alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Unk.PSAttack Activity"; flow:established,to_server; http.method; content:"GET"; http.uri; content:"/powershell_attack.txt"; endswith; fast_pattern; http.header_names; content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; bsize:22; reference:md5,f9eb044f8b537aa5d9164b1784d618a2; classtype:trojan-activity; sid:2032793; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_04_21, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_01_25, reviewed_at 2024_03_06;)