alert tcp $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Possible NK APT SLICKSHOES Host Checkin"; flow:established,to_server; content:"|41 00 70 00 6f 00 6c 00 6c 00 6f 00 5a 00 65 00 75 00 73 00|"; depth:20; fast_pattern; reference:md5,b57db76cc1c0175c4f18ea059d9e2ab2; reference:url,www.us-cert.gov/ncas/analysis-reports/ar20-045b; classtype:targeted-activity; sid:2029478; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_02_18, deployment Perimeter, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_02_18;)