alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET WEB_CLIENT PDF Name Representation Obfuscation of /Subtype"; flow:established,to_client; file_data; content:"PDF-"; content:"/"; distance:0; content:!"Subtype"; within:7; content:"#"; within:19; pcre:"/\x2F(?!Subtype)(S|#53)(u|#75)(b|#62)(t|#74)(y|#79)(p|#70)(e|#65)/"; reference:url,blog.didierstevens.com/2008/04/29/pdf-let-me-count-the-ways/; classtype:bad-unknown; sid:2011528; rev:6;)

Added 2012-04-16 18:46:09 UTC


alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET WEB_CLIENT PDF Name Representation Obfuscation of /Subtype"; flow:established,to_client; content:"PDF-"; depth:300; content:"/"; distance:0; content:!"Subtype"; within:7; content:"#"; within:19; pcre:"/\x2F[^Subtype](S|#53)(u|#75)(b|#62)(t|#74)(y|#79)(p|#70)(e|#65)/i"; reference:url,blog.didierstevens.com/2008/04/29/pdf-let-me-count-the-ways/; classtype:bad-unknown; sid:2011528; rev:3;)

Added 2011-10-12 19:32:11 UTC


alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET WEB_CLIENT PDF Name Representation Obfuscation of /Subtype"; flow:established,to_client; content:"PDF-"; depth:300; content:"/"; distance:0; content:!"Subtype"; within:7; content:"#"; within:19; pcre:"/\x2F[^Subtype](S|#53)(u|#75)(b|#62)(t|#74)(y|#79)(p|#70)(e|#65)/i"; classtype:bad-unknown; reference:url,blog.didierstevens.com/2008/04/29/pdf-let-me-count-the-ways/; sid:2011528; rev:3;)

Added 2011-02-04 17:31:21 UTC


alert tcp $EXTERNAL_NET $HTTP_PORTS -> $HOME_NET any (msg:"ET WEB_CLIENT PDF Name Representation Obfuscation of Subtype"; flow:established,to_client; content:"PDF-"; depth:300; content:"/"; distance:0; content:!"Subtype"; within:7; content:"#"; within:19; pcre:"/\x2F(S|#53)(u|#75)(b|#62)(t|#74)(y|#79)(p|#70)(e|#65)/i"; classtype:bad-unknown; reference:url,blog.didierstevens.com/2008/04/29/pdf-let-me-count-the-ways/; reference:url,doc.emergingthreats.net/2011528; reference:url,www.emergingthreats.net/cgi-bin/cvsweb.cgi/sigs/WEB_CLIENT/WEB_Adobe; sid:2011528; rev:2;)

Added 2010-09-22 11:26:16 UTC

FP: triggers on "/Subtype" not obfuscated

-- ShaneCastle - 23 Sep 2010


Topic revision: r2 - 2010-09-23 - ShaneCastle
 
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