What is wiper malware?

Understanding the wiper malware: One of the most destructive cyber threats

Destructive malware, such as wiper malware, is a type of malicious software that deletes, overwrites or encrypts files in a way that makes them unrecoverable. Unlike ransomware, which typically aims to extort money, wiper attacks are designed to cause irreversible damage. In most cases, there is no ransom demand, and victims cannot restore their data.

In this article, you will learn what wiper malware is, how it works, the most common motivations behind these attacks and how to protect your organisation from such threats. A real-world case is also included for context.

Introduction to cyber threats

Cyber threats encompass a wide range of malicious activities aimed at compromising the security and integrity of computer systems, networks, and data. Among these threats, wiper malware stands out as one of the most destructive. Designed to destroy or corrupt data on targeted systems, wiper malware can lead to permanent data loss, disrupt business operations, and compromise critical infrastructure. Understanding the nature of cyber threats, including wiper malware, is crucial for developing effective cybersecurity strategies. Continuous monitoring, threat intelligence, and incident response are vital components of a robust cybersecurity strategy. By staying informed about the latest cyber threats, organizations can take proactive measures to protect their critical data and prevent successful wiper attacks.

The purpose of wiper malware

The main goal of wiper malware is to permanently delete data. This includes files, operating systems or even entire networks. Because the damage is often beyond repair, attackers do not expect financial gain. Instead, the attack is used to cause disruption, hide evidence or support political or military objectives.

History and evolution

The history of wiper malware dates back to the early 2000s, with one of the most notable early examples being the Shamoon attack on Saudi Aramco in 2012. This attack marked a significant escalation in the use of wiper malware, demonstrating its potential to cause widespread damage. Since then, wiper malware has evolved to become more sophisticated and destructive. The use of wiper malware has increased significantly in recent years, particularly in the context of cyber warfare. Modern wiper malware employs advanced techniques such as overwriting files, encrypting files, and corrupting the master boot record (MBR) or master file table (MFT). Understanding the history and evolution of wiper malware is essential for developing effective cybersecurity measures to prevent and respond to wiper attacks.

Common motivations behind wiper malware attacks

Economic deception

Although financial gain is not the typical purpose, attackers may try to mimic a ransomware attack. Victims might be tricked into paying a ransom, even though their data cannot be recovered. Unlike ransomware, wiper malware does not provide a decryption key, leading to permanent data loss. This is known as a ransomware scam.

To understand how real ransomware attacks work and how to defend against them, explore our guide on ransomware.

Hiding evidence

Wiper malware is sometimes used to remove traces of a previous cyberattack. For example, if sensitive data has been stolen, the attacker may deploy wiper malware to erase system logs and evidence, making it harder for investigators to identify what happened.

Sabotage

Sabotage is a direct and frequent goal of wiper malware. These attacks can halt software development, damage IT systems or cause severe financial losses. The goal is to create confusion and disrupt operations by targeting critical assets.

Cyberwarfare

Wiper malware is increasingly used as a weapon in cyber conflicts. In the ongoing conflict between Russia and Ukraine, Ukrainian authorities and infrastructure have been frequent targets. These attacks are used to weaken essential systems and support military objectives. Notable wiper attacks such as Shamoon and NotPetya illustrate the destructive potential of these threats and highlight the necessity for robust cybersecurity measures.

How wiper malware works

Wiper attacks often rely on one or more of the following destructive methods. Some wiper malware uses direct access to hard drives to bypass operating system protections, employing third-party tools to overwrite data at a lower level than typical operating system interactions.

Logical deletion vs physical destruction

Logical deletion happens when files are removed from the system in a regular way, such as sending them to the recycle bin and emptying it. While the file reference is deleted, the data still exists on the disk and can sometimes be recovered using special tools.

Physical destruction, on the other hand, means the malware overwrites the actual data storage locations. This makes recovery virtually impossible. Most wiper malware uses physical deletion methods to ensure complete data loss. Some wiper malware, like HermeticWiper, overwrites targeted disk sections with random data to enhance the effectiveness of its data destruction.

Key technical targets in wiper attacks

Master Boot Record (MBR)

The MBR is essential for the operating system to start. If it is corrupted, the computer cannot boot. Replacing or deleting the MBR renders the system unusable.

Master File Table (MFT)

The MFT contains metadata and physical locations of files on NTFS file systems. If the MFT is destroyed, the operating system cannot locate all the files, especially those stored in fragmented form.

Attackers often use a combination of these methods to ensure that the data is not only inaccessible but also irrecoverable.

Impact on business continuity

Wiper malware can have a devastating impact on business continuity, causing permanent data loss, disrupting operations, and compromising critical infrastructure. A successful wiper attack can lead to significant financial loss, reputational damage, and legal repercussions. Wiper malware can destroy critical files, corrupt the operating system, and render computer systems unusable. The impact of a wiper attack can be so severe that some organizations may never fully recover from the loss of critical data. Implementing proper network segmentation, maintaining regular backups, and adopting robust cybersecurity measures can help mitigate the impact of a wiper attack. Employee training, incident response, and continuous monitoring are also essential for preventing and responding to wiper attacks.

Explore how awareness training and phishing simulations from Moxso can strengthen your organization’s defenses against wiper malware and other cyber threats.

Industries most vulnerable

Certain industries are particularly vulnerable to wiper malware attacks, including financial companies, oil companies, and government agencies. These industries often possess sensitive information and critical infrastructure, making them high-value targets for threat actors. Wiper malware can be used to disrupt operations, compromise sensitive information, and cause financial loss. For example, the Bahrain National Oil Company was targeted by a wiper malware attack in 2012, causing significant disruption. Ukrainian organizations have also been frequent targets of wiper malware attacks, including the notorious NotPetya attack in 2017. Understanding the industries most vulnerable to wiper malware attacks is essential for developing targeted cybersecurity measures to prevent and respond to these threats. By implementing best practices such as regular backups, software security, and patch management, organizations can reduce their risk of being targeted by wiper malware attacks.

How to protect against wiper malware

Organisations can reduce the risk and damage of wiper malware by following these security best practices. Emphasizing improved security protocols is crucial to protect against wiper malware attacks, ensuring data integrity and preventing data loss.

Implement secure backups

Maintain regular backups and store them offline or offsite. Many wiper attacks target backup systems, so separation is critical for protection. Isolating affected systems is essential to protect backups, mitigate damage, and ensure business continuity.

Develop a recovery plan

Create and test a disaster recovery plan that includes roles, responsibilities and a step-by-step guide for restoring systems after an attack. Ensure your plan includes strategies to recover data, as ransomware scams often mislead victims into thinking their data can be restored upon payment, while some malware actively destroys recovery options. Fast and effective response is crucial to minimise damage.

Conclusion

Wiper malware is a serious threat that can cause lasting damage to organisations, governments and critical infrastructure. Unlike other types of malware, it does not seek profit but instead aims to destroy, disrupt or deceive.

Wiper threats pose a significant and growing risk within the cybersecurity landscape, causing permanent data loss and operational disruptions. To defend against these threats, organisations must invest in secure backups, build effective recovery strategies and stay informed about the evolving cyber threat landscape.