alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Win32/PivNoxy CnC Activity"; flow:established,to_server; urilen:17; http.cookie; content:"id="; startswith; bsize:15; http.header_names; content:"|0d 0a|Accept|0d 0a|Cookie|0d 0a|User-Agent|0d 0a|Host|0d 0a|Content-Length|0d 0a|Connection|0d 0a|Cache-Control|0d 0a 0d 0a|"; fast_pattern; http.uri; pcre:"/^\/[0-9a-f]{16}$/"; reference:url,www.welivesecurity.com/2021/02/01/operation-nightscout-supply-chain-attack-online-gaming-asia/; reference:md5,77a06a18015ee2d509d8e89000489eb6; reference:md5,7fd7b1c218d7df7a3f09a8f06f141c71; classtype:command-and-control; sid:2031596; rev:3; metadata:attack_target Client_Endpoint, created_at 2021_02_01, deployment Perimeter, malware_family Win32_PivNoxy, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_02_03;)