alert dns $HOME_NET any -> any any (msg:"ET MALWARE TA455 Related CnC Domain in DNS Lookup"; dns.query; content:"sparrowsgroup.org"; nocase; bsize:17; classtype:domain-c2; sid:2035799; rev:1; metadata:attack_target Client_Endpoint, created_at 2021_08_13, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2021_08_13;)