ET ADWARE_PUP Observed Abused Tools Domain in TLS SNI - Commonly Used for SMTP Exfil (4t-niagara .com)
Sourceet/open
CreatedOctober 22, 2025
UpdatedOctober 22, 2025
Classificationmisc-activity
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET ADWARE_PUP Observed Abused Tools Domain in TLS SNI - Commonly Used for SMTP Exfil (4t-niagara .com)"; flow:established,to_server; tls.sni; dotprefix; content:".4t-niagara.com"; endswith; fast_pattern; reference:md5,59f38f999d773fa5cd166fc9f655bc0d; classtype:misc-activity; sid:2065285; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_10_22, deployment Perimeter, malware_family PUP, confidence High, signature_severity Minor, tag SSL_Malicious_Cert, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_10_22;)
References
| md5 | 59f38f999d773fa5cd166fc9f655bc0d |
Metadata
attack targetClient_Endpoint
created at2025_10_22
deploymentPerimeter
malware familyPUP
confidenceHigh
signature severityMinor
tagDescription_Generated_By_Proofpoint_Nexus
updated at2025_10_22
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