Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE GET Request to steamcommunity .com With Minimal Headers - Common With InfoStealers"; flow:established,to_server; http.method; content:"GET"; http.header_names; bsize:<20; content:!"|0d 0a|referer|0d 0a|"; nocase; content:!"|0d 0a|accept|0d 0a|"; nocase; content:!"|0d 0a|user-agent|0d 0a|"; nocase; http.host; content:"steamcommunity.com"; endswith; fast_pattern; threshold:type limit,count 1,seconds 300,track by_src; classtype:trojan-activity; sid:2064211; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_08_28, deployment Perimeter, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_09_02, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application; target:src_ip;)