Rule History

alert dns $HTTP_SERVERS any -> $EXTERNAL_NET any (msg:"ET WEB_SERVER Webserver Resolving Known Webshell CnC Domain (anonymousfox)"; dns.query; content:"anonymousfox."; startswith; fast_pattern; pcre:"/(?:is|mx|info|co)$/"; reference:url,twitter.com/unmaskparasites/status/1507038308789936150; classtype:bad-unknown; sid:2035612; rev:3; metadata:attack_target Web_Server, created_at 2022_03_25, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_05_18;)