Rule History

alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Possible Kelihos Infection Executable Download With Malformed Header"; flow:established,from_server; http.header; content:"Last-Modified|3a|"; http.header.raw; pcre:"/^Last-Modified\x3a(?:\s[^\r\n]{2}|[^\r\n\s]{3}),/m"; file.data; content:"MZ"; within:2; byte_jump:4,58,relative,little; content:"PE|00 00|"; fast_pattern; distance:-64; within:4; classtype:trojan-activity; sid:2018241; rev:3; metadata:created_at 2014_03_09, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_04_28;)