alert dns $HOME_NET any -> any any (msg:"ET MALWARE Spark Backdoor CnC Domain Query"; dns.query; content:"nysura.com"; nocase; bsize:10; reference:url,www.cybereason.com/blog/new-cyber-espionage-campaigns-targeting-palestinians-part-one; classtype:domain-c2; sid:2029492; rev:2; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2020_02_19, deployment Perimeter, confidence High, signature_severity Major, updated_at 2020_10_30;)