rsetup
'<SYSTEM32>\msiexec.exe' /i "%TEMP%\7ZipSfx.000\geiri_tenging_2.msi" /qn
'%ProgramFiles%\Remote Utilities - Host\rutserv.exe' /firewall
'<SYSTEM32>\ping.exe' localhost
'%ProgramFiles%\Remote Utilities - Host\Printer\x86\srvinst.exe' uninstall
'%ProgramFiles%\Remote Utilities - Host\Printer\x86\srvinst.exe' stop
'%ProgramFiles%\Remote Utilities - Host\rutserv.exe' /printerinstall
'<SYSTEM32>\cmd.exe' /c ""%ProgramFiles%\Remote Utilities - Host\Printer\x86\uninstall.cmd" "

Injects code into

the following system processes:

<SYSTEM32>\spoolsv.exe

Modifies file system:

Creates the following files:

<SYSTEM32>\spool\drivers\w32x86\rupui.dll
<SYSTEM32>\spool\drivers\w32x86\rup.gpd
<SYSTEM32>\spool\drivers\w32x86\rup.ini
<SYSTEM32>\spool\drivers\w32x86\rupui2.exe
%WINDIR%\Installer\{9B149A31-6736-4195-8F11-4FDCF6D84DE1}\en_server_start_85DB64512C79429FA70AC6C0611579DD.exe
%WINDIR%\Installer\{9B149A31-6736-4195-8F11-4FDCF6D84DE1}\en_server_settings_E3BFC76BE38F4CF79D2ED7163B7DECEE.exe
<SYSTEM32>\ruppm.dll
<SYSTEM32>\RWLN.dll
<SYSTEM32>\spool\drivers\w32x86\stdnames_vpd.gpd
<SYSTEM32>\spool\drivers\w32x86\unires_vpd.dll
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\_REGISTRY_USER_NTUSER_S-1-5-19
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\_REGISTRY_USER_NTUSER_S-1-5-18
<SYSTEM32>\spool\drivers\w32x86\unidrv_rup.dll
<SYSTEM32>\spool\drivers\w32x86\rup.lng
<SYSTEM32>\spool\drivers\w32x86\unidrvui_rup.dll
<SYSTEM32>\spool\drivers\w32x86\unidrv_rup.hlp
%WINDIR%\Installer\{9B149A31-6736-4195-8F11-4FDCF6D84DE1}\UNINST_Uninstall_R_3B1E3C8B7D0945898DA82CEEED02F0C7.exe
%ProgramFiles%\Remote Utilities - Host\Printer\x64\ntprint.inf
%ProgramFiles%\Remote Utilities - Host\Printer\x64\unires_vpd.dll
%ProgramFiles%\Remote Utilities - Host\Printer\x64\uninstall.cmd
%ProgramFiles%\Remote Utilities - Host\Printer\x64\install.cmd
%ProgramFiles%\Remote Utilities - Host\Printer\x64\rupui.dll
%ProgramFiles%\Remote Utilities - Host\Printer\x64\ruppm.dll
%ProgramFiles%\Remote Utilities - Host\Printer\x64\unidrvui_rup.dll
%ProgramFiles%\Remote Utilities - Host\Printer\x64\unidrv_rup.dll
%WINDIR%\Installer\20af7.msi
%ProgramFiles%\Remote Utilities - Host\Printer\x64\unidrv_rup.hlp
%WINDIR%\Installer\{9B149A31-6736-4195-8F11-4FDCF6D84DE1}\en_server_stop_B603677802D142C98E7A415B72132E14.exe
%WINDIR%\Installer\{9B149A31-6736-4195-8F11-4FDCF6D84DE1}\ARPPRODUCTICON.exe
%ProgramFiles%\Remote Utilities - Host\Printer\x64\stdnames_vpd.gpd
%ProgramFiles%\Remote Utilities - Host\Printer\x64\rup.gpd
%ProgramFiles%\Remote Utilities - Host\Printer\x64\rup_s.lng
%ProgramFiles%\Remote Utilities - Host\Printer\x64\rup.lng
<SYSTEM32>\spool\drivers\w32x86\3\New\rup.gpd
<SYSTEM32>\spool\drivers\w32x86\3\New\unidrvui_rup.dll
<SYSTEM32>\spool\drivers\w32x86\3\New\rupui.dll
<SYSTEM32>\spool\drivers\w32x86\3\New\unidrv_rup.hlp
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\Repository\FS\OBJECTS.DATA
