alert dns $HOME_NET any -> any any (msg:"ET MALWARE Scarlet Mimic DNS Lookup 33"; dns.query; content:"opero.spdns.org"; depth:15; nocase; endswith; fast_pattern; reference:url,researchcenter.paloaltonetworks.com/2016/01/scarlet-mimic-years-long-espionage-targets-minority-activists/; classtype:trojan-activity; sid:2022443; rev:5; metadata:created_at 2016_01_27, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_09_17;)