ET INFO Observed Abused File Sharing Domain (nullarmorupload .xyz in TLS SNI)
Sourceet/open
CreatedAugust 20, 2025
UpdatedAugust 20, 2025
Classificationmisc-activity
alert tls $HOME_NET any -> $EXTERNAL_NET any (msg:"ET INFO Observed Abused File Sharing Domain (nullarmorupload .xyz in TLS SNI)"; flow:established,to_server; tls.sni; dotprefix; content:".nullarmorupload.xyz"; endswith; fast_pattern; reference:md5,d39848a04361b13b0d3c56a84cf5cfd4; classtype:misc-activity; sid:2064062; rev:1; metadata:attack_target Client_Endpoint, created_at 2025_08_20, deployment Perimeter, confidence High, signature_severity Informational, tag FileSharing, tag TA_Abused_Online_Service, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2025_08_20;)
References
| md5 | d39848a04361b13b0d3c56a84cf5cfd4 |
Metadata
attack targetClient_Endpoint
created at2025_08_20
deploymentPerimeter
confidenceHigh
signature severityInformational
tagDescription_Generated_By_Proofpoint_Nexus
updated at2025_08_20
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