alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE DustySky QuasarRAT CnC Beacon"; flow:established,from_server; content:"|10 00 00 00 99 9a c7 b8|"; depth:8; reference:md5,a19d4ff89a3f699a6f8237a7905e80e1; reference:url,researchcenter.paloaltonetworks.com/2017/01/unit42-downeks-and-quasar-rat-used-in-recent-targeted-attacks-against-governments/; classtype:command-and-control; sid:2023813; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_01_31, deployment Perimeter, malware_family DustSky_related_Implant, confidence Medium, signature_severity Major, tag c2, updated_at 2019_07_26, mitre_tactic_id TA0010, mitre_tactic_name Exfiltration, mitre_technique_id T1041, mitre_technique_name Exfiltration_Over_C2_Channel;)