Re: [Emerging-Sigs] Malicious swf sig

[Will Metcalf <william.metcalf () gmail com>]

Will check into those on the ET side. For some reason I think I've seen
leading dir sometimes could be wrong though..

Regards,

Will

On Wed, Dec 10, 2014 at 1:09 PM, James Lay <jlay () slave-tothe-box net> wrote:

> On 2014-12-10 11:11 AM, Shefferman, Ian wrote:
>
> > So far I've seen these Flash files used primarily (and probably
> > solely) to redirect to Angler exploit kit "32x32" gates. A typical
> > chain is as follows:
> >
> > (Source: http://malware-traffic-analysis.net/2014/10/30/index.html)
> >
> > GET kj-invest.com/2de96bd378d6e6614297e27284fdb335.swf
> > POST
> >
> > newfamilynutrition.com/c9e9975e0f51af3ce1354090fb303d8e.php?q=
> > 87086c5336208ce7836edca90ecc8d25
> > # this POST request is made by the SWF
> > GET qwe.leucaenaleucocephalaporno.net/7xibe37z48 # actual Angler EK
> > GET
> >
> > qwe.leucaenaleucocephalaporno.net/4PJOZWsxU4AMjReTBUSHArovOS32pW
> > Lvpt0cwm0sEion8J7ahaP62dkHtp-auIWi
> >
> > The SWF receives parameters dynamically through HTML param attributes
> > to determine where to redirect.
> >
> > -----Original Message-----
> > From: emerging-sigs-bounces () lists emergingthreats net
> > [mailto:emerging-sigs-bounces () lists emergingthreats net] On Behalf Of
> > James Lay
> > Sent: Wednesday, December 10, 2014 11:27 AM
> > To: Snort-sigs; Emerging
> > Subject: [Emerging-Sigs] Malicious swf sig
> >
> > Didn't see this in current sets, so here goes. Seen this in the
> > wild...attaching as an image for safety.  The Shockwave file does a
> > simple URLrequest.  Interesting thing to note was the ETag in the
> > response:
> >
> > GET /f4ce3f4ef065f157d07dd20977598b0e.swf HTTP/1.1
> > Accept: */*
> > Accept-Language: en-US
> > Referer: <redacted>www.futurehopping.com / self-sustaining-greenhouse/
> > x-flash-version: 14,0,0,176
> > User-Agent: Mozilla/5.0 (compatible; MSIE 9.0; Windows NT 6.1; WOW64;
> > Trident/5.0)
> > Host: 2dollarpeepshow.com
> > Cache-Control: max-stale=0
> > Connection: Keep-Alive
> > Pragma: no-cache
> >
> > HTTP/1.1 200 OK
> > Date: Tue, 09 Dec 2014 23:55:31 GMT
> > Server: Apache/2.2.15 (CentOS)
> > Last-Modified: Tue, 02 Dec 2014 15:35:51 GMT
> > ETag: "2f184b-3bc-5093d7b5e83c0"
> > Accept-Ranges: bytes
> > Content-Length: 956
> > Connection: close
> > Content-Type: application/x-shockwave-flash
> >
> > Not sure if this is isolated, or an infection of some sort....the
> > iframe parameter might be able to be sig'd up as well:
> >
> > <redacted>iframe name="37BF769D6F28F3EA27520E9EC44C0644"
> > id="37BF769D6F28F3EA27520E9EC44C0644"
> >
> > style="position:absolute;top:5000px;left:5000px;width:
> > 300px;height:300px;"></iframe<redacted>
> >
> > Anyway sig here:
> > alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS
> > (msg:"MALWARE-OTHER Malicious Shockwave redirect script";
> > content:"|2e|swf"; fast_pattern:only; pcre:"/[0-9a-z]{16}\.swf/";
> > metadata:impact_flag red, policy balanced-ips drop, policy
> > security-ips drop, service http; reference:
> >
> > url,www.virustotal.com/en/file/f4e0c392b0249bd307b818cffa8a5b
> > 8ee5259a44fa0405f445e279da7e1206e6/analysis/1418224977;"
> >
> > classtype:trojan-activity; sid:10000147; rev:1;)
> >
> > All the previous names are 16 characters (thanks VT) so that's what
> > I'm matching on..might help out someone somewhere...thoughts and fixes
> > are welcome..thanks all.
> >
> > James
>
> Ok..this one should be a little better..clearly I'm not good at making
> sigs ;) :
>
> alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"MALWARE-OTHER
> Angler Landing Gate"; content:"|2e|swf"; fast_pattern:only; pcre:"/GET
> |2f|[0-9a-z]{16}\.swf/"; metadata:impact_flag red, policy balanced-ips
> drop, policy security-ips drop, service http; reference: url,
> www.virustotal.com/en/file/f4e0c392b0249bd307b818cffa8a5b
> 8ee5259a44fa0405f445e279da7e1206e6/analysis/1418224977;
> classtype:trojan-activity; sid:10000147; rev:3;)
>
> James
>
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