alert tcp $HOME_NET any -> $EXTERNAL_NET 443 (msg:"ET MALWARE TA416 Related PUBLOAD Variant Checkin Activity M2"; flow:established,to_server; dsize:12; content:"|17 03 03 00 07 21|"; startswith; fast_pattern; threshold:type limit, track by_src, seconds 120, count 1; reference:md5,264152e46df9c02652e12d68d915485d; reference:url,csirt-cti.net/2024/02/01/stately-taurus-continued-new-information-on-cyberespionage-attacks-against-myanmar-military-junta/; classtype:trojan-activity; sid:2051638; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, affected_product Windows_11, attack_target Client_Endpoint, tls_state TLSEncrypt, created_at 2024_03_13, deployment Perimeter, confidence Medium, signature_severity Major, tag TA416, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2024_03_13; target:src_ip;)