Medium Severity
Attachment: Encrypted Microsoft Office file (unsolicited)
Labels
Description
Encrypted OLE2 (eg Microsoft Office) attachment from an unsolicited sender. Attachment encryption is a common technique used to bypass malware scanning products.
Use if receiving encrypted attachments is not normal behavior in your environment.
References
Sublime Security
Created Aug 17th, 2023 • Last updated Nov 1st, 2023
Feed Source
Sublime Core Feed
Source
type.inbound
and any(attachments,
.file_extension in~ $file_extensions_macros
and file.oletools(.).indicators.encryption.exists
)
and (
not profile.by_sender().solicited
or (
profile.by_sender().any_messages_malicious_or_spam
and not profile.by_sender().any_false_positives
)
)
Playground
Test against your own EMLs or sample data.