alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Likely PadCrypt Locker PKG DL"; flow:established,to_server; http.uri; content:".pdcr"; nocase; endswith; http.header_names; content:!"Referer|0d 0a|"; reference:md5,b6d25a5629221041e857266b9188ea3b; classtype:trojan-activity; sid:2022568; rev:3; metadata:created_at 2016_02_26, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_24;)