Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET RETIRED Win32/Fewin Stealer Data Exfiltration Attempt"; flow:established,to_server; http.method; content:"POST"; http.uri; content:"/Up/b"; bsize:5; http.content_type; content:"application/octet-stream|3b 20|boundary|3d 2d 2d 2d 2d|"; http.request_body; content:"PK"; startswith; content:"1/0/cert"; fast_pattern; within:100; reference:md5,56b7f9a65fbab95e2c854b96c68ffee2; reference:md5,abceb35cf20f22fd8a6569a876e702cb; classtype:trojan-activity; sid:2049140; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, created_at 2023_11_09, deployment Perimeter, former_category MALWARE, malware_family Stealer, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_04_17, reviewed_at 2025_04_17, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system; target:src_ip;)