Malware

Today, CISA issued Emergency Directive (ED) 25-02: Mitigate Microsoft Exchange Vulnerability in response to CVE-2025-53786, a vulnerability in Microsoft Exchange server hybrid deployments.   ED 25-02 directs all Federal Civilian Executive Branch (FCEB) agencies with Microsoft Exchange hybrid environments to implement required mitigations by 9:00 AM EDT on Monday, August 11, 2025.  This vulnerability presents significant risk to all organizations operating Microsoft Exchange hybrid-joined configurations that have not yet implemented the April 2025 patch guidance.…

Read More

CISA published a Malware Analysis Report (MAR) with analysis and associated detection signatures on files related to Microsoft SharePoint vulnerabilities: CVE-2025-49704 [CWE-94: Code Injection], CVE-2025-49706 [CWE-287: Improper Authentication], CVE-2025-53770 [CWE-502: Deserialization of Untrusted Data], and CVE-2025-53771 [CWE-287: Improper Authentication] Cyber threat actors have chained CVE-2025-49704 and CVE-2025-49706 (in an exploit chain publicly known as “ToolShell”) to gain unauthorized access to on-premises SharePoint servers. CISA analyzed six files including two Dynamic Link-Library (.DLL), one cryptographic key…

Read More

Note: This Alert may be updated to reflect new guidance issued by CISA or other parties.  CISA is aware of the newly disclosed high-severity vulnerability, CVE-2025-53786, that allows a cyber threat actor with administrative access to an on-premise Microsoft Exchange server to escalate privileges by exploiting vulnerable hybrid-joined configurations. This vulnerability, if not addressed, could impact the identity integrity of an organization’s Exchange Online service.  While Microsoft has stated there is no observed exploitation as of…

Read More

Today, CISA, in partnership with Sandia National Laboratories, announced the public availability of Thorium, a scalable and distributed platform for automated file analysis and result aggregation. Thorium enhances cybersecurity teams’ capabilities by automating analysis workflows through seamless integration of commercial, open-source, and custom tools. It supports various mission functions, including software analysis, digital forensics, and incident response, allowing analysts to efficiently assess complex malware threats. Thorium enables teams that frequently analyze files to achieve scalable…

Read More

CISA, in partnership with the U.S. Coast Guard (USCG), released a joint Cybersecurity Advisory aimed at helping critical infrastructure organizations improve their cyber hygiene. This follows a proactive threat hunt engagement conducted at a U.S. critical infrastructure facility. During this engagement, CISA and USCG did not find evidence of malicious cyber activity or actor presence on the organization’s network but did identify several cybersecurity risks. CISA and USCG are sharing their findings and associated mitigations…

Read More

Today, CISA released the Eviction Strategies Tool to provide cyber defenders with critical support and assistance during the containment and eviction phases of incident response. This tool includes: Cyber Eviction Strategies Playbook Next Generation (Playbook-NG): A web-based application for next-generation operations. COUN7ER: A database of atomic post-compromise countermeasures users can execute based on adversary tactics, techniques, and procedures. Together, Playbook-NG and COUN7ER create a systematic, tailored eviction plan that leverages distinct countermeasures to effectively contain…

Read More

CISA released Microsegmentation in Zero Trust, Part One: Introduction and Planning as part of its ongoing efforts to support Federal Civilian Executive Branch (FCEB) agencies implementing zero trust architectures (ZTAs).  This guidance provides a high-level overview of microsegmentation, focusing on its key concepts, associated challenges and potential benefits, and includes recommended actions to modernize network security and advance zero trust principles. Microsegmentation is a critical component of ZTA that reduces the attack surface, limits lateral…

Read More

CISA, along with the Federal Bureau of Investigation, Canadian Centre for Cyber Security, Royal Canadian Mounted Police, the Australian Cyber Security Centre’s Australian Signals Directorate, and the Australian Federal Police and National Cyber Security Centre, released an updated joint Cybersecurity Advisory on Scattered Spider—a cybercriminal group targeting commercial facilities sectors and subsectors. This advisory provides updated tactics, techniques, and procedures (TTPs) obtained through FBI investigations conducted through June 2025. Scattered Spider threat actors have been…

Read More

CISA, in partnership with the Federal Bureau of Investigation (FBI), the Department of Health and Human Services, and the Multi-State Information Sharing and Analysis Center issued a joint Cybersecurity Advisory to help protect businesses and critical infrastructure organizations in North America and Europe against Interlock ransomware.   This advisory highlights known Interlock ransomware indicators of compromise and tactics, techniques, and procedures identified through recent FBI investigations.   Actions organizations can take today to mitigate Interlock ransomware threat…

Read More

CISA has added one new vulnerability to its Known Exploited Vulnerabilities Catalog, based on evidence of active exploitation. See CISA’s Alert Microsoft Releases Guidance on Exploitation of SharePoint Vulnerability (CVE-2025-53770) for more information and to apply the recommended mitigations.  CVE-2025-53770: Microsoft SharePoint Server Remote Code Execution Vulnerability These types of vulnerabilities are frequent attack vectors for malicious cyber actors and pose significant risks to the federal enterprise. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk…

Read More