Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SantaStealer Data Exfiltration Attempt"; flow:established,to_server; http.method; content:"POST"; http.uri; bsize:7; content:"/upload"; http.user_agent; bsize:6; content:"upload"; http.header; content:"auth|3a 20|"; pcre:"/^[a-f0-9]{64}/R"; content:"complete|3a 20|true"; fast_pattern; http.header_names; content:"|0d 0a|auth|0d 0a|"; content:"|0d 0a|w|0d 0a|"; content:"|0d 0a|complete|0d 0a|"; content:!"|0d 0a|referer|0d 0a|"; http.request_body; content:"Content-Disposition|3a 20|form-data|3b 20|name|3d 22|file|22 3b 20|filename|3d 22|"; pcre:"/^[A-F0-9]{8}\x2d(?:[A-F0-9]{4}\x2d){3}[A-F0-9]{6}\x2ezip\x2e/R"; reference:url,www.rapid7.com/blog/post/tr-santastealer-is-coming-to-town-a-new-ambitious-infostealer-advertised-on-underground-forums/; classtype:trojan-activity; sid:2066336; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state plaintext, created_at 2025_12_16, deployment Perimeter, malware_family Stealer, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_12_16, mitre_tactic_id TA0009, mitre_tactic_name Collection, mitre_technique_id T1005, mitre_technique_name Data_from_local_system; target:src_ip;)