Re: IE Malware / Spyware Control Methods

[Harlan Carvey <keydet89 () yahoo com>]

massa, et al, 

>  I'm sure you all realize the growing threat of
> malware and spyware to
> Internet Explorer. It has been my experience that
> the initial
> infection and/or removel of an infection by
> anti-spyware products can
> permanently damage a windows workstation. This
> damage occurs in many
> forms and often leads too the workstation being
> reformatted and
> rebuilt before going back into service.

Having dealt with a great many spyware infections,
I've successfully removed all of those that were
identified with no negative side effects.  I've never
had to have a workstation rebuilt. 

I think that it would behoove the list and this effort
in general if you could be a bit more specific about
the conditions under which a removal damaged a
workstation.  For example, was the removal done by
hand?  If not, and a tool was used, which tool was it,
and which bit of spyware was involved?

> A recent example is earlier this week, in spite of
> content filtering,
> a workstation was infected with "wintools",
> "mysearchtoolbar" etc. The
> tough part of this is that such malware has multiple
> instances/threads
> and renames system files like msconfig to resist
> removal.

Can you be a bit more specific with regards to what
you mean by "system files"?  I'm curious about this,
as many "system files" are protected by Windows File
Protection (WFP) from being modified.  As yet, I'm not
aware of any spyware that disables WFP before
installing itself.

Also, msconfig.exe isn't necessarily considered a
"system file".  

> Often
> IE/Windows is so damaged it's more time effiecient
> to just replace the
> box and rebuild the infected one.

Again, I'm not clear on what you mean by "damaged".  

> My question is this, I'm batting around the idea of
> using Group Policy
> in our Active Directory to  try and choke IE down to
> the point where
> such Malware has trouble installing itself. Has
> anyone here ever tried
> such as this with any degree of success?
>
> Other than Group Policy I'm also considering
> deploying an alternate
> web browser that isnt subject to malware infection
> but doing so
> complicates my patching/reporting routine for our
> security audits.
>
> I look forward to your comments and idea's.

An alternate web browser is definitely a good idea. 
Other than that, knowing how malware/spyware infects a
system via the browser is key when developing your
Group Policy.  For example, BHOs install via specific
Registry keys, as do most malware.  


=====
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Harlan Carvey, CISSP
"Windows Forensics and Incident Recovery"
http://www.windows-ir.com
http://windowsir.blogspot.com
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