alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Filch Stealer CnC Checkin"; flow:established, to_server; content:"|7c|Intel|28|R|29|"; fast_pattern; pcre:"/\x7c.{6,}\x7c/"; content:"|20|GB|7c|"; content:"|7c|Windows|20|"; pcre:"/^1[01]/R"; reference:url,www.rapid7.com/blog/post/filch-stealer-a-new-infostealer-leveraging-old-techniques/; reference:md5,5e13fd50160acfc9c40de6c3b0f43c11; classtype:trojan-activity; sid:2064802; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, created_at 2025_09_19, deployment Perimeter, malware_family Stealer, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_19, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system; target:src_ip;)