alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MAGICHOUND.LEASH IRC CnC Beacon"; flow:established,to_server; content:"USER AS_a # # |3a|des|0d 0a|"; depth:20; reference:md5,3c8a142d2e3b84fb0d210250af77cc9b; reference:url,researchcenter.paloaltonetworks.com/2017/02/unit42-magic-hound-campaign-attacks-saudi-targets/; classtype:command-and-control; sid:2023963; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2017_02_16, deployment Perimeter, malware_family MAGICHOUND_LEASH, confidence High, 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;)