alert dns $HOME_NET any -> any any (msg:"ET MALWARE APT28 DealersChoice DNS Lookup"; dns.query; content:"securityprotectingcorp.com"; depth:26; nocase; endswith; fast_pattern; reference:url,researchcenter.paloaltonetworks.com/2016/12/unit42-let-ride-sofacy-groups-dealerschoice-attacks-continue/; classtype:targeted-activity; sid:2023658; rev:5; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_11_03, deployment Perimeter, malware_family APT28, confidence Medium, signature_severity Major, updated_at 2023_03_24;)