alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE SystemBC CnC Beacon"; flow:established,to_server; dsize:<1500; content:"randomdata|00 00 00 00 00 00 00 00|"; startswith; fast_pattern; reference:md5,ed44877077716103973cbbebd531f38e; reference:url,thedfirreport.com/2024/08/26/blacksuit-ransomware/; classtype:trojan-activity; sid:2055497; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, tls_state plaintext, created_at 2024_08_26, deployment Perimeter, malware_family SystemBC, confidence High, signature_severity Critical, updated_at 2024_08_26;)