alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Andariel Backdoor Activity (Checkin)"; flow:established,to_server; content:"HTTP|20|1.1|20|/index.php?member="; startswith; fast_pattern; content:"|20|SSL3.3"; distance:0; reference:url,twitter.com/360CoreSec/status/1405790277034418177; reference:md5,c827d95429b644e918d53b24719dbe6e; classtype:command-and-control; sid:2033207; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_06_30, deployment Perimeter, malware_family Lazarus, malware_family Andariel, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_06_30;)