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\Repository\FS\MAPPING2.MAP
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\Repository\FS\OBJECTS.MAP
<SYSTEM32>\spool\drivers\w32x86\3\New\unidrv_rup.dll
<SYSTEM32>\spool\drivers\w32x86\3\rup.BUD
<SYSTEM32>\spool\drivers\w32x86\3\New\unires_vpd.dll
%ProgramFiles%\Remote Utilities - Host\Logs\rms_log_2017-08.html
%WINDIR%\VPDAgent.exe
<SYSTEM32>\spool\drivers\w32x86\3\New\rupui2.exe
<SYSTEM32>\spool\drivers\w32x86\3\New\rup.ini
<SYSTEM32>\spool\drivers\w32x86\3\New\stdnames_vpd.gpd
<SYSTEM32>\spool\drivers\w32x86\3\New\rup.lng
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\Repository\FS\MAPPING1.MAP
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\_REGISTRY_USER_.DEFAULT
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\_REGISTRY_USER_USRCLASS_S-1-5-21-2052111302-484763869-725345543-1003
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\_REGISTRY_MACHINE_SOFTWARE
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\_REGISTRY_MACHINE_SECURITY
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\_REGISTRY_USER_NTUSER_S-1-5-20
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\_REGISTRY_USER_USRCLASS_S-1-5-19
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\_REGISTRY_USER_NTUSER_S-1-5-21-2052111302-484763869-725345543-1003
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\_REGISTRY_USER_USRCLASS_S-1-5-20
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\Repository\FS\INDEX.BTR
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\Repository\$WinMgmt.CFG
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\Repository\FS\MAPPING.VER
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\Repository\FS\INDEX.MAP
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\_REGISTRY_MACHINE_SAM
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\_REGISTRY_MACHINE_SYSTEM
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\domain.txt
C:\System Volume Information\_restore{E7F0F64C-F7E5-4319-8757-E9A20C1C4E14}\RP16\snapshot\ComDb.Dat
%ProgramFiles%\Remote Utilities - Host\Printer\x64\VPDAgent_x64.exe
%ProgramFiles%\Remote Utilities - Host\Spanish.lg
%ProgramFiles%\Remote Utilities - Host\EULA.rtf
%ProgramFiles%\Remote Utilities - Host\Turkish.lg
%ProgramFiles%\Remote Utilities - Host\Hebrew.lg
%ProgramFiles%\Remote Utilities - Host\English.lg
%ProgramFiles%\Remote Utilities - Host\rutserv.exe
%ProgramFiles%\Remote Utilities - Host\RIPCServer.dll
%ProgramFiles%\Remote Utilities - Host\RWLN.dll
%ProgramFiles%\Remote Utilities - Host\ChineseS.lg
%ProgramFiles%\Remote Utilities - Host\Arabic.lg
%ProgramFiles%\Remote Utilities - Host\Czech.lg
%ProgramFiles%\Remote Utilities - Host\ChineseT.lg
%ProgramFiles%\Remote Utilities - Host\Japanese.lg
%ProgramFiles%\Remote Utilities - Host\Polish.lg
%ProgramFiles%\Remote Utilities - Host\German.lg
