Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
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This query shows information about high confidence phish email that has been released from the Quarantine.
One of the indicators of compromise for the Nobelium (formerly Solorigate) campaign was that unexpected service principals have been added to privileged roles. This query looks for service principals that have been added to any role.
See Understanding "Solorigate"'s Identity IOCs - for Identity Vendors and their customers..
Reference - https://techcommunity.microsoft.com/t5/azure-active-directory-identity/understanding-quot-solorigate-quot-s-identity-iocs-for-identity/ba-p/2007610
See Understanding "Solorigate"'s Identity IOCs - for Identity Vendors and their customers..
Reference - https://techcommunity.microsoft.com/t5/azure-active-directory-identity/understanding-quot-solorigate-quot-s-identity-iocs-for-identity/ba-p/2007610
This query helps reviewing emails accessed by end users using cloud app events data
This query can be used to detect instances of a malicious insider creating a file archive and then emailing that archive to an external "competitor" organization.
This query provides insights into AIR investigation actions in Microsoft Defender for Office 365.
This query visualises total emails with Malware detections over time summarizing the data daily by Delivery Location.
This query helps to find threats using display name impersonation for users not already protected with User Impersonation
This query checks devices for the presence of files that have been sent by a known malicious sender. To use this query, replace the email address with the address of the known malicious sender.
This query visualises total emails with Malware detections over time summarizing the data daily.
Hunting for credential phishing using the "Referral" infrastructure using Defender for Office 365 data
'This identifies failed logon attempts using permutations based on known first and last names within 10m time windows. Iteration through separators or order changes in the logon name may indicate potential Brute Force logon attempts.'
This query helps reviewing sender IPs sending malicious email of type Malware or Phish
Provides a summary of total number of detections
This query visualises total emails with Phish detections over time summarizing the data daily.
This query shows information about email that has been released from the Quarantine in Defender for Office 365.
Query for links opened from mail apps - if a detection occurred right afterwards.
As there are many links opened from mails, to have a successful hunt we should have some filter or join with some other signal,.
Such as suspicious processes, network connections, etc.
Therefore, in this example, we query for alerts that might be related to links sent via email.
This could be indicative of a phishing or spear-phishing attacks.
Tags: #EmailLink, #Phishing, #GetNearbyAlerts.
Explaining the underlying data:.
This query uses the BrowserLaunchedToOpenUrl event, that includes clicks on http:// or https:// links (clicks outside of browsers), or on .lnk files.
For this event, RemoteUrl contains the opened URL.
As there are many links opened from mails, to have a successful hunt we should have some filter or join with some other signal,.
Such as suspicious processes, network connections, etc.
Therefore, in this example, we query for alerts that might be related to links sent via email.
This could be indicative of a phishing or spear-phishing attacks.
Tags: #EmailLink, #Phishing, #GetNearbyAlerts.
Explaining the underlying data:.
This query uses the BrowserLaunchedToOpenUrl event, that includes clicks on http:// or https:// links (clicks outside of browsers), or on .lnk files.
For this event, RemoteUrl contains the opened URL.
The MailItemsAccessed action is part of the new Advanced Audit functionality of Microsoft Defender XDR. It's part of Exchange mailbox auditing and is enabled by default for users that have an Office 365 or Microsoft 365 E5 license, or for organizations with a Microsoft 365 E5 Compliance add-on subscription.
If more than 1,000 MailItemsAccessed audit records are generated in less than 24 hours, Exchange Online will stop generating auditing records for MailItemsAccessed activity. When a mailbox is throttled, MailItemsAccessed activity will not be logged for 24 hours after the mailbox was throttled. If this occurs, there's a potential that mailbox could have been compromised during this period. The recording of MailItemsAccessed activity will be resumed following a 24-hour period.
The query is looking for MailItemsAccessed Throttling events where the operation is done by a ClientApplication.
See The MailItemsAccessed mailbox auditing action.
Reference - https://docs.microsoft.com/microsoft-365/compliance/mailitemsaccessed-forensics-investigations?view=o365-worldwide#the-mailitemsaccessed-mailbox-auditing-action
If more than 1,000 MailItemsAccessed audit records are generated in less than 24 hours, Exchange Online will stop generating auditing records for MailItemsAccessed activity. When a mailbox is throttled, MailItemsAccessed activity will not be logged for 24 hours after the mailbox was throttled. If this occurs, there's a potential that mailbox could have been compromised during this period. The recording of MailItemsAccessed activity will be resumed following a 24-hour period.
The query is looking for MailItemsAccessed Throttling events where the operation is done by a ClientApplication.
See The MailItemsAccessed mailbox auditing action.
Reference - https://docs.microsoft.com/microsoft-365/compliance/mailitemsaccessed-forensics-investigations?view=o365-worldwide#the-mailitemsaccessed-mailbox-auditing-action
This query graphs top accounts performing user submissions
Detects changes and updates to the user risk and MFA registration policy.
Attackers can modified the policies to Bypass MFA, weaken security thresholds, facilitate further attacks, maintain persistence.
Attackers can modified the policies to Bypass MFA, weaken security thresholds, facilitate further attacks, maintain persistence.
This query correlates Microsoft Defender for Office 365 signals and Microsoft Entra ID identity data to find the relevant endpoint event BrowerLaunchedToOpen in Microsoft Defender ATP.
This event reflects relevant clicks on the malicious URL in the spear-phishing email recognized by Microsoft Defender for Office 365.
This event reflects relevant clicks on the malicious URL in the spear-phishing email recognized by Microsoft Defender for Office 365.
This query identifies when a user clicks a link that opens a browser to navigate to a URL
which uses redirection. It then filters out any redirections to URLs in the same DNS namespace
as the originating URL. Redirection identification is done based on URL query parameters
outlined in the following article: https://www.bleepingcomputer.com/news/security/snapchat-amex-sites-abused-in-microsoft-365-phishing-attacks/
which uses redirection. It then filters out any redirections to URLs in the same DNS namespace
as the originating URL. Redirection identification is done based on URL query parameters
outlined in the following article: https://www.bleepingcomputer.com/news/security/snapchat-amex-sites-abused-in-microsoft-365-phishing-attacks/
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