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Virus:TR/Autoit.WM
Date discovered:20/01/2009
Type:Trojan
In the wild:Yes
Reported Infections:Low
Distribution Potential:Low to medium
Damage Potential:Medium
Static file:Yes
File size:545.758 Bytes
MD5 checksum:123834811b7d6f9e1423f381e68d25a6
IVDF version:7.01.01.152 - Tuesday, January 20, 2009

 General Method of propagation:
   • Autorun feature


Aliases:
   •  Symantec: W32.Harakit
   •  Kaspersky: Worm.Win32.AutoIt.xl
   •  TrendMicro: WORM_HARAKIT.FC
   •  Sophos: Sus/Tiotua-A
   •  Avast: AutoIt:Balero-C
   •  Microsoft: Worm:Win32/Autorun.XK
   •  Eset: Win32/Tifaut.D


Platforms / OS:
   • Windows 2000
   • Windows XP
   • Windows 2003
   • Windows Vista
   • Windows Server 2008
   • Windows 7


Side effects:
   • Third party control
   • Downloads malicious files
   • Registry modification

 Files It copies itself to the following locations:
   • %SYSDIR%\csrcs.exe
   • %SYSDIR%\%random character string%.exe
   • C:\%random character string%\%random character string%\%gathered from the internet%.exe
   • %drive%\%random character string%.exe



It copies itself within an archive to the following location:
   • C:\%random character string%\%random character string%\%gathered from the internet%.zip



The following files are created:

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

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

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




It tries to download some files:

– The location is the following:
   • http://95.211.21.184:804/z/****
It is saved on the local hard drive under: %SYSDIR%\cftu.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too.

– The location is the following:
   • http://95.211.21.184:89/****
It is saved on the local hard drive under: %SYSDIR%\RegShellSM.exe Furthermore this file gets executed after it was fully downloaded. Further investigation pointed out that this file is malware, too.

– The location is the following:
   • http://thepiratebay.org/****

 Registry The following registry key is added in order to run the process after reboot:

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



One of the following values is added in order to run the process 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]
   • "exp1"="408406541BC5BBE4DC197A2A0C46B9ACF2F90D96B151D7C7BCBD177741EE95F562E634D70EB70FB65FC8FBF3EC31261F"
   • "dreg"="408406541BC5BBE4DC197A2A0C46B9ACF2F90D96B151D7C7BCBD177641EE95F562E634D70EB70FB65FC8FBF0EC31261C8626D05B1ED70CC881A48DA07A7E1A99"
   • "fir"="x"
   • "kiu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
   • "giru"="noneed"
   • "gix"="noneed"
   • "rp2"="noneed"
   • "cb3"="noneed"
   • "bwp1"="noneed"



The following registry keys are changed:

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

– [HKLM\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   Old value:
   • "CheckedValue"=dword:00000000
   New value:
   • "CheckedValue"=dword:00000001

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   Old value:
   • "Hidden"=dword:00000001
   • "SuperHidden"=dword:00000001
   • "ShowSuperHidden"=dword:00000001
   New value:
   • "Hidden"=dword:00000002
   • "SuperHidden"=dword:00000000
   • "ShowSuperHidden"=dword:00000000

 Backdoor Contact server:
The following:
   • http://www.5eb149c0.com:81/****


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

Description inserted by Irina Diaconescu on Tuesday, October 26, 2010
Description updated by Andrei Ivanes on Monday, November 1, 2010

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