Preventing Ransomware Attacks

Ransomware attackers have ways to avoid cybersecurity measures, but you can protect your business. Some of the tactics to reduce your risk of infection include backups, user training, quarantining suspicious emails, and content filtering.

Should you pay the ransom?

Cybersecurity researchers disagree as to whether you should pay. The FBI opposes paying the ransom. Some victims pay and gain access to their files; others pay and never receive a key. In the case of Petya, developers created the software with no method to decrypt data.

Overall, experts suggest cutting losses and not paying the ransom. Yet data loss can have a huge impact on your organisation, and the amount of ransom hackers demand is increasing. Petya developers originally asked for $300 in bitcoins. Newer ransomware versions ask for hundreds of thousands of dollars in cryptocurrency. The ransomware business model exists only because the malicious actors behind it continue to be paid. If payment was taken off the table, the ransomware business model would collapse.

Paying the ransom does not guarantee you will get the private key to restore your data. Instead, protect your files by using protective measures in your day-to-day operations. In case of an attack, you can return files to their original state. This is why backups are critical to recovery from an attack.

Protective measures

  • Backups
  • User training
  • Quarantining suspicious emails
  • Content filtering


     

Train users to detect ransomware

User training greatly reduces infection risk. A ransomware attack usually starts with a malicious email. Users can be trained to identify cyber threats including ransomware, phishing, and social engineering. Users trained to identify malicious messages are less likely to open an infected attachment.

Hackers sometimes use social engineering in their attacks. Social engineering is when an attacker targets specific users on the network who have higher privileges. The attackers bet that these users have more critical data on local storage or have access to business critical systems and infrastructure. This increases the chance that the business will pay the ransom.

Keep software patched and updated

Make sure firmware, anti-malware applications, operating systems, and third-party software have the latest patch installed. New ransomware versions come out regularly, and software updates ensure that your anti-malware recognizes newer threats.

WannaCry is an example of an operating system threat. It incorporated EternalBlue, an exploit developed by the United States National Security Agency (NSA). It leveraged a weakness in the Windows operating system Server Message Block (SMB) protocol. Microsoft published patches to stop WannaCry 30 days prior to the infections. Without the patches, Windows operating systems are vulnerable.

More recently we’ve seen ZeroLogon being used in ransomware attacks.

Always have backups

The best way to recover from ransomware is to restore data from a backup. Backups bypass the ransom demand by restoring data from a source other than the encrypted files. Hackers know this, so they develop ransomware that scans the network for backup files. After restoring from a backup, you still must remove the ransomware from the network.

An effective way to stop malware from encrypting backup files is to keep a copy of your backups offsite. Cloud backups are the typical choice for businesses that need an offsite backup solution. Using cloud backups, you keep a copy of your files safe from ransomware and other cybersecurity threats.

Detecting ransomware

A ransomware attack typically comes from an executable file or a script that downloads the executable file and runs it. Not every ransomware attack is immediate. Some ransomware stays dormant until a specific date. For instance, a type of ransomware named Locker, a CryptoLocker copycat, was silent until midnight May 25, 2015 when it executed its payload.

Screenshot of a CryptoLocker message

Network administrators detect ransomware with applications that monitor suspicious network traffic. The applications send notifications when malware renames a large number of files. Anti-malware software protects against thousands of types of ransomware. It contains digital signatures that identify ransomware before it can execute. It does not always catch zero-day attacks – those that target vulnerabilities developers don’t know about yet.

Current anti-malware solutions include artificial intelligence (AI), machine learning and behaviour monitoring. These solutions benchmark current file status against changes and file access requests. They alert administrators of suspicious activity so an attack can be resolved early and prevent file encryption and data destruction.

Early detection helps prevention

Effective ransomware prevention requires a combination of good monitoring applications, frequent file backups, anti-malware software, and user training. Although no cyber-defences reduce risk completely, you can greatly limit the chance attackers will be successful.

Ransomware Security Topics

Related Research

Related Articles