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Virus:Worm/Conficker.Z.32
Date discovered:17/08/2009
Type:Worm
In the wild:Yes
Reported Infections:Low to medium
Distribution Potential:Low to medium
Damage Potential:Low to medium
Static file:Yes
File size:164.746 Bytes
MD5 checksum:87136c488903474630369e232704fa4d
VDF version:7.01.05.118
IVDF version:7.01.05.119 - Monday, August 17, 2009

 General Methods of propagation:
   • Autorun feature
   • Local network


Aliases:
   •  Mcafee: W32/Conficker.worm.gen.a
   •  Bitdefender: Win32.Worm.Downadup.Gen
   •  Panda: W32/Conficker.C.worm
   •  Eset: Win32/Conficker.AA


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


Side effects:
   • Drops malicious files
   • Lowers security settings
   • Registry modification
   • Makes use of software vulnerability
      •  CVE-2007-1204
      •  MS07-019

 Files It copies itself to the following locations:
   • %SYSDIR%\qepdjla.dll
   • %drive%\RECYCLER\%CLSID%\jwgkvsq.vmx



It deletes the initially executed copy of itself.



The following file is created:

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




It tries to execute the following file:

– Filename:
   • explorer C:

 Registry The following registry keys are added in order to load the service after reboot:

– [HKLM\SYSTEM\CurrentControlSet\Services\
   %random character string%]
   • "Description"="Provides automatic configuration for the 802.11 adapters"
   • "DisplayName"="Config Support"
   • "ErrorControl"=dword:0x00000000
   • "ImagePath"="%SystemRoot%\system32\svchost.exe -k netsvcs"
   • "ObjectName"="LocalSystem"
   • "Start"=dword:0x00000002
   • "Type"=dword:0x00000020



The value of the following registry key is removed:

–  [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run]
   • Windows Defender



It creates the following entry in order to bypass the Windows XP firewall:

– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Parameters\
   FirewallPolicy\StandardProfile\GloballyOpenPorts\List]
   • "8182:TCP"="8182:TCP:*:Enabled:opijcn"



The following registry key is added:

– [HKLM\SYSTEM\CurrentControlSet\Services\
   %random character string%\Parameters]
   • "ServiceDll"="%SYSDIR%\qepdjla.dll"



The following registry keys are changed:

– [HKCU\Software\Microsoft\Internet Explorer\Toolbar]
   New value:
   • "Locked"=dword:0x00000001

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer\Advanced]
   New value:
   • "DontPrettyPath"=dword:0x00000000
   • "Filter"=dword:0x00000000
   • "Hidden"=dword:0x00000002
   • "HideFileExt"=dword:0x00000000
   • "HideIcons"=dword:0x00000000
   • "MapNetDrvBtn"=dword:0x00000001
   • "SeparateProcess"=dword:0x00000001
   • "ShowCompColor"=dword:0x00000001
   • "ShowInfoTip"=dword:0x00000000
   • "SuperHidden"=dword:0x00000000
   • "WebView"=dword:0x00000000

– [HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\Advanced\
   Folder\Hidden\SHOWALL]
   New value:
   • "CheckedValue"=dword:0x00000000

– [HKLM\SOFTWARE\Microsoft\Windows NT\CurrentVersion\SvcHost]
   New value:
   • "netsvcs"="6to4"

– [HKCU\Software\Microsoft\Windows\CurrentVersion\Explorer]
   New value:
   • "ShellState"=hex:24,00,00,00,32,04,00,00,00,00,00,00,00,00,00,00,00,00,00,00,01,00,00,00,0D,00,00,00,00,00,00,00,01,00,00,00

– [HKEY_USERS\.DEFAULT\Software\Microsoft\Windows NT\CurrentVersion\
   Winlogon]
   New value:
   • "ParseAutoexec"="1"

– [HKLM\SYSTEM\CurrentControlSet\Services\SharedAccess\Epoch]
   New value:
   • "Epoch"=dword:0x00000030

 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 Exploits:
– MS04-007 (ASN.1 Vulnerability)
– MS06-040 (Vulnerability in Server Service)


Remote execution:
–It attempts to schedule a remote execution of the malware, on the newly infected machine. Therefore it uses the NetScheduleJobAdd function.

 Injection – It injects a backdoor routine into a process.

    Process name:
   • svchost.exe


 Miscellaneous  Checks for an internet connection by contacting the following web site:
   • http://www.whatismyip.org


Mutex:
It creates the following Mutexes:
   • %random character string%
   • %random character string%

 File details Programming language:
The malware program was written in MS Visual C++.


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3月22日星期一
說明更新者 Petre Galan 開啟 2011年2月3日星期四

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