We are sharing this information with our customers and the security community to emphasize the critical nature of these vulnerabilities and the importance of patching all affected systems immediately to protect against these exploits and prevent future abuse across the ecosystem. We have established a resource center that is constantly updated as more information becomes available at.
#Microsoft data breach 2021 update
We strongly urge customers to update on-premises systems immediately. The vulnerabilities recently being exploited were CVE-2021-26855, CVE-2021-26857, CVE-2021-26858, and CVE-2021-27065, all of which were addressed in today’s Microsoft Security Response Center (MSRC) release – Multiple Security Updates Released for Exchange Server. Microsoft Threat Intelligence Center (MSTIC) attributes this campaign with high confidence to HAFNIUM, a group assessed to be state-sponsored and operating out of China, based on observed victimology, tactics and procedures. In the attacks observed, the threat actor used these vulnerabilities to access on-premises Exchange servers which enabled access to email accounts, and allowed installation of additional malware to facilitate long-term access to victim environments. Microsoft has detected multiple 0-day exploits being used to attack on-premises versions of Microsoft Exchange Server in limited and targeted attacks. See Scan Exchange log files for indicators of compromise. Update : The Exchange Server team released a script for checking HAFNIUM indicators of compromise (IOCs). To aid customers in investigating these attacks, Microsoft Security Response Center (MSRC) has provided additional resources, including new mitigation guidance: Microsoft Exchange Server Vulnerabilities Mitigations – March 2021 Update : Microsoft sees increased use of these vulnerabilities in attacks targeting unpatched systems by multiple malicious actors beyond HAFNIUM. This information is being shared as TLP:WHITE: CSV format | JSON format The feed of malware hashes and known malicious file paths observed in related attacks is available in both JSON and CSV formats at the below GitHub links. To aid defenders in investigating these attacks where Microsoft security products and tooling may not be deployed, we are releasing a feed of observed indicators of compromise (IOCs). Update : Microsoft continues to see multiple actors taking advantage of unpatched systems to attack organizations with on-premises Exchange Server.
Update : Microsoft released a new one-click mitigation tool, the Microsoft Exchange On-Premises Mitigation Tool, to help customers who do not have dedicated security or IT teams to apply security updates for Microsoft Exchange Server. Update : Microsoft released updated tools and investigation guidance to help IT Pros and incident response teams identify, remediate, defend against associated attacks: Guidance for responders: Investigating and remediating on-premises Exchange Server vulnerabilities. Microsoft Purview Data Lifecycle ManagementĪttacker techniques, tools, and infrastructure.Microsoft Purview Information Protection.Information protection Information protection.Microsoft Priva Subject Rights Requests.Microsoft Purview Communication Compliance.Microsoft Purview Insider Risk Management.
Risk management & privacy Risk management & privacy.Microsoft Intune Endpoint Privilege Management.Endpoint security & management Endpoint security & management.Microsoft Defender External Attack Surface Management.Microsoft Defender Cloud Security Posture Mgmt.Microsoft Defender Vulnerability Management.Microsoft Entra ID (Azure Active Directory).
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