alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE HTTPCore CnC Tasking File"; flow:established,to_client; http.stat_code; content:"200"; file_data; content:"|89 50 4e 57 0d 0a 1a 0a 3c 3c 3c 3c|"; startswith; fast_pattern; reference:url,www.cyber.gov.au/sites/default/files/2020-06/ACSC-Advisory-2020-008-Copy-Paste-Compromises.pdf; classtype:command-and-control; sid:2030365; rev:2; metadata:attack_target Client_Endpoint, created_at 2020_06_19, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2020_06_19;)