alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Tortoiseshell/HMH Download Request"; flow:established,to_server; http.method; content:"GET"; http.uri; content:".asmx/GetUpdate?val="; fast_pattern; http.header_names; content:"|0d 0a|Host|0d 0a|Connection|0d 0a 0d 0a|"; depth:22; endswith; reference:md5,a194e3bf830104922295c37e6d19d9a2; reference:url,blog.talosintelligence.com/2019/09/tortoiseshell-fake-veterans.html; classtype:command-and-control; sid:2028617; rev:3; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2019_09_24, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, updated_at 2020_09_17, reviewed_at 2024_02_20;)