alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL/GenKryptik.FQRH Download Request"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/vbc.exe"; endswith; fast_pattern; pcre:"/^\/\d{2,3}\/vbc.exe$/U"; http.host; pcre:"/^\d{1,3}\.\d{1,3}\.\d{1,3}\.\d{1,3}$/"; http.user_agent; content:"Mozilla/4.0 (compatible|3b| MSIE 7.0|3b| Windows NT 6.1|3b|"; startswith; http.header_names; content:!"Referer"; reference:md5,180defaf66190b475e636e0d7bcf0aed; classtype:trojan-activity; sid:2035207; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2022_02_16, deployment Perimeter, malware_family MSIL_GenKryptik_FQRH, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_03_14;)