alert http $HTTP_SERVERS any -> $EXTERNAL_NET any (msg:"GPL ATTACK_RESPONSE id check returned nobody"; flow:from_server,established; content:"uid="; content:"|28|nobody|29|"; classtype:bad-unknown; sid:2101883; rev:7; metadata:created_at 2010_09_23, confidence Medium, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2019_07_26;)