Azure Sentinel
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Looks for suspicious keyword additions to windows registry.
Author: Jouni Mikkola
References:
https://threathunt.blog/registry-hunts/
Author: Jouni Mikkola
References:
https://threathunt.blog/registry-hunts/
To evade security software and analyst tools, Nobelium malware enumerates the target system looking for certain running processes, loaded drivers, and registry keys, with the goal of disabling them.
The Microsoft Defender for Endpoint sensor is one of the processes the malware attempts to disable.
Microsoft Defender for Endpoint has built-in protections against many techniques attackers use to disable endpoint sensors ranging from hardened OS protection, anti-tampering policies, and detections for a variety of tampering attempts, including "Attempt to stop Microsoft Defender for Endpoint sensor", "Tampering with Microsoft Defender for Endpoint sensor settings", or "Possible sensor tampering in memory".
Successfully disabling Microsoft Defender for Endpoint can prevent the system from reporting observed activities.
However, the multitude of signals reported into Microsoft Defender XDR provides a unique opportunity to hunt for systems where the tampering technique used might have been successful.
The following advanced hunting query can be used to locate devices that should be reporting but aren't:
The Microsoft Defender for Endpoint sensor is one of the processes the malware attempts to disable.
Microsoft Defender for Endpoint has built-in protections against many techniques attackers use to disable endpoint sensors ranging from hardened OS protection, anti-tampering policies, and detections for a variety of tampering attempts, including "Attempt to stop Microsoft Defender for Endpoint sensor", "Tampering with Microsoft Defender for Endpoint sensor settings", or "Possible sensor tampering in memory".
Successfully disabling Microsoft Defender for Endpoint can prevent the system from reporting observed activities.
However, the multitude of signals reported into Microsoft Defender XDR provides a unique opportunity to hunt for systems where the tampering technique used might have been successful.
The following advanced hunting query can be used to locate devices that should be reporting but aren't:
This query was originally published in the threat analytics report, CVE-2020-0601 certificate validation vulnerability.
The Windows CryptoAPI Spoofing Vulnerability, CVE-2020-0601, can be exploited to spoof code-signing certificates. For example, an attacker could forge a certificate that lists Microsoft as the issuer. This would allow an attacker to disguise a malicious executable as legitimate.
The vulnerability was patched with the January 2020 Security Update.
Use the following query to locate files containing ECC certificates that might have been forged using this vulnerability. The query identifies files that don't correctly identify the signer name, yet list Microsoft as the root signer.
References:
https://portal.msrc.microsoft.com/security-guidance/advisory/CVE-2020-0601
https://portal.msrc.microsoft.com/security-guidance/releasenotedetail/2020-Jan
The Windows CryptoAPI Spoofing Vulnerability, CVE-2020-0601, can be exploited to spoof code-signing certificates. For example, an attacker could forge a certificate that lists Microsoft as the issuer. This would allow an attacker to disguise a malicious executable as legitimate.
The vulnerability was patched with the January 2020 Security Update.
Use the following query to locate files containing ECC certificates that might have been forged using this vulnerability. The query identifies files that don't correctly identify the signer name, yet list Microsoft as the root signer.
References:
https://portal.msrc.microsoft.com/security-guidance/advisory/CVE-2020-0601
https://portal.msrc.microsoft.com/security-guidance/releasenotedetail/2020-Jan
Directly prior to deploying Macaw ransomware in an organization, the attacker will run several commands designed to disable security tools and system recovery tools.
'Detects changes to the ownership of an appplicaiton.
Monitor these changes to make sure that they were authorized.
Ref: https://learn.microsoft.com/en-gb/entra/architecture/security-operations-applications#new-owner'
Monitor these changes to make sure that they were authorized.
Ref: https://learn.microsoft.com/en-gb/entra/architecture/security-operations-applications#new-owner'
This query make a best-guess detection regarding which removable media device caused an AV detection.
The query is best run over 30 days to get the full USB history.
Get a list of USB AV detections. This assumes any path not beginning with C is a removable/USB device.
The query is best run over 30 days to get the full USB history.
Get a list of USB AV detections. This assumes any path not beginning with C is a removable/USB device.
This query looks for signs of impacket psexec module usage. May hit other psexec-like techniques too.
Author: Jouni Mikkola
More info: https://threathunt.blog/impacket-psexec/
Author: Jouni Mikkola
More info: https://threathunt.blog/impacket-psexec/
This query helps in determining clickthroughs when email delivered because of detection overrides.
This detection approach correlates a user accessing an email with image/document attachments and a risky sign-in attempt from non-trusted devices.
Intent:
- Use MTP capability to look for insider threat potential risk indicators
- Indicators would then serve as the building block for insider threat risk modeling in subsequent tools
Definition of Insider Threat:
"The potential for an individual who has or had authorized access to an organization's assets to use their access, either maliciously or unintentionally, to act in a way that could negatively affect the organization."
This collection of queries describes the different indicators that could be used to model and look for patterns suggesting an increased risk of an individual becoming a potential insider threat.
Note: no single indicator should be used as a lone determinant of insider threat activity, but should be part of an overall program to understand the increased risk to your organization's critical assets. This in turn is used to feed an investigation by a formal insider threat program to look at the context associated with the whole person to understand the implication of a set of indicators.
- Use MTP capability to look for insider threat potential risk indicators
- Indicators would then serve as the building block for insider threat risk modeling in subsequent tools
Definition of Insider Threat:
"The potential for an individual who has or had authorized access to an organization's assets to use their access, either maliciously or unintentionally, to act in a way that could negatively affect the organization."
This collection of queries describes the different indicators that could be used to model and look for patterns suggesting an increased risk of an individual becoming a potential insider threat.
Note: no single indicator should be used as a lone determinant of insider threat activity, but should be part of an overall program to understand the increased risk to your organization's critical assets. This in turn is used to feed an investigation by a formal insider threat program to look at the context associated with the whole person to understand the implication of a set of indicators.
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