alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Win32/Delf.BLL Variant CnC Activity (Inbound)"; flow:established,to_client; content:"|23 23 24 23 23 0d 0a|"; within:20; dsize:<190; reference:md5,f50a94513fd739f5f40a57879e2f3cff; classtype:trojan-activity; sid:2030559; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_07_20, deployment Perimeter, malware_family Win32_Delf_BLL, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_07_20;)