Trojan.DownLoader4.7135

Technical Information

To ensure autorun and distribution:

Modifies the following registry keys:

[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\Run] '7q47qeh' = '%APPDATA%\0uobg.exe'
[<HKLM>\SOFTWARE\Microsoft\Windows\CurrentVersion\RunOnce] 'GrpConv' = 'grpconv -o'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Run] 'Sxikihuvuw' = 'rundll32.exe "%WINDIR%\dwodbi.dll",Startup'
[<HKLM>\SYSTEM\ControlSet001\Control\Print\Providers\1193168320] 'Name' = '"%TEMP%\5.tmp"'

Creates the following services:

[<HKLM>\SYSTEM\ControlSet001\Services\MouseDriver] 'Start' = '00000002'

Malicious functions:

Creates and executes the following:

%APPDATA%\0uobg.exe
"%TEMP%\hodwarf.exe" (downloaded from the Internet)
"%TEMP%\750234914" (downloaded from the Internet)
"%TEMP%\ukrycny.exe" (downloaded from the Internet)
"%TEMP%\pshha.exe" (downloaded from the Internet)
"%TEMP%\qwutu.exe" (downloaded from the Internet)
"%TEMP%\nohfx.exe" (downloaded from the Internet)
"%TEMP%\iycclejs.exe" (downloaded from the Internet)
"%TEMP%\cpbdrxur.exe" (downloaded from the Internet)
"%TEMP%\xqcwsah.exe" (downloaded from the Internet)
"%TEMP%\yttwulhw.exe" (downloaded from the Internet)
"%TEMP%\mish.exe" (downloaded from the Internet)
"%TEMP%\tcomfpag.exe" (downloaded from the Internet)

Executes the following:

<SYSTEM32>\net1.exe stop "Windows Firewall/Internet Connection Sharing (ICS)"
<SYSTEM32>\rundll32.exe "%WINDIR%\dwodbi.dll",iep
<SYSTEM32>\net1.exe stop "Security Center"
<SYSTEM32>\runonce.exe -r
<SYSTEM32>\cmd.exe /c "%APPDATA%\d5kd6gnb.bat"
<SYSTEM32>\rundll32.exe setupapi,InstallHinfSection DefaultInstall 128 %APPDATA%\mdinstall.inf
<SYSTEM32>\net.exe stop "Security Center"
<SYSTEM32>\rundll32.exe "%WINDIR%\dwodbi.dll",Startup
<SYSTEM32>\svchost.exe
<SYSTEM32>\sc.exe config SharedAccess start= DISABLED
<SYSTEM32>\net.exe stop "Windows Firewall/Internet Connection Sharing (ICS)"
<SYSTEM32>\sc.exe config wscsvc start= DISABLED

Injects code into

the following system processes:

<SYSTEM32>\spoolsv.exe

Modifies settings of Windows Internet Explorer:

[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '1A10' = '00000000'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '{AEBA21FA-782A-4A90-978D-B72164C80120}' = ''
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '{A8A88C49-5EB2-4990-A1A2-0876022C854F}' = ''
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] 'currentlevel' = '00000000'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '1601' = '00000000'
[<HKCU>\Software\Microsoft\Windows\CurrentVersion\Internet Settings\Zones\3] '1400' = '00000000'

Modifies file system :

Creates the following files:

%TEMP%\Rlb..bat
%APPDATA%\0uobg.exe
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\69I9OPW5\dhdhuy[1].php
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\69I9OPW5\qduhhl[1].php
%TEMP%\hodwarf.exe
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\SL6TKFAX\erfjjje[1].php
%TEMP%\yttwulhw.exe
%TEMP%\750234914
%TEMP%\nohfx.exe
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\SL6TKFAX\nnbrswmqa[1].php
%APPDATA%\MouseDriver.bat
%TEMP%\ukrycny.exe
%APPDATA%\mdinstall.inf
%APPDATA%\d5kd6gnb.bat
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\ULU3YH2D\hdqhyyz[1].php
%WINDIR%\Temp\6.tmp
%TEMP%\qwutu.exe
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\0D6B6PI5\xtkkbspt[1].php
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\0D6B6PI5\dnnrvriqm[1].php
%TEMP%\pshha.exe
%TEMP%\nsv3.tmp\IR.exe
%TEMP%\nsv3.tmp\6tbp.exe
%WINDIR%\dwodbi.dll
%TEMP%\xqcwsah.exe
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\69I9OPW5\arboobnkar[1].php
%TEMP%\nsv3.tmp\ic5.exe
%TEMP%\nsq2.tmp
%TEMP%\nsv3.tmp\1EuroP.exe
%TEMP%\nsv3.tmp\3E4U - Bucks.exe
%TEMP%\nsv3.tmp\2IC.exe
%TEMP%\tcomfpag.exe
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\0D6B6PI5\qqqriimq[1].php
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\ULU3YH2D\flcppgggu[1].php
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\ULU3YH2D\sjwxkob[1].php
%TEMP%\mish.exe
%TEMP%\cpbdrxur.exe
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\69I9OPW5\oobbff[1].php
%TEMP%\4.tmp
%TEMP%\iycclejs.exe
%HOMEPATH%\Local Settings\Temporary Internet Files\Content.IE5\0D6B6PI5\ivzqmqd[1].php

Sets the 'hidden' attribute to the following files:

%APPDATA%\MouseDriver.bat

Deletes the following files:

<DRIVERS>\etc\hosts
%TEMP%\5.tmp
%APPDATA%\mdinstall.inf
%WINDIR%\Temp\6.tmp
%TEMP%\nsv3.tmp\IR.exe
%TEMP%\nsv3.tmp\2IC.exe
%TEMP%\nsv3.tmp\1EuroP.exe
%TEMP%\nsv3.tmp\ic5.exe
%TEMP%\nsv3.tmp\3E4U - Bucks.exe

Network activity:

Connects to:

'localhost':1040
'aa###ket.com':80
'bu###ogin.net':80

TCP:

HTTP GET requests:

aa###ket.com/ckkuylpycc/qduhhl.php?ad################################
aa###ket.com/ckkuylpycc/dhdhuy.php?ad################################
aa###ket.com/ckkuylpycc/nnbrswmqa.php?ad################################
aa###ket.com/ckkuylpycc/hdqhyyz.php?ad##############################################################
aa###ket.com/ckkuylpycc/dnnrvriqm.php?ad################################
aa###ket.com/ckkuylpycc/xtkkbspt.php?ad################################
aa###ket.com/ckkuylpycc/erfjjje.php?ad################################
aa###ket.com/ckkuylpycc/ivzqmqd.php?ad################################
aa###ket.com/ckkuylpycc/oobbff.php?ad################################
aa###ket.com/ckkuylpycc/arboobnkar.php?ad################################
aa###ket.com/ckkuylpycc/sjwxkob.php?ad################################
aa###ket.com/ckkuylpycc/flcppgggu.php?ad################################
aa###ket.com/ckkuylpycc/qqqriimq.php?ad################################