alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Onkods.A Downloader Checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".exe"; fast_pattern; endswith; pcre:"/^\/(?:[a-z]+\/)*?[a-z]+\.exe$/"; http.user_agent; pcre:"/^(?=\d*[a-z])[a-z0-9]+$/"; http.header_names; content:!"|0d 0a|Accept"; content:!"|0d 0a|Referer|0d 0a|"; content:"|0d 0a|User-Agent|0d 0a|Host|0d 0a 0d 0a|"; startswith; reference:md5,fb570e6d68e708daeceae5dfc544fba2; classtype:command-and-control; sid:2018121; rev:8; metadata:created_at 2014_02_12, performance_impact Significant, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_04_08, reviewed_at 2024_03_11;)