The Federal Bureau of Investigation (FBI) and the Cybersecurity and Infrastructure Security Agency (CISA) have issued a joint security alert warning organizations about a recent surge in Ghost ransomware activity, also known as Cring. The Chinese-linked ransomware group has been exploiting long-standing vulnerabilities in software and firmware, with attacks continuing as recently as January 2025.
The alert, released in collaboration with the Multi-State Information Sharing and Analysis Center (MS-ISAC), highlights how Ghost ransomware operators target internet-facing systems with unpatched security flaws—many of which should have been mitigated years ago. The FBI and CISA urge organizations to immediately review their security posture, as the group has already compromised networks across over 70 countries, including within China itself.
Ghost Ransomware’s Tactics: Exploiting Years-Old Security Flaws
The Ghost/Cring ransomware group, first identified in 2021, continues to exploit known vulnerabilities in widely used enterprise software, security appliances, and email servers. The alert lists the following as top targets:
- Fortinet Security Appliances – The group exploits unpatched vulnerabilities in Fortinet devices, often using outdated firmware as an entry point.
- Adobe ColdFusion Servers – Attacks on ColdFusion web applications have allowed Ghost actors to gain initial access to corporate networks.
- Microsoft Exchange Servers – The ProxyShell attack chain, a set of vulnerabilities first disclosed in 2021, continues to be used to breach unpatched Exchange servers, allowing lateral movement within networks.
Despite the availability of security patches for these vulnerabilities, many organizations have failed to apply them, leaving critical infrastructure, businesses, and institutions vulnerable to attack.
Widespread Impact: Who Is at Risk?
Since its emergence, the Ghost ransomware group has targeted a wide range of industries, including:
- Critical Infrastructure (power grids, water utilities, transportation systems)
- Educational Institutions (schools, universities, and research facilities)
- Healthcare (hospitals, medical centers, and health insurance providers)
- Government Networks (local, state, and federal agencies)
- Religious Institutions
- Technology and Manufacturing Companies
- Small and Medium-Sized Businesses (SMBs)
The primary motivation behind these attacks remains financial extortion, with ransom demands sometimes reaching hundreds of thousands of dollars. However, ransomware payments do not guarantee data recovery, and organizations that comply with demands often remain at risk for repeat attacks.
Rapid Attack Deployment: Ghost’s Speedy Infiltration
Unlike some ransomware groups that spend weeks or months infiltrating networks, Ghost/Cring actors move quickly.
“Persistence is not a major focus for Ghost actors, as they typically only spend a few days on victim networks,” the FBI and CISA state.
“In multiple instances, they have been observed proceeding from initial compromise to the deployment of ransomware within the same day.”
This rapid attack timeline increases the risk of immediate data encryption and operational disruption, leaving little time for organizations to detect and respond before critical systems are locked.
Common Tools and Ransomware Variants
Ghost ransomware operators rely on off-the-shelf hacking tools to gain access, escalate privileges, and deploy ransomware payloads. Common tools observed in these attacks include:
- Cobalt Strike – A widely used penetration testing framework often abused by threat actors to establish remote access.
- Mimikatz – A tool used for credential harvesting, enabling attackers to gain higher-level privileges.
- Ransomware Variants – Ghost ransomware variants have been identified under multiple filenames, including:
- Cring.exe
- Ghost.exe
- ElysiumO.exe
- Locker.exe
Once ransomware is deployed, victims are presented with ransom demands, often requiring payment in cryptocurrency, such as Bitcoin or Monero, in exchange for a decryption key.
How Ghost Ransomware Groups Choose Their Targets
The impact of Ghost ransomware varies widely from victim to victim, according to the FBI and CISA. However, Ghost actors tend to move to other targets when confronted with hardened security defenses.
Key security measures that deter attacks include:
Network Segmentation – Prevents lateral movement between systems.
Up-to-Date Security Patches – Eliminates vulnerabilities before they can be exploited.
Strong Access Controls – Limits administrative privileges to only necessary personnel.
Endpoint Detection and Response (EDR) Solutions – Provides real-time monitoring and rapid response to ransomware activity.
“Ghost actors tend to move to other targets when confronted with hardened systems,” the agencies note, reinforcing the importance of proactive cybersecurity defenses.
Mitigation and Defensive Measures
The FBI, CISA, and MS-ISAC recommend immediate actions for organizations to defend against Ghost ransomware attacks:
Patch Vulnerabilities Immediately – Ensure Fortinet, Adobe ColdFusion, and Microsoft Exchange servers are fully patched and up to date.
Segment Networks – Limit unnecessary connections between internal systems to prevent ransomware from spreading.
Disable Unused Services – Reduce the attack surface by disabling unused software, protocols, and ports.
Implement Strong Authentication – Require multi-factor authentication (MFA) for all privileged accounts.
Monitor for Suspicious Activity – Deploy endpoint security tools and intrusion detection systems to spot malicious activity early.
Regularly Back Up Data – Store backups offline and separate from the main network to prevent ransomware encryption.
Organizations are urged to report any suspected Ghost ransomware activity to the FBI or CISA to assist in tracking and mitigating further attacks.
Conclusion: A Persistent and Evolving Threat
The Ghost/Cring ransomware group remains an active and dangerous cyber threat, targeting unpatched systems with known vulnerabilities. Despite widespread awareness of Fortinet, ColdFusion, and Microsoft Exchange exploits, many organizations fail to implement critical security patches, leaving them vulnerable to fast-moving, financially motivated ransomware attacks.
As Ghost ransomware actors continue refining their tactics, proactive cybersecurity measures—including network segmentation, software updates, and endpoint monitoring—are the best defense against future incidents.
The FBI and CISA’s alert serves as a critical reminder: if your organization relies on outdated or unpatched systems, it’s only a matter of time before it becomes the next target.
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