alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL/n2019cov (COVID-19) Ransomware CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:".php"; endswith; http.request_body; content:"usuario="; startswith; content:"|20|-|20|"; distance:0; content:"|20|-|20|"; distance:0; content:"&llave1="; distance:0; content:"&llave2="; distance:0; fast_pattern; http.header_names; content:!"Referer"; content:!"User-Agent"; reference:md5,f02e5ae5b997e447a43ace281bc2bae9; classtype:command-and-control; sid:2029736; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_03_25, deployment Perimeter, deployment SSLDecrypt, malware_family MSIL_n2019cov, confidence High, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_11_10, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)