alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/Eris Ransomware CnC Checkin"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/api/v1/check"; depth:13; fast_pattern; endswith; http.request_body; content:"|7b 22 75 69 64 22 3a 22|"; depth:8; content:"|22 7d|"; endswith; pcre:"/^\{\x22uid\x22\x3a\x22[a-f0-9]+\x22\}$/si"; http.accept_enc; content:"gzip"; depth:4; endswith; http.header_names; content:!"Referer"; reference:md5,a4eeec442799c56c3e1aa9761661fb42; reference:url,www.bleepingcomputer.com/news/security/rig-exploit-kit-pushing-eris-ransomware-in-drive-by-downloads/; classtype:command-and-control; sid:2027802; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_08_05, deployment Perimeter, deprecation_reason Age, malware_family Eris, confidence Medium, signature_severity Major, tag Ransomware, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_12_20, reviewed_at 2023_12_20, mitre_tactic_id TA0040, mitre_tactic_name Impact, mitre_technique_id T1486, mitre_technique_name Data_Encrypted_for_Impact;)