alert tcp-pkt $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Kakfum/COLDSTEEL CnC Beacon M3"; flow:established,to_server; dsize:16; content:"|00 00 00 11 98 01 00 00 00 1e 22 00|"; depth:12; reference:md5,14c04f88dc97aef3e9b516ef208a2bf5; classtype:command-and-control; sid:2044065; rev:1; metadata:created_at 2023_02_02, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2023_02_02;)