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Virus:DR/Autoit.WX.25
Date discovered:28/06/2010
Type:Trojan
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:534.500 Bytes
MD5 checksum:a32e6493cb613ed9a41031f9f8b72830
IVDF version:7.10.03.193 - Thursday, February 4, 2010

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Mcafee: W32/Autorun.worm.zf.gen
   •  Bitdefender: Trojan.Generic.4222181
   •  Panda: W32/Harakit.EA
   •  Eset: Win32/Tifaut.D


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Lowers security settings
   • Downloads malicious files
   • Drops malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • %SYSDIR%\csrcs.exe
   • %drive%\gFrjip.eXe



It deletes the following files:
   • %TEMPDIR%\fkyfekh
   • %TEMPDIR%\~ip.tmp
   • %TEMPDIR%\tweviwr
   • %TEMPDIR%\aut4.tmp
   • %TEMPDIR%\aut5.tmp



The following files are created:

%drive%\autorun.inf This is a non malicious text file with the following content:
   • %code that runs malware%

%SYSDIR%\autorun.in
%SYSDIR%\autorun.i
%TEMPDIR%\tweviwr
%TEMPDIR%\fkyfekh
%TEMPDIR%\~ip.tmp
%TEMPDIR%\aut5.tmp
%TEMPDIR%\aut4.tmp



It tries to download some files:

– The location is the following:
   • http://suse.extasix.com:85/**********


– The location is the following:
   • http://www.752b36f4.com/**********




It tries to execute the following file:

– Filename:
   • "%SYSDIR%\csrcs.exe"

 Registry The following registry keys are added in order to run the processes after reboot:

– [HKLM\Software\Microsoft\Windows\CurrentVersion\policies\Explorer\
   Run]
   • "csrcs"="%SYSDIR%\csrcs.exe"



The following registry key is added:

– [HKLM\Software\Microsoft\DRM\amty]
   • "dreg"="408406541BC5BBE4DC197A2A0C46B9ACF2F90D96B151D7C7BCBD177641EE95F562E634D70EB70FB65FC8FBF0EC31261C8626D05B1ED70CC881A48DA07A7E1A99"
   • "exp1"="408406541BC5BBE4DC197A2A0C46B9ACF2F90D96B151D7C7BCBD177741EE95F062E634D70EB70FB65FC8FBF3EC31261C"
   • "fir"="x"
   • "ilop"="1"



The following registry keys are changed:

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\Winlogon]
   New value:
   • "Shell"="Explorer.exe csrcs.exe"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "Hidden"=dword:0x00000002
   • "ShowSuperHidden"=dword:0x00000000
   • "SuperHidden"=dword:0x00000000

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "CheckedValue"=dword:0x00000001

 Miscellaneous  Checks for an internet connection by contacting the following web sites:
   • http://www.whatismyip.com/automation/n09230945.asp
   • http://checkip.dyndns.org


Mutex:
It creates the following Mutex:
   • 6E523163793968624

 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with a runtime packer.

說明撰寫者 Petre Galan 開啟 2010年10月19日星期二
說明更新者 Andrei Ivanes 開啟 2010年10月22日星期五

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