%ProgramFiles%\Remote Utilities - Host\French.lg
%ProgramFiles%\Remote Utilities - Host\webmmux.dll
%APPDATA%\Microsoft\CryptnetUrlCache\MetaData\94308059B57B3142E455B38A6EB92015
%APPDATA%\Microsoft\CryptnetUrlCache\Content\2BF68F4714092295550497DD56F57004
%WINDIR%\Installer\MSI7.tmp
%APPDATA%\Microsoft\CryptnetUrlCache\Content\94308059B57B3142E455B38A6EB92015
%TEMP%\7ZipSfx.000\installer.exe
%TEMP%\7ZipSfx.000\geiri_tenging_2.msi
%APPDATA%\Microsoft\CryptnetUrlCache\MetaData\2BF68F4714092295550497DD56F57004
%WINDIR%\Installer\20af3.msi
%ProgramFiles%\Remote Utilities - Host\webmvorbisdecoder.dll
%ProgramFiles%\Remote Utilities - Host\webmvorbisencoder.dll
%ProgramFiles%\Remote Utilities - Host\vp8decoder.dll
%ProgramFiles%\Remote Utilities - Host\vp8encoder.dll
%WINDIR%\Installer\MSI8.tmp
%WINDIR%\Installer\20af5.ipi
%ProgramFiles%\Remote Utilities - Host\rfusclient.exe
C:\Config.Msi\20af6.rbs
%ProgramFiles%\Remote Utilities - Host\Printer\x86\rup.gpd
%ProgramFiles%\Remote Utilities - Host\Printer\x86\uninstall.cmd
%ProgramFiles%\Remote Utilities - Host\Printer\x86\rup.lng
%ProgramFiles%\Remote Utilities - Host\Printer\x86\stdnames_vpd.gpd
%ProgramFiles%\Remote Utilities - Host\Printer\x86\unires_vpd.dll
%ProgramFiles%\Remote Utilities - Host\Printer\x86\unidrvui_rup.dll
%ProgramFiles%\Remote Utilities - Host\Printer\x86\install.cmd
%ProgramFiles%\Remote Utilities - Host\Printer\x86\ntprint.inf
%ProgramFiles%\Remote Utilities - Host\Printer\x64\rupui2.exe
%ProgramFiles%\Remote Utilities - Host\Printer\x64\progress.exe
%ProgramFiles%\Remote Utilities - Host\Printer\x64\srvinst_x64.exe
%ProgramFiles%\Remote Utilities - Host\Printer\x64\setupdrv.exe
%ProgramFiles%\Remote Utilities - Host\Printer\x86\unidrv_rup.hlp
%ProgramFiles%\Remote Utilities - Host\Printer\x86\rup_s.lng
%ProgramFiles%\Remote Utilities - Host\Printer\x64\fwproc_x64.exe
%ProgramFiles%\Remote Utilities - Host\Printer\x64\rup.ini
%ProgramFiles%\Remote Utilities - Host\Printer\x86\unidrv_rup.dll
%ProgramFiles%\Remote Utilities - Host\Danish.lg
%ProgramFiles%\Remote Utilities - Host\Swedish.lg
%ProgramFiles%\Remote Utilities - Host\Printer\x86\rup.ini
%ProgramFiles%\Remote Utilities - Host\Portuguese-Brazilian.lg
%ProgramFiles%\Remote Utilities - Host\Italian.lg
%ProgramFiles%\Remote Utilities - Host\Dutch.lg
%ProgramFiles%\Remote Utilities - Host\Norwegian.lg
%ProgramFiles%\Remote Utilities - Host\Korean.lg
%ProgramFiles%\Remote Utilities - Host\Printer\x86\VPDAgent.exe
%ProgramFiles%\Remote Utilities - Host\Printer\x86\srvinst.exe
%ProgramFiles%\Remote Utilities - Host\Printer\x86\rupui.dll
%ProgramFiles%\Remote Utilities - Host\Printer\x86\ruppm.dll
%ProgramFiles%\Remote Utilities - Host\Printer\x86\progress.exe
%ProgramFiles%\Remote Utilities - Host\Printer\x86\fwproc.exe
%ProgramFiles%\Remote Utilities - Host\Printer\x86\setupdrv.exe
%ProgramFiles%\Remote Utilities - Host\Printer\x86\rupui2.exe

