Versions (4)
Version DetailsCurrent
Rev: 2 • Oct 9, 2024, 12:00 PMET MALWARE Observed CleanUp Loader Domain (microssoft-teams .com in TLS SNI)
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed CleanUp Loader Domain (microssoft-teams .com in TLS SNI)"; flow:established,to_server; tls.sni; bsize:20; content:"microssoft-teams.com"; fast_pattern; reference:url,go.recordedfuture.com/hubfs/reports/cta-2024-1009.pdf; classtype:trojan-activity; sid:2056622; rev:2; metadata:attack_target Client_Endpoint, created_at 2024_10_09, deployment Perimeter, deprecation_reason Relevance, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_05_14, reviewed_at 2025_05_14, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)
Oct 9, 2024, 12:00 PM
May 14, 2025, 12:00 PM
Oct 9, 2024, 9:00 PM
Jul 21, 2025, 9:34 PM
rules/emerging-malware.rules