alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE Buer Loader Successful Payload Download"; flow:established,to_client; flowbits:isset,ETPRO.wacatac.b.download; http.stat_code; content:"200"; http.content_type; content:"application/*"; fast_pattern; bsize:13; http.content_len; byte_test:0,>,500000,0,string,dec; byte_test:0,<,3000000,0,string,dec; reference:md5,a8819db1fa758fd9f1d501dbb50f454f; classtype:command-and-control; sid:2029079; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_11_12, deployment Perimeter, malware_family BuerLoader, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_02_11;)