Security Incidents mailing list archives
RE: strange windows behaviour.
From: "Schmehl, Paul L" <pauls () utdallas edu>
Date: Wed, 8 Oct 2003 15:44:22 -0500
-----Original Message----- From: J Mike Rollins [mailto:rollins () wfu edu] Sent: Wednesday, October 08, 2003 12:46 PM To: incidents () securityfocus com Subject: Re: strange windows behaviour. One trick that hackers are exploiting is to store executable files as NTFS Streams. You should check you registry for programs set to run at startup with the following format rundll32.exe C:\Some\Directory:trojan.dll The : in front of the trojan signifies that the file is really an NTFS Stream. Trojans stored in this format may not be detected by many virus scanners.
There's been a lot of discussion about this amongst av professionals. There's really no advantage to scanning streams because they are "inert". In order for the trojan to do anything, it has to "come out of hiding" as it were, and when it does, av on access scanning will detect it **if it's a known trojan**. While it's in the stream it's merely in storage, not being used. Paul Schmehl (pauls () utdallas edu) Adjunct Information Security Officer The University of Texas at Dallas AVIEN Founding Member http://www.utdallas.edu/~pauls/ --------------------------------------------------------------------------- ----------------------------------------------------------------------------
Current thread:
- Re: strange windows behaviour., (continued)
- Re: strange windows behaviour. Magosányi Árpád (Oct 09)
- Re: strange windows behaviour. Brian Eckman (Oct 08)
- Re: strange windows behaviour. Fabio Panigatti (Oct 10)
- Re: strange windows behaviour. J Mike Rollins (Oct 10)
- Re: strange windows behaviour. Tomasz Papszun (Oct 10)
- Re: strange windows behaviour. Peter Moody (Oct 08)
- Re: strange windows behaviour. Harlan Carvey (Oct 08)
- RE: strange windows behaviour. J Mike Rollins (Oct 09)
- Re: strange windows behaviour. Jeff Kell (Oct 09)
- Re: strange windows behaviour. J Mike Rollins (Oct 09)
- Re: strange windows behaviour. Tobias Rice (Oct 10)
- Administrivia: strange windows behaviour. Dan Hanson (Oct 09)
- Re: strange windows behaviour. Harlan Carvey (Oct 10)