alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET JA3 Hash - Possible POSHC2 Client CnC"; flowbits:set,ET.poshc2.powershellclient; flowbits:noalert; ja3.hash; content:"c12f54a3f91dc7bafd92cb59fe009a35"; reference:url,labs.nettitude.com/blog/detecting-poshc2-indicators-of-compromise/; classtype:unknown; sid:2030366; rev:1; metadata:attack_target Client_Endpoint, created_at 2020_06_19, deployment Perimeter, malware_family PoshC2, performance_impact Low, confidence Low, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_19;)