Re: [Emerging-Sigs] Malicious swf sig

[James Lay <jlay () slave-tothe-box net>]

On 2014-12-10 01:58 PM, Will Metcalf wrote: 

> 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 [15]> 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 [1])
> > >
GET kj-invest.com/2de96bd378d6e6614297e27284fdb335.swf [2]
> > > POST

> > >
newfamilynutrition.com/c9e9975e0f51af3ce1354090fb303d8e.php?q=87086c5336208ce7836edca90ecc8d25
[3]
> > > # this POST request is made by the SWF
> > > GET
qwe.leucaenaleucocephalaporno.net/7xibe37z48 [4] # actual Angler EK
> > >
GET
> > >
qwe.leucaenaleucocephalaporno.net/4PJOZWsxU4AMjReTBUSHArovOS32pWLvpt0cwm0sEion8J7ahaP62dkHtp-auIWi
[5]
> > > The SWF receives parameters dynamically through HTML param
attributes
> > > to determine where to redirect.
> > >
> > > -----Original
Message-----
> > > From: emerging-sigs-bounces () lists emergingthreats net
[6]
> > > [mailto:emerging-sigs-bounces () lists emergingthreats net [7]] 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: www.futurehopping.com [8] /
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 [9]
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:
> > > iframe
name="37BF769D6F28F3EA27520E9EC44C0644"
> > >
id="37BF769D6F28F3EA27520E9EC44C0644"
> > >
style="position:absolute;top:5000px;left:5000px;width:300px;height:300px;">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/f4e0c392b0249bd307b818cffa8a5b8ee5259a44fa0405f445e279da7e1206e6/analysis/1418224977
[10];"
> > > 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/f4e0c392b0249bd307b818cffa8a5b8ee5259a44fa0405f445e279da7e1206e6/analysis/1418224977
[11]; classtype:trojan-activity; sid:10000147; rev:3;)
> > James 

> > _______________________________________________
> > Emerging-sigs
mailing list
> > Emerging-sigs () lists emergingthreats net [12]
https://lists.emergingthreats.net/mailman/listinfo/emerging-sigs [13]
> >

> > Support Emerging Threats! Subscribe to Emerging Threats Pro
http://www.emergingthreats.net [14]

Interesting....the one I saw had no
leading directory...and 16 characters instead of 32. 

James


Links:
------
[1]
http://malware-traffic-analysis.net/2014/10/30/index.html
[2]
http://kj-invest.com/2de96bd378d6e6614297e27284fdb335.swf
[3]
http://newfamilynutrition.com/c9e9975e0f51af3ce1354090fb303d8e.php?q=87086c5336208ce7836edca90ecc8d25
[4]
http://qwe.leucaenaleucocephalaporno.net/7xibe37z48
[5]
http://qwe.leucaenaleucocephalaporno.net/4PJOZWsxU4AMjReTBUSHArovOS32pWLvpt0cwm0sEion8J7ahaP62dkHtp-auIWi
[6]
mailto:emerging-sigs-bounces () lists emergingthreats net
[7]
mailto:emerging-sigs-bounces () lists emergingthreats net
[8]
http://www.futurehopping.com
[9] http://2dollarpeepshow.com
[10]
http://www.virustotal.com/en/file/f4e0c392b0249bd307b818cffa8a5b8ee5259a44fa0405f445e279da7e1206e6/analysis/1418224977
[11]
http://www.virustotal.com/en/file/f4e0c392b0249bd307b818cffa8a5b8ee5259a44fa0405f445e279da7e1206e6/analysis/1418224977
[12]
mailto:Emerging-sigs () lists emergingthreats net
[13]
https://lists.emergingthreats.net/mailman/listinfo/emerging-sigs
[14]
http://www.emergingthreats.net
[15] mailto:jlay () slave-tothe-box net

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