alert dns $HOME_NET any -> any any (msg:"ET MALWARE Sofacy DNS Lookup symanttec.org"; dns.query; content:"symanttec.org"; depth:13; fast_pattern; nocase; endswith; reference:url,fireeye.com/resources/pdfs/apt28.pdf; classtype:targeted-activity; sid:2019576; rev:6; metadata:created_at 2014_10_29, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_17;)