alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/RM3Loader Activity (set)"; flow:established,to_server; flowbits:set,ET.rm3loader; flowbits:noalert; http.method; content:"POST"; http.uri; content:".html"; endswith; http.header_names; content:"|0d 0a|Cache-Control|0d 0a|Connection|0d 0a|Pragma|0d 0a|"; fast_pattern; startswith; content:!"Referer"; http.request_body; content:"|0d 0a|Content-Disposition|3a 20|form-data|3b 20|name=|22|"; reference:md5,aaef17d68339c7f2f19fb780ab90e156; classtype:trojan-activity; sid:2039122; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_10_07, deployment Perimeter, deployment SSLDecrypt, malware_family ursnif, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_10_07;)