ET MALWARE Observed PhantomNet C2 Domain (associate .freeonlinelearningtech .com in TLS SNI)
Sourceet/open
CreatedJune 7, 2024
UpdatedApril 21, 2025
Classificationtrojan-activity
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MALWARE Observed PhantomNet C2 Domain (associate .freeonlinelearningtech .com in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".associate.freeonlinelearningtech.com"; endswith; fast_pattern; reference:url,news.sophos.com/en-us/2024/06/05/operation-crimson-palace-sophos-threat-hunting-unveils-multiple-clusters-of-chinese-state-sponsored-activity-targeting-southeast-asia/; classtype:trojan-activity; sid:2053336; rev:2; metadata:attack_target Client_Endpoint, created_at 2024_06_07, deployment Perimeter, deprecation_reason Relevance, confidence High, signature_severity Major, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_04_21, reviewed_at 2025_04_21, mitre_tactic_id TA0011, mitre_tactic_name Command_And_Control, mitre_technique_id T1071, mitre_technique_name Application_Layer_Protocol;)
Metadata
attack targetClient_Endpoint
created at2024_06_07
deploymentPerimeter
deprecation reasonRelevance
confidenceHigh
signature severityMajor
tagDescription_Generated_By_Proofpoint_Nexus
updated at2025_04_21
reviewed at2025_04_21
mitre tactic idTA0011
mitre tactic nameCommand_And_Control
mitre technique idT1071
mitre technique nameApplication_Layer_Protocol
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