Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed Librarian Ghoul Domain (office-email .ru in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".office-email.ru"; endswith; fast_pattern; reference:url,securelist.com/librarian-ghouls-apt-wakes-up-computers-to-steal-data-and-mine-crypto/116536/; classtype:trojan-activity; sid:2065324; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_10_22, deployment Perimeter, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_22;)