alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Win32/XFILES Stealer Data Exfiltration Attempt"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/?Chatid|3d 40|"; fast_pattern; http.content_type; content:"multipart/form-data|3b 20|boundary|3d 22|"; pcre:"/^[a-f0-9]{8}-(?:[a-f0-9]{4}-){3}[a-f0-9]{12}\x22/R"; http.header_names; content:!"Referrer"; reference:md5,90632a93c8886957f9eeee66489b269e; classtype:trojan-activity; sid:2041780; rev:2; metadata:attack_target Client_and_Server, created_at 2022_12_05, deployment Perimeter, former_category MALWARE, malware_family Win32_XFILES, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_09_23, reviewed_at 2024_09_23;)