Rule History

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE VenusLocker Activity"; flow:established,to_server; http.uri; content:"/dumbdumb?"; startswith; fast_pattern; pcre:"/\=(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=|[A-Za-z0-9+/]{4})$/R"; http.accept; content:"text/*"; bsize:6; http.header_names; content:!"Referer"; content:!"Connect"; reference:md5,9aa3cc9d7c641ea22cfa3e5233e13c94; classtype:trojan-activity; sid:2032968; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_05_17, deployment Perimeter, malware_family VenusLocker, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_05_17;)