T1080 Taint Shared Content

This diagnostic statement provides for implementation of methods to block similar future attacks via security tools such as antivirus and IDS/IPS to provide protection against threats and exploitation attempts.

This diagnostic statement implements technical controls (e.g., VPN, antivirus software) to address the risks of end-user personal computing devices accessing the organization’s network and resources.

Antivirus/Antimalware software can be utilized to detect and quarantine suspicious files.

The diagnostic statement highlights several mechanisms that organizations can implement to protect endpoint systems using virtualization technologies, essentially hypervisor hardening. With this technique, adversaries may deliver payloads to host systems by adding content to shared storage and file locations, such as a shared directory between the host and virtual machine. Hypervisor hardening can restrict or limit the ability to of the virtualized machine to taint shared content, making it harder for attackers to manipulate shared content.

This diagnostic statement protects against Taint Shared Content through the use of limiting access to resources to only authorized devices, management of personal computing devices, network intrusion prevention, and the use of antimalware.

The Microsoft Sentinel Analytics "Potential Build Process Compromise" query can detect when source code files have been modified immediately after the build process has started. The Microsoft Sentinel Analytics "ADO Build Variable Modified by New User" query may indicate malicious modification to the build process to taint shared content. The coverage for these queries is minimal (specific to Azure DevOps) resulting in an overall Minimal score.

When a file is suspected to contain malware, Security Center displays an alert and can optionally email the storage owner for approval to delete the suspicious file. This delete response capability leads to a Response type of Eradication although it is specific to Azure Blob, Azure Files and Azure Data Lake Storage storage types resulting in an overall score of Partial.

This control may alert on upload of possible malware or executable and Azure Cloud Services Package files. These alerts are dependent on Microsoft threat intelligence and may not alert on novel or modified malware.

This control's "Immutable (read-only) root filesystem should be enforced for containers" and "Usage of pod HostPath volume mounts should be restricted to a known list to restrict node access from compromised containers" recommendations can mitigate this technique. Due to it being a recommendation, its score is capped at Partial.

Microsoft Secure Score is a measurement of an organization's security posture, with a higher number indicating more recommended actions taken. It can be found at Microsoft Secure Score in the Microsoft Defender portal. Following the Secure Score recommendations can protect your organization from threats. From a centralized dashboard in the Microsoft Defender portal, organizations can monitor and work on the security of their Microsoft 365 identities, apps, and devices. Your score is updated in real time to reflect the information presented in the visualizations and recommended action pages. Secure Score also syncs daily to receive system data about your achieved points for each action. To help you find the information you need more quickly, Microsoft recommended actions are organized into groups: Identity (Microsoft Entra accounts & roles) Device (Microsoft Defender for Endpoint, known as Microsoft Secure Score for Devices) Apps (email and cloud apps, including Office 365 and Microsoft Defender for Cloud Apps) Data (through Microsoft Information Protection)

In Microsoft 365 organizations with mailboxes in Exchange Online or standalone Exchange Online Protection (EOP) organizations without Exchange Online mailboxes, email messages are automatically protected against malware by EOP. Some of the major categories of malware are: Viruses that infect other programs and data, and spread through your computer or network looking for programs to infect. Spyware that gathers your personal information, such as sign-in information and personal data, and sends it back to its author. Ransomware that encrypts your data and demands payment to decrypt it. Anti-malware software doesn't help you decrypt encrypted files, but it can detect the malware payload that's associated with the ransomware. EOP offers multi-layered malware protection that's designed to catch all known malware in Windows, Linux, and Mac that travels into or out of your organization. The following options help provide anti-malware protection: Layered defenses against malware: Multiple anti-malware scan engines help protect against both known and unknown threats. These engines include powerful heuristic detection to provide protection even during the early stages of a malware outbreak. This multi-engine approach has been shown to provide significantly more protection than using just one anti-malware engine. Real-time threat response: During some outbreaks, the anti-malware team might have enough information about a virus or other form of malware to write sophisticated policy rules that detect the threat, even before a definition is available from any of the scan engines used by the service. These rules are published to the global network every 2 hours to provide your organization with an extra layer of protection against attacks. Fast anti-malware definition deployment: The anti-malware team maintains close relationships with partners who develop anti-malware engines. As a result, the service can receive and integrate malware definitions and patches before they're publicly released. Our connection with these partners often allows us to develop our own remedies as well. The service checks for updated definitions for all anti-malware engines every hour. License Requirements: M365 E3 or Microsoft Defender for Office plan 1.

In Exchange Online Protection (EOP) and Microsoft Defender for Office 365, quarantine policies allow admins to define the user experience for quarantined messages. Traditionally, users have been allowed or denied levels of interactivity with quarantine messages based on why the message was quarantined. For example, users can view and release messages that were quarantined as spam or bulk, but they can't view or release messages that were quarantined as high confidence phishing or malware. The following M365 features are supported by quarantine policies, “Response” to Anti-malware and Anti-Phishing tagged items. Files that are quarantined as malware by Safe Attachments for SharePoint, OneDrive, and Microsoft Teams. License requirements: M365 E3 (or Defender for Office plan 1)

Zero-hour auto purge (ZAP) is a protection feature in Exchange Online Protection (EOP) that retroactively detects and neutralizes malicious phishing, spam, or malware messages that have already been delivered to Exchange Online mailboxes. With the E5 licensing or Office Plan 2, ZAP is also able to retroactively detect existing malicious chat messages in Microsoft Teams that are identified as malware or high confidence phishing. License Requirements: ZAP for Defender O365 is included with M365's E3 and requires E5 when leveraging ZAP for Teams security.