alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE W32/StealRat.SpamBot CnC Server Configuration File Response"; flowbits:isset,et.stealrat.config; flow:established,to_client; file_data; content:"<repo"; distance:0; content:"<dudp>"; within:50; content:"<|2F|dudp>"; within:100; content:"<pudp>"; within:50; content:"<|2F|pudp>"; within:100; content:"<tbd>"; within:50; content:"<dom>"; within:50; content:"<|2F|dom>"; within:100; reference:url,www.trendmicro.com/cloud-content/us/pdfs/security-intelligence/white-papers/wp-stealrat.pdf; classtype:command-and-control; sid:2017275; rev:2; metadata:created_at 2013_08_05, signature_severity Major, updated_at 2019_07_26;)