alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Sage Ransomware Checkin Primer"; flow:established,to_server; urilen:1; flowbits:set,ET.Sage.Primer; flowbits:noalert; http.start; content:"POST / HTTP/1.1|0d 0a|Host|3a|"; fast_pattern; http.header_names; content:!"User-Agent|0d 0a|"; content:!"Accept"; content:!"Referer|0d 0a|"; content:!"Cookie|0d 0a|"; content:!"Content-Type|0d 0a|"; http.request_body; pcre:"/^.{0,15}[\x00-\x09\x80-\xff]/s"; reference:url,isc.sans.edu/forums/diary/Sage+20+Ransomware/21959; classtype:command-and-control; sid:2023766; rev:7; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_01_25, deployment Perimeter, malware_family Ransomware, malware_family Sage, performance_impact Moderate, confidence High, signature_severity Major, tag Ransomware, updated_at 2024_05_29, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)