Virus:TR/Dldr.Delf.atx
Date discovered:16/08/2006
Type:Trojan
Subtype:Downloader
In the wild:No
Reported Infections:Low
Distribution Potential:Low
Damage Potential:Low to medium
Static file:Yes
File size:40.448 Bytes
MD5 checksum:c27cb66c2a71916cd48bc729398f4cc4
VDF version:6.35.01.99
IVDF version:6.35.01.100 - Wednesday, August 16, 2006

 General Method of propagation:
   • No own spreading routine


Aliases:
   •  Kaspersky: Trojan-Downloader.Win32.Delf.atx
   •  Bitdefender: BehavesLike:Win32.ExplorerHijack


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


Side effects:
   • Downloads a malicious file
   • Registry modification

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




It tries to download a file:

– The location is the following:
   • http://www.xd530.com/**********
It is saved on the local hard drive under: %temporary internet files%\Content.IE5\%eight-digit random character string%\MSNsetup[1].exe Further investigation pointed out that this file is malware, too.

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

– HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run
   • "system"="intenat.exe"

 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 Marius T. Nicolae on Wednesday, September 13, 2006
Description updated by Marius T. Nicolae on Wednesday, September 13, 2006

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