Re: New Javascript Packer: JSidle

[Spring Systems <korund () hotmail com>]

Hi,

Just played with custom encoded adobe_flashplayer_newfunction PDF exploit, and find that Kaspersky AV dont allow 
specific operation with SWF file which included in exploit (seems don't allow write operation), I still can open PDF 
file, KAV does not delete file and doesn't flag it as virus.
Is it possible to encode SWF itself?

Regards,
spring


> Date: Mon, 12 Jul 2010 19:30:14 +0200
> From: sven.taute () gmail com
> To: miguelrios35 () yahoo com
> CC: framework () spool metasploit com
> Subject: Re: [framework] New Javascript Packer: JSidle
>
> Thanks for testing. I think it is very difficult to permanently 
> circumvent the detection of malicious javascript in PDF files. In
> contrast to web-based exploits, AV can flag the usage of JS obfuscation
> as malicious, though it does not see the real exploit (therefore the
> "generic" detection).
>
> In the first development phase I only targeted web-based exploits - the
> usage for PDFs was more of a side product.
>
> - Sven
>
>
> On Sun, 11 Jul 2010 10:59:53 -0700 (PDT)
> Miguel Rios <miguelrios35 () yahoo com> wrote:
>
> > Well, just thought I'd share my results with NOD after applying the
> > jsidle patch for new icon adobe exploit. Bottom line, NOD still flags
> > it as PDF/Exploit.Gen. Tried encrypting it also and it did cut down
> > on detections but NOD still flags it as PDF/Exploit.Gen. Seems NOD is
> > doing a pretty good job in flagging malicious PDFs.
> >
> > --- On Sat, 7/10/10, Jonathan R <agentsmith15 () gmail com> wrote:
> >
> > From: Jonathan R <agentsmith15 () gmail com>
> > Subject: Re: [framework] New Javascript Packer: JSidle
> > To: "Miguel Rios" <miguelrios35 () yahoo com>,
> > framework () spool metasploit com Date: Saturday, July 10, 2010, 11:15 PM
> >
> > NOD prides themselves on having one of the best heuristics engines, so
> > I believe NOD would mark the PDF as suspicious and not a specific
> > threat. You can do what many malware writers do and split the PDF into
> > multiple parts and you can narrow the range of where/what in the PDF
> > is getting flagged. Then change things accordingly.
> >
> >
> > This idea of delaying code to bypass detection has been brought up
> > before by well known virus writers like Z0mbie and Second Part To
> > Hell/[rRlf].
> > http://vxheavens.com/lib/vzo23.html   <--- Z0mbie's Paper
> > http://www.hack0wn.com/view.php?xroot=72.0&cat=papers   <--- SPTH/rHlf
> >
> > This is all based upon the fact that a anti virus like Norton or NOD
> > can only spend about 3 or 4 seconds on each file. Otherwise a AV scan
> > would take to long.
> >
> >
> >
> >       
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