MediumSigmaHQ Nasreddine Bencherchali (Nextron Systems)

OneNote Attachment File Dropped In Suspicious Location

Detects creation of files with the ".one"/".onepkg" extension in suspicious or uncommon locations. This could be a sign of attackers abusing OneNote attachments

Detection logic

Detection requirements

Log source product: windows
Log source category: file_event

Known benign triggers

Legitimate usage of ".one" or ".onepkg" files from those locations

References

Links the source published beside this detection. Reference is the link the source wrote, unmodified. Class is decided by this catalogue from the host and path, not stated by the source. Cited by counts published detections citing the same resource, including this one, and the sources beneath it count the repositories this catalogue ingests, which is not the same as independent research.
Reference	Class	Cited by
blog.osarmor.com/319/onenote-attachment-delivers-asyncrat-malware/	Unclassified	3
www.bleepingcomputer.com/news/security/hackers-now-use-microsoft-onenote-attachments-to-spread-malware/	Security research	3from 2 sources

Detection rules

OneNote Attachment File Dropped In Suspicious Location

Detection logic

Detection requirements

Known benign triggers

MITRE ATT&CK mappings

References

From the source

Licence

Authorship

Detection rules