alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET WORM Rimecud Worm checkin"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/taskx.txt"; fast_pattern; http.user_agent; content:"Mozilla/3.0 (compatible|3b 20|Indy Library)"; depth:38; reference:md5,9623efa133415d19c941ef92a4f921fc; classtype:trojan-activity; sid:2012739; rev:4; metadata:created_at 2011_04_29, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_10_13;)