Summary The Cybersecurity and Infrastructure Security Agency (CISA) is releasing this advisory in response to ransomware actors leveraging unpatched instances of a vulnerability in SimpleHelp Remote Monitoring and Management (RMM) to compromise customers of a utility billing software provider. This incident reflects a broader pattern of ransomware actors targeting organizations...
Threat Actors Deploy LummaC2 Malware to Exfiltrate Sensitive Data from Organizations
Summary The Federal Bureau of Investigation (FBI) and the Cybersecurity and Infrastructure Security Agency (CISA) are releasing this joint advisory to disseminate known tactics, techniques, and procedures (TTPs) and indicators of compromise (IOCs) associated with threat actors deploying the LummaC2 information stealer (infostealer) malware. LummaC2 malware is able to infiltrate...
Russian GRU Targeting Western Logistics Entities and Technology Companies
Executive Summary This joint cybersecurity advisory (CSA) highlights a Russian state-sponsored cyber campaign targeting Western logistics entities and technology companies. This includes those involved in the coordination, transport, and delivery of foreign assistance to Ukraine. Since 2022, Western logistics entities and IT companies have faced an elevated risk of targeting...
Fast Flux: A National Security Threat
Executive summary Many networks have a gap in their defenses for detecting and blocking a malicious technique known as “fast flux.” This technique poses a significant threat to national security, enabling malicious cyber actors to consistently evade detection. Malicious cyber actors, including cybercriminals and nation-state actors, use fast flux to...
#StopRansomware: Medusa Ransomware
Summary Note: This joint Cybersecurity Advisory is part of an ongoing #StopRansomware effort to publish advisories for network defenders detailing various ransomware variants and ransomware threat actors. These #StopRansomware advisories include recently and historically observed tactics, techniques, and procedures (TTPs) and indicators of compromise (IOCs) to help organizations protect against...
#StopRansomware: Ghost (Cring) Ransomware
Summary Note: This joint Cybersecurity Advisory is part of an ongoing #StopRansomware effort to publish advisories for network defenders that detail various ransomware variants and ransomware threat actors. These #StopRansomware advisories include recently and historically observed tactics, techniques, and procedures (TTPs) and indicators of compromise (IOCs) to help organizations protect...
Threat Actors Chained Vulnerabilities in Ivanti Cloud Service Applications
Note: The CVEs in this advisory are unrelated to vulnerabilities (CVE-2025-0282 and CVE-2025-0283) in Ivanti’s Connect Secure, Policy Secure and ZTA Gateways. For more information on mitigating CVE -2025-0282 and CVE-2025-0283, see Ivanti Releases Security Updates for Connect Secure, Policy Secure, and ZTA Gateways. Summary The Cybersecurity and Infrastructure Security Agency...
Enhancing Cyber Resilience: Insights from CISA Red Team Assessment of a US Critical Infrastructure Sector Organization
EXECUTIVE SUMMARY The Cybersecurity and Infrastructure Security Agency (CISA) conducted a red team assessment (RTA) at the request of a critical infrastructure organization. During RTAs, CISA’s red team simulates real-world malicious cyber operations to assess an organization’s cybersecurity detection and response capabilities. In coordination with the assessed organization, CISA is...
2023 Top Routinely Exploited Vulnerabilities
Summary The following cybersecurity agencies coauthored this joint Cybersecurity Advisory (hereafter collectively referred to as the authoring agencies): United States: The Cybersecurity and Infrastructure Security Agency (CISA), the Federal Bureau of Investigation (FBI), and National Security Agency (NSA) Australia: Australian Signals Directorate’s Australian Cyber Security Centre (ACSC) Canada: Canadian Centre...
Iranian Cyber Actors’ Brute Force and Credential Access Activity Compromises Critical Infrastructure Organizations
Summary The Federal Bureau of Investigation (FBI), the Cybersecurity and Infrastructure Security Agency (CISA), the National Security Agency (NSA), the Communications Security Establishment Canada (CSE), the Australian Federal Police (AFP), and Australian Signals Directorate's Australian Cyber Security Centre (ASD's ACSC) are releasing this joint Cybersecurity Advisory to warn network defenders...