Versions (3)
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Rev: 1 • Feb 2, 2026, 12:00 PMET MALWARE Chrysalis Backdoor CnC Domain in TLS SNI (skycloudcenter .com)
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Chrysalis Backdoor CnC Domain in TLS SNI (skycloudcenter .com)"; flow:established,to_server; tls.sni; dotprefix; content:".skycloudcenter.com"; endswith; fast_pattern; reference:url,www.rapid7.com/blog/post/tr-chrysalis-backdoor-dive-into-lotus-blossoms-toolkit/; classtype:domain-c2; sid:2067264; rev:1; metadata:affected_product Notepad__, created_at 2026_02_02, performance_impact Low, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_02_02;)
Feb 2, 2026, 12:00 PM
Feb 2, 2026, 12:00 PM
Feb 2, 2026, 9:34 PM
Feb 4, 2026, 10:34 PM
rules/emerging-malware.rules