ET USER_AGENTS Microsoft Office Existence Discovery User-Agent
Sourceet/open
CreatedNovember 30, 2022
UpdatedNovember 30, 2022
Classificationmisc-activity
alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET USER_AGENTS Microsoft Office Existence Discovery User-Agent"; flow:established,to_server; http.user_agent; content:"Microsoft Office Existence Discovery"; bsize:36; threshold:type both, track by_src, count 1, seconds 600; classtype:misc-activity; sid:2041131; rev:1; metadata:attack_target Client_Endpoint, created_at 2022_11_30, deployment Perimeter, confidence High, signature_severity Informational, tag Description_Generated_By_Proofpoint_Nexus, updated_at 2022_11_30, reviewed_at 2025_10_24;)
Metadata
attack targetClient_Endpoint
created at2022_11_30
deploymentPerimeter
confidenceHigh
signature severityInformational
tagDescription_Generated_By_Proofpoint_Nexus
updated at2022_11_30
reviewed at2025_10_24
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