alert dns $HOME_NET any -> any any (msg:"ET MALWARE APT28 DealersChoice.B DNS Lookup (appexsrv .net)"; dns.query; content:"appexsrv.net"; depth:12; nocase; endswith; fast_pattern; reference:url,researchcenter.paloaltonetworks.com/2016/10/unit42-dealerschoice-sofacys-flash-player-exploit-platform/; reference:url,researchcenter.paloaltonetworks.com/2016/12/unit42-let-ride-sofacy-groups-dealerschoice-attacks-continue/; classtype:targeted-activity; sid:2023344; rev:6; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2016_10_18, deployment Perimeter, malware_family APT28, malware_family DealersChoice_B, performance_impact Low, confidence Medium, signature_severity Major, updated_at 2020_09_17;)