alert dns $HOME_NET any -> any any (msg:"ET MALWARE Win32/Bisonal Backdoor CnC Domain in DNS Lookup"; dns.query; content:"ergencucur.com"; nocase; bsize:14; reference:url,twitter.com/nao_sec/status/1438460553479921665; reference:md5,60490ea995531924f77af5f1bfb38eec; classtype:domain-c2; sid:2033963; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_09_16, deployment Perimeter, malware_family Bisonal, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_09_16;)