ET MOBILE_MALWARE NSO Group Spyware Domain in TLS SNI (fr24cast .com)
Sourceet/open
Fileemerging-mobile_malware.rules
CreatedJune 10, 2026
UpdatedJune 10, 2026
Classificationdomain-c2
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET MOBILE_MALWARE NSO Group Spyware Domain in TLS SNI (fr24cast .com)"; flow:established,to_server ; tls.sni; bsize:12; content:"fr24cast.com"; fast_pattern; reference:url,about.fb.com/news/2026/06/fighting-spyware-an-update-from-whatsapp/ ; classtype:domain-c2; sid:2069908; rev:1; metadata:affected_product Windows_XP_Vista_7_8_10_Server_32_64_Bit, attack_target Client_Endpoint, created_at 2026_06_10, deployment Perimeter, performance_impact Low, confidence High, signature_severity Critical, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2026_06_10;)
Metadata
affected productWindows_XP_Vista_7_8_10_Server_32_64_Bit
attack targetClient_Endpoint
created at2026_06_10
deploymentPerimeter
performance impactLow
confidenceHigh
signature severityCritical
tagDescription_Generated_By_Proofpoint_Nexus
updated at2026_06_10
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