Azure Sentinel
@AzureSentinel50 followers944 downloads1,418 copies43 likes37,654 views
1,223 detections
Filters
Last updated
All Time
Detection languages
1,223
Categories
220
218
180
171
135
Platforms
766
284
188
78
29
Products / Services
492
297
159
152
93
MITRE Techniques
530
485
467
348
348
'This query will identify the Microsoft Defender Antivirus Security Intelligence version, Security Intelligence up to date value, Engine version, Engine up to date value, Product version (aka Platform version),Product (aka Platform) up to date value, Security Intelligence publish/build timestamp, Security intel refresh timestamp and provide a list of devices with these details.'
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
'Looks for users retrieving BitLocker keys. Enriches these logs with a summary of alerts associated with the user accessing the keys.
Use this query to start looking for anomalous patterns of key retrieval.
Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-devices#bitlocker-key-retrieval'
Use this query to start looking for anomalous patterns of key retrieval.
Ref: https://docs.microsoft.com/azure/active-directory/fundamentals/security-operations-devices#bitlocker-key-retrieval'
'This hunting query will identify where a file is uploaded to Azure File or Blob storage
and is then accessed once before being deleted. This activity may be indicative of
exfiltration activity.'
and is then accessed once before being deleted. This activity may be indicative of
exfiltration activity.'
This query was originally published in the threat analytics report, Ryuk ransomware. There is also a related blog.
Ryuk is human-operated ransomware. Much like DoppelPaymer ransomware, Ryuk is spread manually, often on networks that are already infected with Trickbot.
Ryuk operators use PsExec to manually spread the ransomware to other devices.
The following query detects remote file creation events that might indicate an active attack.
The See also section below lists links to other queries associated with Ryuk ransomware.
References:
https://www.microsoft.com/security/blog/2020/03/05/human-operated-ransomware-attacks-a-preventable-disaster/
https://www.microsoft.com/wdsi/threats/malware-encyclopedia-description?Name=Ransom:Win32/Ryuk&threatId=-2147232689
https://www.microsoft.com/security/blog/2020/03/05/human-operated-ransomware-attacks-a-preventable-disaster/
https://docs.microsoft.com/sysinternals/downloads/psexec
Ryuk is human-operated ransomware. Much like DoppelPaymer ransomware, Ryuk is spread manually, often on networks that are already infected with Trickbot.
Ryuk operators use PsExec to manually spread the ransomware to other devices.
The following query detects remote file creation events that might indicate an active attack.
The See also section below lists links to other queries associated with Ryuk ransomware.
References:
https://www.microsoft.com/security/blog/2020/03/05/human-operated-ransomware-attacks-a-preventable-disaster/
https://www.microsoft.com/wdsi/threats/malware-encyclopedia-description?Name=Ransom:Win32/Ryuk&threatId=-2147232689
https://www.microsoft.com/security/blog/2020/03/05/human-operated-ransomware-attacks-a-preventable-disaster/
https://docs.microsoft.com/sysinternals/downloads/psexec
Pivot from downloads detected by Windows Defender Antivirus to other files downloaded from the same sites.
To learn more about the download URL info that is available and see other sample queries,.
Check out this blog post: https://techcommunity.microsoft.com/t5/Threat-Intelligence/Hunting-tip-of-the-month-Browser-downloads/td-p/220454.
To learn more about the download URL info that is available and see other sample queries,.
Check out this blog post: https://techcommunity.microsoft.com/t5/Threat-Intelligence/Hunting-tip-of-the-month-Browser-downloads/td-p/220454.
'This query over Microsoft Entra ID sign-in activity highlights Microsoft Entra ID apps with
an unusually high ratio of distinct geolocations versus total number of authentications'
an unusually high ratio of distinct geolocations versus total number of authentications'
'This query detects domain user accounts creation (event ID 4720) where the username ends with $.
Accounts that end with $ are normally domain computer accounts and when they are created the event ID 4741 is generated instead.
Ref: https://blog.menasec.net/2019/02/threat-hunting-6-hiding-in-plain-sights.html'
Accounts that end with $ are normally domain computer accounts and when they are created the event ID 4741 is generated instead.
Ref: https://blog.menasec.net/2019/02/threat-hunting-6-hiding-in-plain-sights.html'
'Identifies a list of IP addresses with a minimum number (default of 5) of failed logon attempts to AWS Console.
Uses that list to identify any successful Microsoft Entra ID logons from these IPs within the same timeframe.'
Uses that list to identify any successful Microsoft Entra ID logons from these IPs within the same timeframe.'
Credentials were added to an application by UserA, after the application was granted admin consent rights by UserB
The Nobelium activity group has been observed adding credentials (x509 keys or password credentials) for one or more legitimate OAuth Applications or Service Principals, usually with existing Mail.Read or Mail.ReadWrite permissions, which grants the ability to read mail content from Exchange Online via Microsoft Graph or Outlook REST. Examples include mail archiving applications.
See Customer Guidance on Recent Nation-State Cyber Attacks for more on the Nobelium campaign (formerly known as Solorigate).
See Grant tenant-wide admin consent to an application for how to add admin consent to an application.
More Nobelium-related queries can be found listed under the See also section of this document.
References:
https://msrc-blog.microsoft.com/2020/12/13/customer-guidance-on-recent-nation-state-cyber-attacks/
https://docs.microsoft.com/azure/active-directory/manage-apps/grant-admin-consent
The Nobelium activity group has been observed adding credentials (x509 keys or password credentials) for one or more legitimate OAuth Applications or Service Principals, usually with existing Mail.Read or Mail.ReadWrite permissions, which grants the ability to read mail content from Exchange Online via Microsoft Graph or Outlook REST. Examples include mail archiving applications.
See Customer Guidance on Recent Nation-State Cyber Attacks for more on the Nobelium campaign (formerly known as Solorigate).
See Grant tenant-wide admin consent to an application for how to add admin consent to an application.
More Nobelium-related queries can be found listed under the See also section of this document.
References:
https://msrc-blog.microsoft.com/2020/12/13/customer-guidance-on-recent-nation-state-cyber-attacks/
https://docs.microsoft.com/azure/active-directory/manage-apps/grant-admin-consent
Page 32 of 123