Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET HUNTING HTTP GET Request for msvcp40.dll - Possible Infostealer Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"msvcp40.dll"; fast_pattern; xbits:set,ET.infostealer.pattern.1,track ip_src,expire 15; xbits:set,ET.infostealer.pattern.2,track ip_pair,expire 15; flowint: ET.infostealer.dll.download, +, 1; classtype:suspicious-filename-detect; sid:2044304; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_02_22, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence Low, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_22;)