Detections
Explore public detection logic contributed by the community across SIEM and rule languages.
94 detections
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KQL Query
KQL Query
KQL Query
KQL Query from file: Detecting FIDO2 Passkey Abuse
KQL Query
KQL Query from file: Monitor Azure API Secrets Extraction
KQL Query
KQL Query
KQL Query from file: OAuth app using the OD file picker permission
KQL Query from file: Detecting EXO MS Graph Enumeration Attacks
KQL Query from file: Detect Copilot Plugin Installation
'This query looks for diagnostic settings that are removed from a resource.
This could indicate an attacker or malicious internal trying to evade detection before malicious act is performed.
If the diagnostic settings are being deleted as part of a parent resource deletion, the event is ignores.'
This could indicate an attacker or malicious internal trying to evade detection before malicious act is performed.
If the diagnostic settings are being deleted as part of a parent resource deletion, the event is ignores.'
'Identifies a match for SQL Injection attack in the Application gateway WAF logs. The Threshold value in the query can be changed as per your infrastructure's requirement.
References: https://owasp.org/Top10/A03_2021-Injection/'
References: https://owasp.org/Top10/A03_2021-Injection/'
This query looks for anomalies in mail item access events made by Graph API. It uses standard deviation to determine if the number of events is anomalous. The query returns all clientIDs where the amount of mail sent per day was larger than value given by the formula, 'average + STDThreshold(2.5)*(standard deviation)'.
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
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
'Identifies when a new user is granted access and starts creating resources in Azure. This can help you identify rogue or malicious user behavior.'
"This query searches for any action type with high frequency that involves adding, modifying, or removing something in cloud app policies. It sees where the properties are modified such that the old value and new value are different for every property except for minor property changes such as Display Name."
Use this query to review OAuth applications whose behaviour has changed as compared to a prior baseline period. The following query returns OAuth Applications accessing user mail via Graph that did not do so in the preceding week.
This query will find applications that have been granted Mail.Read or Mail.ReadWrite permissions in which the corresponding user recently consented to. It can help identify applications that have been abused to gain access to user email.
The actor, Nobelium, was observed modifying existing tenant application permissions to allow them to read user email through the Microsoft Graph API. See Customer Guidance on Recent Nation-State Cyber Attacks.
This query is insprired by an Azure Sentinel detection.
References:
https://msrc-blog.microsoft.com/2020/12/13/customer-guidance-on-recent-nation-state-cyber-attacks/
https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/MailPermissionsAddedToApplication.yaml
The actor, Nobelium, was observed modifying existing tenant application permissions to allow them to read user email through the Microsoft Graph API. See Customer Guidance on Recent Nation-State Cyber Attacks.
This query is insprired by an Azure Sentinel detection.
References:
https://msrc-blog.microsoft.com/2020/12/13/customer-guidance-on-recent-nation-state-cyber-attacks/
https://github.com/Azure/Azure-Sentinel/blob/master/Detections/AuditLogs/MailPermissionsAddedToApplication.yaml
"This query searches for any files in Cloud App Events that have trigger a security alert."
As described in previous guidance, Nobelium may re-purpose legitimate existing OAuth Applications in the environment to their own ends. However, malicious activity patterns may be discernable from legitimate ones.
The following query returns OAuth Applications that access mail both directly and via Graph, allowing review of whether such dual access methods follow expected use patterns.
Reference - https://msrc-blog.microsoft.com/2020/12/13/customer-guidance-on-recent-nation-state-cyber-attacks/
The following query returns OAuth Applications that access mail both directly and via Graph, allowing review of whether such dual access methods follow expected use patterns.
Reference - https://msrc-blog.microsoft.com/2020/12/13/customer-guidance-on-recent-nation-state-cyber-attacks/
This query helps you review all OAuth applications accessing user mail via Graph. It could return a significant number of results depending on how many applications are deployed in the environment.
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