Outlook Task/Note Reminder Received

Detects changes to the registry values related to outlook that indicates that a reminder was triggered for a Note or Task item. This could be a sign of exploitation of CVE-2023-23397. Further investigation is required to determine the success of an exploitation.

Sigma rule (View on GitHub)

 1title: Outlook Task/Note Reminder Received
 2id: fc06e655-d98c-412f-ac76-05c2698b1cb2
 3status: test
 4description: Detects changes to the registry values related to outlook that indicates that a reminder was triggered for a Note or Task item. This could be a sign of exploitation of CVE-2023-23397. Further investigation is required to determine the success of an exploitation.
 5references:
 6    - https://www.microsoft.com/en-us/security/blog/2023/03/24/guidance-for-investigating-attacks-using-cve-2023-23397/
 7author: Nasreddine Bencherchali (Nextron Systems)
 8date: 2023/04/05
 9modified: 2023/08/17
10tags:
11    - attack.persistence
12    - attack.t1137
13    - cve.2023.23397
14    - detection.emerging_threats
15logsource:
16    category: registry_set
17    product: windows
18detection:
19    selection:
20        TargetObject|contains|all:
21            - '\SOFTWARE\Microsoft\Office\'
22            - '\Outlook\'
23        TargetObject|contains:
24            - '\Tasks\'
25            - '\Notes\'
26    condition: selection
27falsepositives:
28    - Legitimate reminders received for a task or a note will also trigger this rule.
29level: low

References

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