Ransomware is a type of malicious software, or malware, designed to deny access to a computer system or data until a ransom is paid. Ransomware typically spreads through phishing emails or by a victim unknowingly visiting an infected website.
CISA has observed continuing ransomware attacks across the country and around the world: See CISA's Awareness Briefings on Combating Ransomware, Joint Ransomware Statement, and CISA Insights – Ransomware Outbreak. Below, please find resources on CISA’s newly redesigned ransomware information page to better connect you with helpful resources and tools you and your organization need to guard against the ransomware threat.
Looking to learn more about this growing cyber threat? With industry best practices and individualized checklists, the NEW Ransomware Guide is a great place to start. The guide, released in September 2020, represents a joint effort between CISA and the Multi-State Information Sharing and Analysis Center (MS-ISAC). The joint Ransomware Guide is a customer-centered, one-stop resource with best practices and ways to prevent, protect and/or respond to a ransomware attack.
|Ransomware Guide||CISA Insights - Ransomware Outbreak|
In addition to reviewing the Ransomware Guide, we invite you to click on resources below to find additional Ransomware-related information. These resources are designed to help individuals and organizations prevent attacks that can severely impact business processes and leave organizations without the data they need to operate and deliver mission-critical services.
Alerts and Statements
Official CISA updates to help stakeholders guard against the ever-evolving ransomware threat environment. These alerts are geared toward system administrators and other technical staff to bolster their organization’s security posture.
Fact Sheets and Infographics
Easy-to-use, straightforward information to help organizations and individuals better understand the threats from and the consequences of a ransomware attack.
Trainings and Webinars
This information provides technical and non-technical audiences, including managers, business leaders, and technical specialists with an organizational perspective and strategic overview.
What is ransomware?
Ransomware is a form of malware designed to encrypt files on a device, rendering any files and the systems that rely on them unusable. Malicious actors then demand ransom in exchange for decryption. In recent years, ransomware incidents have become increasingly prevalent among the Nation’s state, local, tribal, and territorial (SLTT) government entities and critical infrastructure organizations.
Who is at risk from a ransomware attack?
Anyone with a computer connected to the internet and anyone with important data stored on their computer or network is at risk, including government or law enforcement agencies and healthcare systems or other critical infrastructure entities.
What are the impacts of ransomware?
Ransomware can be devastating to an individual or an organization. Some victims pay to recover their files, but there is no guarantee that they will recover their files if they do. Recovery can be a difficult process that may require the services of a reputable data recovery specialist.
Ransomware incidents can severely impact business processes and leave organizations without the data they need to operate and deliver mission-critical services. The monetary value of ransom demands has increased, with some demands exceeding $1 million. Ransomware incidents have become more destructive and impactful in nature and scope. The economic and reputational impacts of ransomware incidents, throughout the initial disruption and, at times, extended recovery, have also proven challenging for organizations large and small.
How do malicious cyber actors use ransomware to attack their victims?
Malicious actors have adjusted their ransomware tactics over time to include pressuring victims for payment by threatening to release stolen data if they refuse to pay, and publicly naming and shaming victims as secondary forms of extortion. Malicious actors engage in lateral movement to target critical data and propagate ransomware across entire networks. These actors also increasingly use tactics, such as deleting system backups, that make restoration and recovery more difficult or infeasible for impacted organizations.
Who are malicious ransomware actors?
Malicious actors can be nation-state actors trying to cause harm to critical infrastructure, or cybercriminals trying to enrich themselves.
What are some mitigations against ransomware?
CISA recommends the following precautions to protect users against the threat of ransomware:
- Update software and operating systems with the latest patches. Outdated applications and operating systems are the target of most attacks.
- Never click on links or open attachments in unsolicited emails.
- Back up data on a regular basis. Keep it on a separate device and store it offline.
- Follow safe practices when using devices that connect to the Internet. Read Good Security Habits for additional details.
What are other best practices against ransomware?
In addition, CISA also recommends that organizations employ the following best practices:
- Restrict users’ permissions to install and run software applications, and apply the principle of “least privilege” to all systems and services. Restricting these privileges may prevent malware from running or limit its capability to spread through a network.
- Use application allow listing to allow only approved programs to run on a network.
- Enable strong spam filters to prevent phishing emails from reaching the end users and authenticate inbound email to prevent email spoofing.
- Scan all incoming and outgoing emails to detect threats and filter executable files from reaching end users.
- Configure firewalls to block access to known malicious IP addresses.