alert dns $HOME_NET any -> any any (msg:"ET MALWARE Observed DNS Query to Skitnet/Bossnet Domain (100000000000000...)"; dns.query; bsize:>15; content:"100000000000000"; startswith; nocase; pcre:"/^[a-f0-9]{2}+\x2ecom/R"; reference:url,community.emergingthreats.net/t/sigs-et-malware-skitnet-bossnet-backdoor-dns-txt/2749; reference:url,catalyst.prodaft.com/public/report/skitnet/overview; classtype:domain-c2; sid:2062547; rev:1; metadata:attack_target Client_Endpoint, tls_state TLSDecrypt, created_at 2025_05_22, deployment Perimeter, deployment SSLDecrypt, performance_impact Low, confidence High, signature_severity Major, updated_at 2025_05_22, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol; target:src_ip;)