alert http $EXTERNAL_NET any -> $HOME_NET any (msg:"ET MALWARE SpyAgent C&C Activity (Response)"; flow:established,to_client; http.stat_code; content:"200"; file.data; content:"|21|lexec|3b|http"; startswith; fast_pattern; content:"|2e|exe"; endswith; reference:md5,fbfd9afac42ae8e86193a8e4be085eaf; reference:url,trendmicro.com/en_us/research/21/k/campaign-abusing-rats-uses-fake-websites.html; classtype:command-and-control; sid:2034574; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_12_01, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_05_03;)