alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE PawnStorm Sednit DL Aug 28 2015"; flow:established,to_server; http.uri; content:"/cormac.mcr"; http.header_names; content:!"Referer|0d 0a|"; classtype:targeted-activity; sid:2021729; rev:3; metadata:created_at 2015_08_28, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_01;)