alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sharik/Smoke Loader Microsoft Connectivity check"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/kb/"; depth:4; fast_pattern; pcre:"/^\/kb\/\d{4,8}$/"; http.header_names; content:!"Referer|0d 0a|"; content:!"Accept"; reference:md5,193494912a6f549c0da40bf22c3384ee; classtype:trojan-activity; sid:2018677; rev:4; metadata:created_at 2014_07_15, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_08_03;)