Virus:TR/Drop.Delf.YX
Date discovered:04/01/2007
Type:Trojan
Subtype:Dropper
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:109.056 Bytes
MD5 checksum:7084ec1ce75b6a3521df3e224d5421c7
VDF version:6.35.01.100
IVDF version:6.35.01.101

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-Dropper.Win32.Delf.yx
   •  Sophos: Troj/Delf-DKS
   •  Grisoft: Dropper.Generic.GKO
   •  Eset: Win32/TrojanDropper.Delf.YX
   •  Bitdefender: Trojan.Downloader.Delf.ST


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


Side effects:
   • Drops malicious files
   • Registry modification

 Files The following files are created:

– %SYSDIR%\_LoadPlugin.exe Further investigation pointed out that this file is malware, too. Detected as: TR/Delphi.Downloader.Gen

– %SYSDIR%\LoadPlugin.exe Furthermore it gets executed after it was fully created. Further investigation pointed out that this file is malware, too. Detected as: TR/Delphi.Downloader.Gen

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

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

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

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

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

– [HKLM\SYSTEM\CurrentControlSet\Services\ClipBoard]
   • "Type"=dword:00000010
     "Start"=dword:00000002
     "ErrorControl"=dword:00000001
     "ImagePath"="%SYSDIR%\LoadPlugin.exe"
     "DisplayName"="ClipBoard"
     "ObjectName"="LocalSystem"

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

 File details Programming language:
 The malware program was written in Delphi.


Runtime packer:
In order to aggravate detection and reduce size of the file it is packed with the following runtime packer:
   • ASPack 2.12

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

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