alert tcp $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE MSIL/Black Hat Worm Server Response"; flow:established,to_client; stream_size:client,<,5; content:"|2d 62 6c 61 63 6b 20 68 61 74|"; reference:md5,bfa67c998ebedf8ab17e2d8898d0067d; reference:md5,42c130f8d037d6cc0ca4342b6e8794b4; classtype:command-and-control; sid:2033932; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_13, deployment Perimeter, deprecation_reason False_Positive, malware_family MSIL_Black, performance_impact Low, confidence Medium, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_01_31;)