alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET 443 (msg:"ET MALWARE Win32/Bumblebee Loader Checkin Activity"; flow:established,to_server; flowbits:isset,et.bumblebee; dsize:100<>200; content:"|66 61 6c 63 6f 6e 22|"; startswith; fast_pattern; reference:md5,270103c51888a8e98972283c825d84cd; classtype:trojan-activity; sid:2047946; rev:1; metadata:attack_target Client_Endpoint, created_at 2023_09_07, deployment Perimeter, malware_family Win32_Bumblebee, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_09_07, reviewed_at 2023_09_07; target:src_ip;)