alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Trojan:Win32/Sabsik.FL.B!ml CnC Activity"; flow:established,to_server; stream_size:server,<,5; content:"|0c 22 38 4e 5a 7b 2d 43 00 00 00 00 00 00 00 00|"; startswith; fast_pattern; content:"//"; distance:0; reference:md5,956e62df6ea59dfc9a459ea85d7bb2eb; classtype:command-and-control; sid:2034229; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_10_19, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_10_19;)