alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE StealC v2 CnC Activity (POST)"; flow:established,to_server; flowbits:set,ET.StealC.v2; urilen:21; http.method; content:"POST"; http.uri; pcre:"/^\x2f[a-z0-9]{16}\x2ephp$/"; http.content_type; content:"application/json"; http.header; content:"Cache|2d|Control|3a| no|2d|cache|0d 0a|"; http.header_names; bsize:55; content:"|0d 0a|Content-Type|0d 0a|Host|0d 0a|Content-Length|0d 0a|Cache-Control|0d 0a 0d 0a|"; fast_pattern; http.request_body; base64_decode:bytes 24, offset 0; base64_data; content:"|7b 22|access|5f|token|22 3a 20 22|"; reference:md5,f4398f139f80cb47207ef34dc5b7df0c; reference:url,x.com/g0njxa/status/1910364088963649750; reference:url,app.any.run/tasks/78b9c7f0-2412-4b48-b02c-64c81539d67b; classtype:command-and-control; sid:2061450; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_04_11, deployment Perimeter, malware_family Stealc, confidence High, signature_severity Critical, tag c2, updated_at 2025_04_11, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)