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Virus:DR/Autoit.aft.598
Date discovered:23/08/2010
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:534.792 Bytes
MD5 checksum:80b5a47e61b73e49b1e586a501762ac2
IVDF version:7.10.10.244 - Monday, August 23, 2010

 General Methods of propagation:
    Autorun feature
   • Local network


Aliases:
   •  Mcafee: W32/Autorun.worm.zf.gen
   •  Bitdefender: Trojan.Autoit.AKU
   •  Panda: Trj/Autoit.gen
   •  Eset: Win32/Tifaut.D


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


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

 Files It copies itself to the following locations:
   • %SYSDIR%\csrcs.exe
   • %SYSDIR%\79546806.exe
   • %drive%\%six-digit random character string%.exe



It deletes the initially executed copy of itself.



It deletes the following files:
   • %SYSDIR%\acledit.dll
   • %SYSDIR%\aaaamon.dll
   • %TEMPDIR%\aut%letter%.tmp
   • %TEMPDIR%\%seven-digit random character string%
   • %SYSDIR%\aaclient.dll
   • %SYSDIR%\access.cpl
   • %SYSDIR%\$winnt$.inf
   • %SYSDIR%\accwiz.exe
   • %SYSDIR%\aclui.dll
   • %SYSDIR%\6to4svc.dll
   • %SYSDIR%\acctres.dll
   • %SYSDIR%\12520850.cpx
   • %SYSDIR%\activeds.dll
   • %SYSDIR%\12520437.cpx



The following files are created:

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

%SYSDIR%\RegShellSM.exe
%SYSDIR%\autorun.in
%TEMPDIR%\aut%letter%.tmp
%SYSDIR%\autorun.i
%drive%\khx
%TEMPDIR%\%seven-digit random character string%



It tries to download some files:

The location is the following:
   • http://www.fake_trafic_test.vasthost.co.cc/test1/admin/**********?v=%number%&id=%character string%


The location is the following:
   • http://95.211.21.184:89/**********


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


The location is the following:
   • http://www.d01c0a23.com:82/**********




It tries to execute the following files:

Filename:
   • %SYSDIR%\csrcs.exe


Filename:
   • %SYSDIR%\cmd.exe /c net view %IP address%

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

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

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



The value of the following registry key is removed:

–  [HKLM\Software\Microsoft\DRM\amty]
   • fir



The following registry key is added:

[HKLM\Software\Microsoft\DRM\amty]
   • "bwp1"="noneed"
   • "cb3"="noneed"
   • "dreg"="%hex values%"
   • "exp1"="%hex values%"
   • "hkx14"="noneed"
   • "ilop"="1"
   • "p1"="1"
   • "regexp"="-0.903692205091507"
   • "rp2"="noneed"



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

 Network Infection In order to ensure its propagation the malware attemps to connect to other machines as described below.


Exploit:
It makes use of the following Exploit:
– MS05-039 (Vulnerability in Plug and Play)


IP address generation:
It creates random IP addresses while it keeps the first three octets from its own address. Afterwards it tries to establish a connection with the created addresses.

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


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.

Description inserted by Petre Galan on Wednesday, December 15, 2010
Description updated by Petre Galan on Wednesday, December 15, 2010

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