alert dns $HOME_NET any -> any any (msg:"ET MALWARE SHARPEXT CnC Domain in DNS Lookup (siekis .com)"; dns.query; dotprefix; content:".siekis.com"; nocase; endswith; reference:url,www.volexity.com/blog/2022/07/28/sharptongue-deploys-clever-mail-stealing-browser-extension-sharpext/; classtype:domain-c2; sid:2037956; rev:1; metadata:affected_product Web_Browser_Plugins, attack_target Client_Endpoint, created_at 2022_08_08, deployment Perimeter, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_08_08;)