alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Ursnif Payload Request (grab32.rar)"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/grab32.rar"; endswith; fast_pattern; http.header_names; content:!"Referer"; reference:url,github.com/stamparm/maltrail/blob/master/trails/static/malware/ursnif.txt; reference:md5,c453d38c87a5df2fff509a4d9aba40e8; classtype:trojan-activity; sid:2031745; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_03_02, deployment Perimeter, malware_family ursnif, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_03_02;)