alert tls $EXTERNAL_NET any -> $HOME_NET any (msg:"ET JA3 Hash - Possible Cobalt Strike Server"; flowbits:isset,ET.cobaltstrike.ja3; ja3s.hash; content:"aa29d305dff6e6ac9cd244a62c6ad0c2"; reference:url,thedfirreport.com/2021/07/19/icedid-and-cobalt-strike-vs-antivirus/; classtype:bad-unknown; sid:2033395; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_07_23, deployment Perimeter, malware_family Cobalt_Strike, confidence Low, signature_severity Major, updated_at 2021_07_23, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1001, mitre_technique_name Data_Obfuscation;)