Rule History

alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed PeakLight/Emmenhtal Loader Domain (download .instructionclubs .com in TLS SNI)"; flow:established,to_server; tls.sni; bsize:29; content:"download.instructionclubs.com"; fast_pattern; reference:url,orangecyberdefense.com/global/blog/cert-news/emmenhtal-a-little-known-loader-distributing-commodity-infostealers-worldwide; reference:url,cloud.google.com/blog/topics/threat-intelligence/peaklight-decoding-stealthy-memory-only-malware; classtype:trojan-activity; sid:2055960; rev:2; metadata:attack_target Client_Endpoint, created_at 2024_09_18, deployment Perimeter, deprecation_reason Age, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_04_15, reviewed_at 2025_04_15, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)