alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE MSIL/Small.FU Variant CnC Activity M1"; flow:established,to_server; http.request_line; content:"GET /delonl.php?hwid="; startswith; content:!"&"; distance:0; http.header_names; content:!"|0d 0a|Referer|0d 0a|"; content:!"|0d 0a|Accept|0d 0a|"; content:!"|0d 0a|User-Agent|0d 0a|"; reference:md5,72513b6c906dcac441a146c8ebf256e7; classtype:command-and-control; sid:2033924; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2021_09_10, deployment Perimeter, malware_family MSIL_Small_FU, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_10;)