Azure Sentinel
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'Identifies attempts to modify registry ACL to evade security solutions. In the Solorigate attack, the attackers were found modifying registry permissions so services.exe cannot access the relevant registry keys to start the service.
The detection leverages Security Event as well as MDE data to identify when specific security services registry permissions are modified.
Only some portions of this detection are related to Solorigate, it also includes coverage for some common tools that perform this activity.
Reference on guidance for enabling registry auditing:
- https://docs.microsoft.com/windows/security/threat-protection/auditing/advanced-security-auditing-faq
- https://docs.microsoft.com/windows/security/threat-protection/auditing/appendix-a-security-monitoring-recommendations-for-many-audit-events
- https://docs.microsoft.com/windows/security/threat-protection/auditing/audit-registry
- https://docs.microsoft.com/windows/security/threat-protection/auditing/event-4670
- For the event 4670 to be created the audit policy for the registry must have auditing enabled for Write DAC and/or Write Owner
- https://github.com/OTRF/Set-AuditRule
- https://docs.microsoft.com/dotnet/api/system.security.accesscontrol.registryrights?view=dotnet-plat-ext-5.0'
The detection leverages Security Event as well as MDE data to identify when specific security services registry permissions are modified.
Only some portions of this detection are related to Solorigate, it also includes coverage for some common tools that perform this activity.
Reference on guidance for enabling registry auditing:
- https://docs.microsoft.com/windows/security/threat-protection/auditing/advanced-security-auditing-faq
- https://docs.microsoft.com/windows/security/threat-protection/auditing/appendix-a-security-monitoring-recommendations-for-many-audit-events
- https://docs.microsoft.com/windows/security/threat-protection/auditing/audit-registry
- https://docs.microsoft.com/windows/security/threat-protection/auditing/event-4670
- For the event 4670 to be created the audit policy for the registry must have auditing enabled for Write DAC and/or Write Owner
- https://github.com/OTRF/Set-AuditRule
- https://docs.microsoft.com/dotnet/api/system.security.accesscontrol.registryrights?view=dotnet-plat-ext-5.0'
'This detection will identify network requests in HTTP proxy data that contains Base64 encoded IP addresses. After identifying candidates the query joins with DeviceNetworkEvents to idnetify any machine within the network using that IP address. Alerts indicate that the IP address of a machine within your network was seen with it's IP address base64 encoded in an outbound web request. This method of egressing the IP was seen used in POLONIUM's RunningRAT tool, however the detection is generic.'
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 detects attempts to use fsutil.exe to clear system logs and delete forensic artifacts.
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 detects attempts to use fsutil.exe to clear system logs and delete forensic artifacts.
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/
This query was originally published in the threat analytics report, Sysrv botnet evolution.
Sysrv is a Go-based botnet that targets both Windows and Linux servers, and steals resources to mine cryptocurrency.
The following query finds instances of remote code execution on a vulnerable Linux server.
Sysrv is a Go-based botnet that targets both Windows and Linux servers, and steals resources to mine cryptocurrency.
The following query finds instances of remote code execution on a vulnerable Linux server.
This query will hunt for files matching the current abuse.ch recent threat feed based on Sha256. Currently the query is set up to analyze the last day worth of events, but this is configurable using the MaxAge variable.
This query was originally published in the threat analytics report, "Exchange Server zero-days exploited in the wild".
In early March 2021, Microsoft released patches for four different zero-day vulnerabilities affecting Microsoft Exchange Server. The vulnerabilities were being used in a coordinated attack. For more information on the vulnerabilities, visit the following links:
1. CVE-2021-26855
2. CVE-2021-26857
3. CVE-2021-26858
4. CVE-2021-27065
The following query detects downloads of powercat, an exploitation tool for PowerShell. Although associated with these zero-day attacks, powercat is a multi-purpose tool that is also used by other groups of attackers.
More queries related to this threat can be found under the See also section of this page.
Reference - https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server/
In early March 2021, Microsoft released patches for four different zero-day vulnerabilities affecting Microsoft Exchange Server. The vulnerabilities were being used in a coordinated attack. For more information on the vulnerabilities, visit the following links:
1. CVE-2021-26855
2. CVE-2021-26857
3. CVE-2021-26858
4. CVE-2021-27065
The following query detects downloads of powercat, an exploitation tool for PowerShell. Although associated with these zero-day attacks, powercat is a multi-purpose tool that is also used by other groups of attackers.
More queries related to this threat can be found under the See also section of this page.
Reference - https://msrc-blog.microsoft.com/2021/03/02/multiple-security-updates-released-for-exchange-server/
C2-NamedPipe
KQL
Detects the creation of a named pipe used by known APT malware.
Reference - https://docs.microsoft.com/openspecs/windows_protocols/ms-wpo/4de75e21-36fd-440a-859b-75accc74487c
Reference - https://docs.microsoft.com/openspecs/windows_protocols/ms-wpo/4de75e21-36fd-440a-859b-75accc74487c
'Attacker can exfiltrate data from your GitHub repository by cloning it. This hunting query tracks clone activities for each repository, allowing quick identification of anomalies/excessive clones to investigate repo access & permissions.'
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
'This query looks for unfamiliar Sign-in's thats not seen recently for the given user
with azure portal login attempts and audit logs to help detect and reduce the analysis timeline for defenders'
with azure portal login attempts and audit logs to help detect and reduce the analysis timeline for defenders'
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