alert dns $HOME_NET any -> any any (msg:"ET MALWARE Domino Loader CnC Domain (upperdunk .com) in DNS Lookup"; dns.query; content:"upperdunk.com"; nocase; bsize:13; reference:url,otx.alienvault.com/pulse/643ee60678f5ae475adf3081; reference:url,hsecurityintelligence.com/posts/ex-conti-fin7-actors-collaborate-new-domino-backdoor/; classtype:domain-c2; sid:2045061; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2023_04_19, deployment Perimeter, malware_family Domino_Loader, performance_impact Low, confidence High, signature_severity Major, tag Domino_Loader, updated_at 2023_04_19, reviewed_at 2025_07_14;)