alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan-Downloader.Win32.Small Checkin"; flow:established,to_server; http.method; content:"GET"; nocase; http.uri; content:"|2e|ashx|3f|m|3d|"; fast_pattern; content:"|2d|"; distance:2; within:1; content:"|26|mid|3d|"; distance:0; content:"|26|tid|3d|"; distance:0; content:"|26|d|3d|"; distance:0; content:"|26|uid|3d|"; distance:0; content:"|26|t|3d|"; distance:0; reference:md5,48432bdd116dccb684c8cef84579b963; classtype:command-and-control; sid:2012839; rev:5; metadata:created_at 2011_05_23, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_16;)