Virus:BDS/Delf.aow.29
Date discovered:04/01/2007
Type:Backdoor Server
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Medium
Static file:Yes
File size:1.249.280 Bytes
VDF version:6831705c64296963f7d11a0669ffecf7
IVDF version:6.35.01.100 - Wednesday, August 16, 2006
Engine version:6.35.01.101

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Backdoor.Win32.Delf.aow
   •  Grisoft: BackDoor.Generic3.HPD
   •  Eset: Win32/Delf.NDN
   •  Bitdefender: Backdoor.Delf.AOW


Platforms / OS:
   • Windows 95
   • Windows 98
   • Windows 98 SE
   • Windows NT
   • Windows ME
   • Windows 2000
   • Windows XP
   • Windows 2003


Side effects:
   • Downloads a file
   • Drops files
   • Registry modification
   • Steals information

 Files It copies itself to the following location:
   • %SYSDIR%\LSASS.exe



It deletes the initially executed copy of itself.



The following files are created:

– %SYSDIR%\drivers\oreans32.sys Furthermore it gets executed after it was fully created.
– %malware execution directory%\_DELET~1.BAT Furthermore it gets executed after it was fully created. This batch file is used to delete a file.

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

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_OREANS32]
   • "NextInstance"=dword:00000001

– [HKLM\SYSTEM\CurrentControlSet\Services\oreans32\Security]
   • "Security"=%hex values%

– [HKLM\SYSTEM\CurrentControlSet\Services\WinServerNamx\Security]
   • "Security"=%hex values%

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_OREANS32\0000]
   • "Service"="oreans32"
     "Legacy"=dword:00000001
     "ConfigFlags"=dword:00000000
     "Class"="LegacyDriver"
     "ClassGUID"="{8ECC055D-047F-11D1-A537-0000F8753ED1}"
     "DeviceDesc"="oreans32"

– [HKLM\SYSTEM\CurrentControlSet\Enum\Root\LEGACY_OREANS32\0000\
   Control]
   • "*NewlyCreated*"=dword:00000000
     "ActiveService"="oreans32"

– [HKLM\SYSTEM\CurrentControlSet\Services\oreans32]
   • "Type"=dword:00000001
     "Start"=dword:00000001
     "ErrorControl"=dword:00000001
     "ImagePath"="%SYSDIR%\drivers\oreans32.sys"
     "DisplayName"="oreans32"

– [HKLM\SYSTEM\CurrentControlSet\Services\oreans32\Enum]
   • "0"="Root\\LEGACY_OREANS32\\0000"
     "Count"=dword:00000001
     "NextInstance"=dword:00000001

– [HKLM\SYSTEM\CurrentControlSet\Services\WinServerNamx]
   • "Type"=dword:00000110
     "Start"=dword:00000002
     "ErrorControl"=dword:00000000
     "ImagePath"="%SYSDIR%\LSASS -NetSata"
     "DisplayName"="Windows ServerNamx"
     "ObjectName"="LocalSystem"
     "Description"="%random character string%"

 Backdoor Contact server:
The following:
   • http://www.ip.newying.com/**********

This is done via the HTTP GET request on a PHP script.

 Stealing It tries to steal the following information:
– Windows Product ID

– It uses a network sniffer that checks for the following strings:
   • :$l
   • :.x

 Miscellaneous Mutex:
It creates the following Mutex:
   • 200600227


Anti debugging
It checks if the following program is running:
   • SoftIce


 File details Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
   • InstallShield 2000 stub

Description inserted by Monica Ghitun on Thursday, January 4, 2007
Description updated by Monica Ghitun on Thursday, January 11, 2007

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