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Re: [Emerging-Sigs] Browser Extension Hijack sigs
From: Will Metcalf <wmetcalf () emergingthreatspro com>
Date: Mon, 13 May 2013 12:38:45 -0500

Nice! Have you seen be anything other than googleusercontent.com or
mozilla.org? Also it seems that both of these ship add-ons over ssl at
least in my limited testing, have you seen something to the contrary?

Regards,

Will


On Mon, May 13, 2013 at 12:02 PM, James Lay <jlay () slave-tothe-box net>wrote:

http://blogs.technet.com/b/**mmpc/archive/2013/05/10/**
browser-extension-hijacks-**facebook-profiles.aspx<http://blogs.technet.com/b/mmpc/archive/2013/05/10/browser-extension-hijacks-facebook-profiles.aspx>

I created the firefox plugin sigs a while ago (fixed):

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"POLICY Firefox
Plugin install"; flow:to_server,established; content:"mozilla";
http_header; content:".xpi"; http_uri; reference:url,http://research.**
zscaler.com/2012/09/how-to-**install-silently-malicious.**html<http://research.zscaler.com/2012/09/how-to-install-silently-malicious.html>;
classtype:bad-unknown; sid:10000029; rev:2)

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"POLICY Possible
Firefox Plugin install from non-trusted source";
flow:to_server,established; content:!"mozilla"; http_header;
content:".xpi"; http_uri; reference:url,http://research.**
zscaler.com/2012/09/how-to-**install-silently-malicious.**html<http://research.zscaler.com/2012/09/how-to-install-silently-malicious.html>;
classtype:bad-unknown; sid:10000030; rev:2)

These should match with Chrome:

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"POLICY Chrome
Plugin install"; flow:to_server,established; content:"googleusercontent";
http_header; content:"|2f|crx|2f|blobs"; http_uri; reference:url,
http://blogs.**technet.com/b/mmpc/archive/**2013/05/10/browser-extension-*
*hijacks-facebook-profiles.aspx<http://blogs.technet.com/b/mmpc/archive/2013/05/10/browser-extension-hijacks-facebook-profiles.aspx>
**; classtype:bad-unknown; sid:10000054; rev:1)

alert tcp $HOME_NET any -> $EXTERNAL_NET $HTTP_PORTS (msg:"POLICY Possible
Chrome Plugin install from non-trusted source"; flow:to_server,established;
content:!"googleusercontent"; http_header; content:"|2f|crx|2f|blobs";
http_uri; reference:url,http://blogs.**technet.com/b/mmpc/archive/**
2013/05/10/browser-extension-**hijacks-facebook-profiles.aspx<http://blogs.technet.com/b/mmpc/archive/2013/05/10/browser-extension-hijacks-facebook-profiles.aspx>
**; classtype:bad-unknown; sid:10000055; rev:1)

Enjoy

James
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