Deletes the following files:

<SYSTEM32>\spool\drivers\w32x86\unidrv_rup.dll
<SYSTEM32>\spool\drivers\w32x86\unidrv_rup.hlp
<SYSTEM32>\spool\drivers\w32x86\unires_vpd.dll
<SYSTEM32>\spool\drivers\w32x86\rupui2.exe
<SYSTEM32>\spool\drivers\w32x86\stdnames_vpd.gpd
<SYSTEM32>\spool\drivers\w32x86\unidrvui_rup.dll
%WINDIR%\Installer\20af5.ipi
%TEMP%\7ZipSfx.000\installer.exe
%TEMP%\7ZipSfx.000\geiri_tenging_2.msi
%WINDIR%\Installer\MSI8.tmp
C:\Config.Msi\20af6.rbs
%WINDIR%\Installer\20af3.msi
%WINDIR%\Installer\MSI7.tmp
%TEMP%\CabA.tmp
%TEMP%\CabC.tmp
%TEMP%\Cab1.tmp
%TEMP%\Cab3.tmp
%TEMP%\Cab5.tmp
<SYSTEM32>\spool\drivers\w32x86\rup.ini
<SYSTEM32>\spool\drivers\w32x86\rup.lng
<SYSTEM32>\spool\drivers\w32x86\rupui.dll
%TEMP%\CabE.tmp
%TEMP%\Cab10.tmp
<SYSTEM32>\spool\drivers\w32x86\rup.gpd

Moves the following files:

from <SYSTEM32>\spool\drivers\w32x86\3\New\rupui2.exe to <SYSTEM32>\spool\drivers\w32x86\3\rupui2.exe
from <SYSTEM32>\spool\drivers\w32x86\3\New\rup.ini to <SYSTEM32>\spool\drivers\w32x86\3\rup.ini
from <SYSTEM32>\spool\drivers\w32x86\3\New\rup.lng to <SYSTEM32>\spool\drivers\w32x86\3\rup.lng
from <SYSTEM32>\spool\drivers\w32x86\3\New\unires_vpd.dll to <SYSTEM32>\spool\drivers\w32x86\3\unires_vpd.dll
from <SYSTEM32>\spool\drivers\w32x86\3\New\stdnames_vpd.gpd to <SYSTEM32>\spool\drivers\w32x86\3\stdnames_vpd.gpd
from <SYSTEM32>\spool\drivers\w32x86\3\New\unidrvui_rup.dll to <SYSTEM32>\spool\drivers\w32x86\3\unidrvui_rup.dll
from <SYSTEM32>\spool\drivers\w32x86\3\New\unidrv_rup.dll to <SYSTEM32>\spool\drivers\w32x86\3\unidrv_rup.dll
from <SYSTEM32>\spool\drivers\w32x86\3\New\rup.gpd to <SYSTEM32>\spool\drivers\w32x86\3\rup.gpd
from <SYSTEM32>\spool\drivers\w32x86\3\New\rupui.dll to <SYSTEM32>\spool\drivers\w32x86\3\rupui.dll
from <SYSTEM32>\spool\drivers\w32x86\3\New\unidrv_rup.hlp to <SYSTEM32>\spool\drivers\w32x86\3\unidrv_rup.hlp

Network activity:

Connects to:

'www.download.windowsupdate.com':80
'ru##ls.com':80
'wp#d':80
'ca#####.digicert.com':80

TCP:

HTTP GET requests:

http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab
http://ca#####.digicert.com/DigiCertSHA2AssuredIDCodeSigningCA.crt
http://ru##ls.com/utils/inet_id_notify.php?te####
http://11#.#11.111.1/wpad.dat via wp#d
http://ca#####.digicert.com/DigiCertAssuredIDRootCA.crt
http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootseq.txt

UDP:

DNS ASK www.download.windowsupdate.com
DNS ASK ru##ls.com
DNS ASK wp#d
DNS ASK ca#####.digicert.com

Miscellaneous:

Searches for the following windows:

ClassName: 'Shell_TrayWnd' WindowName: ''

Technologies

Terminology

Training and education

Myths

Technical Information

Curing recommendations

Free trial