Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This query visualises the total ammount of user false negative or false positive submissions by the verdict of the submission grading.
Identifies the top 10 external sender addresses delivering inbound emails classified as phishing.
If you want to exclude your own organization's domains (including subdomains), add a filter after the phishing filter, e.g.:
| where SenderFromAddress !contains ".yourdomain.com"
(Replace "yourdomain.com" with your actual domain.)
Based on Defender for Office 365 workbook: https://techcommunity.microsoft.com/blog/microsoftdefenderforoffice365blog/part-2-build-custom-email-security-reports-and-dashboards-with-workbooks-in-micr/4411303
If you want to exclude your own organization's domains (including subdomains), add a filter after the phishing filter, e.g.:
| where SenderFromAddress !contains ".yourdomain.com"
(Replace "yourdomain.com" with your actual domain.)
Based on Defender for Office 365 workbook: https://techcommunity.microsoft.com/blog/microsoftdefenderforoffice365blog/part-2-build-custom-email-security-reports-and-dashboards-with-workbooks-in-micr/4411303
Identifies the top 10 external sender addresses delivering inbound emails classified as spam.
To exclude your own organization's domains (including subdomains), add a filter after the spam filter, e.g.:
| where SenderFromAddress !contains ".yourdomain.com"
(Replace "yourdomain.com" with your actual domain.)
Based on Defender for Office 365 workbook: https://techcommunity.microsoft.com/blog/microsoftdefenderforoffice365blog/part-2-build-custom-email-security-reports-and-dashboards-with-workbooks-in-micr/4411303
To exclude your own organization's domains (including subdomains), add a filter after the spam filter, e.g.:
| where SenderFromAddress !contains ".yourdomain.com"
(Replace "yourdomain.com" with your actual domain.)
Based on Defender for Office 365 workbook: https://techcommunity.microsoft.com/blog/microsoftdefenderforoffice365blog/part-2-build-custom-email-security-reports-and-dashboards-with-workbooks-in-micr/4411303
This query visualises the total amount of spam emails that are quarantined, summarized by the detection method
This query visualises the daily amount of emails that had a post delivery action from zero-hour auto purge, summarizing by phish,spam or malware detection action
This query visualises the amount of emails that had a post delivery action, summarizing the data daily by the final location as a result of the action
This query visualises the daily amount of emails that had an admin post delivery action, summarizing the data by action type
This query visualises emails released from quarantine and summarizing the result by the original filter verdict
This query looks for Teams messages from an external user with a suspicious display name.
This query helps reviewing recipients who are potentially victim of email bombing attacks
This query helps to hunt for possible email bombing attacks in Microsoft Defender for Office 365.
'Often times after the initial compromise the attackers create inbox rules to delete emails that contain certain keywords.
This is done so as to limit ability to warn compromised users that they've been compromised. Below is a sample query that tries to detect this.
Reference: https://www.reddit.com/r/sysadmin/comments/7kyp0a/recent_phishing_attempts_my_experience_and_what/'
This is done so as to limit ability to warn compromised users that they've been compromised. Below is a sample query that tries to detect this.
Reference: https://www.reddit.com/r/sysadmin/comments/7kyp0a/recent_phishing_attempts_my_experience_and_what/'
In this query, we hunt for inbound emails having URLs from QR codes and suspicious keywords in subject
This query helps hunting for Inbox rule changes which forward-redirect email
This query visualises the total amount of emails subject to an admin policy with action of allow, independent of action taken, summarizing the data by type of override
Listing Email Remediation Actions performed via Explorer in Defender for Office 365
Graph of MDO detections trended over time
This query looks for users accessing multiple other users' mailboxes, or accessing multiple folders in another user's mailbox.
This query is inspired by an Azure Sentinel detection.
Reference - https://github.com/Azure/Azure-Sentinel/blob/master/Hunting%20Queries/OfficeActivity/AnomolousUserAccessingOtherUsersMailbox.yaml
This query is inspired by an Azure Sentinel detection.
Reference - https://github.com/Azure/Azure-Sentinel/blob/master/Hunting%20Queries/OfficeActivity/AnomolousUserAccessingOtherUsersMailbox.yaml
In this query, we hunt for inbound emails having URLs from QR codes and send by non-prevalent senders
This query helps in reviewing malicious emails allowed due to admin overrides
Identifies anomalous increases in Exchange mail items accessed operations.
The query leverages KQL built-in anomaly detection algorithms to find large deviations from baseline patterns.
Sudden increases in execution frequency of sensitive actions should be further investigated for malicious activity.
Manually change scorethreshold from 1.5 to 3 or higher to reduce the noise based on outliers flagged from the query criteria.
Read more about MailItemsAccessed- https://docs.microsoft.com/microsoft-365/compliance/advanced-audit?view=o365-worldwide#mailitemsaccessed
Query insprired by Azure Sentinel detection https://github.com/Azure/Azure-Sentinel/blob/master/Detections/OfficeActivity/MailItemsAccessedTimeSeries.yaml
The query leverages KQL built-in anomaly detection algorithms to find large deviations from baseline patterns.
Sudden increases in execution frequency of sensitive actions should be further investigated for malicious activity.
Manually change scorethreshold from 1.5 to 3 or higher to reduce the noise based on outliers flagged from the query criteria.
Read more about MailItemsAccessed- https://docs.microsoft.com/microsoft-365/compliance/advanced-audit?view=o365-worldwide#mailitemsaccessed
Query insprired by Azure Sentinel detection https://github.com/Azure/Azure-Sentinel/blob/master/Detections/OfficeActivity/MailItemsAccessedTimeSeries.yaml
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