Azure Sentinel
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1,223 detections
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'This finds connections to server files requested by only one client. Effective when actor uses static operational IP addresses. Threshold can be modified. Larger execution window increases reliability of results.'
'This query identifies when a new trust monitor event is detected.'
'Rule helps to detect empty and unusual user agent indicating web browsing activity by an unusual process other than a web browser.'
'This query uses Sysmon Image Load (Event ID 7) and Process Create (Event ID 1) data to look for COM Event System being used to load a newly seen DLL.'
'Identifies when failed logon attempts are 20 or higher during a 10 minute period (2 failed logons per minute minimum) from valid account.'
'This hunting query identifies users joining a meeting from a time zone that a user has not been observed from in the last 30 days.'
'Threat actors can use JPEG files to hide malware, or other malicious code from inspection. This query looks for the downloading of abnormally large JPEG files from a source where large JPEG files have not been downloaded.
Ref: https://www.microsoft.com/security/blog/2022/07/27/untangling-knotweed-european-private-sector-offensive-actor-using-0-day-exploits/'
Ref: https://www.microsoft.com/security/blog/2022/07/27/untangling-knotweed-european-private-sector-offensive-actor-using-0-day-exploits/'
This query was originally published in the threat analytics report, Ransomware continues to hit healthcare, critical services. There is also a related blog.
In April of 2020, security researchers observed multiple ransomware campaigns using the same set of techniques.
The following query returns alerts raised when backup files were deleted.
The See also section below lists more queries related to techniques shared by these campaigns.
Reference - https://www.microsoft.com/security/blog/2020/04/28/ransomware-groups-continue-to-target-healthcare-critical-services-heres-how-to-reduce-risk/
In April of 2020, security researchers observed multiple ransomware campaigns using the same set of techniques.
The following query returns alerts raised when backup files were deleted.
The See also section below lists more queries related to techniques shared by these campaigns.
Reference - https://www.microsoft.com/security/blog/2020/04/28/ransomware-groups-continue-to-target-healthcare-critical-services-heres-how-to-reduce-risk/
Microsoft has observed attackers who have gained entry to an environment via the Log4J vulnerability utilizing uncommon PowerShell flags to communicate to command-and-control infrastructure.
LemonDuck is an actively updated and robust malware primarily known for its botnet and cryptocurrency mining objectives. First discovered in 2019, LemonDuck has since adopted more sophisticated behavior and escalated its operations in 2021. Today, beyond using resources for its traditional bot and mining activities, LemonDuck steals credentials, removes security controls, spreads via emails, moves laterally, and ultimately drops more tools for human-operated activity.
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