alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Linkup Ransomware check-in"; flow:established,to_server; urilen:20; http.method; content:"POST"; http.uri; content:"/uplink.php?logo.jpg"; http.request_body; content:"token="; reference:url,blog.emsisoft.com/2014/02/03/malware-analysis-ransomware-linkup-blocks-dns-and-mines-bitcoins/; classtype:trojan-activity; sid:2018122; rev:3; metadata:attack_target Client_Endpoint, created_at 2014_02_12, deployment Perimeter, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_27, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)