Recovery of files affected by ELF Ransomware

Preventing a ELF ransomware attack requires a comprehensive cybersecurity framework, but that’s not all, let’s list some important points that you need to pay attention to.

• Organisation – Having documentation of the IT park helps a lot in the prevention process, in addition to the inventory of networks and computers. Develop rules so that new employees have clear company policy on the installation and use of programmes on computers.
• Strong Passwords – Passwords should be strong, containing more than 8 digits, including special ones. And do not use a single password for multiple credentials.
• Security Solutions – Have a good antivirus installed, keep all programmes up to date, especially the operating system. Besides the antivirus solution, you need a Firewall and endpoints. They will make sure that the system stays protected.
• Beware of suspicious emails – One of the most used means for invasion used by hacker groups are spam email campaigns, so it is vital to create a security and awareness policy for employees not to download attached files sent by unknown emails.
• Efficient backup policies – Backups are essential for any eventual incident, but even with this essential role many companies neglect it or create a backup schedule that is not effective. We have already assisted several clients that not only the data was encrypted, but also the backups. It is not recommended to keep online backups only. The best backup structure is 3x2x1, which is 3 backups, 2 online and 1 offline, in addition to creating a consistent routine of updating the backups.
• Beware of unofficial programmes – There are numerous paid programmes that are made available for free on the Internet, such as Windows, Office and many others. They may appear to be free at first, but in the future can be used as a gateway for future hacker attacks. Even if official programmes demand financial resources, they are a good investment and are also secure.

There are several strategies employed by criminals, the main ones are: downloads of infected files, malicious links, attacks via RDP, Phishing, spam email campaigns, and more.

All of them have the same intention, to access the victim’s system without the victim’s awareness. To do so, the ELF ransomware camouflages itself in the system so as not to be detected by defence systems.

In the tactics that depend on the action of a user, phishing tactics are applied so that the victim, without realising it, downloads the ELF ransomware into the system.

Yes, there are several behaviours of your server that you can analyse to determine if you are being attacked by ELF ransomware:

1. High resource usage: If your server’s processing, memory, and disk usage are significantly higher than usual, it could indicate that ransomware is actively encrypting files or exfiltrating data.
2. Changes in file extensions: ELF Ransomware often renames files with a new extension, such as .encrypted or .locked. If you notice such changes, it may be a sign that your server has been attacked.
3. Unusual network traffic: ELF Ransomware needs to communicate with its command and control (C&C) server to receive instructions and report back on its progress. Analysing network traffic for unusual connections or data transfers can help you identify potential ransomware activity.
4. Suspicious login attempts: ELF Ransomware attackers often gain access to a server through phishing emails or brute force attacks on weak passwords. Monitoring your server’s login attempts and blocking suspicious activity can help prevent ransomware attacks.
5. Unusual system modifications: ELF Ransomware may make modifications to your server’s operating system or file system to carry out its attack. Keep an eye out for any changes to system files, registry entries, or other critical components.

By analysing these behaviours, you can potentially detect and prevent a ELF ransomware attack on your server. It’s important to stay vigilant and implement security measures to protect against ransomware and other cyber threats.

If you are the victim of a ELF ransomware attack and you do not pay the ransom demanded by the hackers, several things could happen:

1. Your data remains encrypted: If your files are encrypted by the ELF ransomware, they will remain inaccessible until the encryption is removed. Without the decryption key provided by the attackers, you may be unable to access your data.
2. The attackers may delete your files: Some ELF ransomware attackers may threaten to delete your files if you do not pay the ransom within a certain timeframe. If you refuse to pay and the attackers follow through on their threat, you may lose all of your data.
3. The attackers may leak your data: In some cases, the attackers may use a double-extortion tactic, in which they not only encrypt your files but also steal them and threaten to release them publicly if you do not pay the ransom. If you refuse to pay and the attackers follow through on their threat, your data may be released to the public or sold on the dark web.

Paying the ransom is not recommended, as it incentivizes attackers to continue their criminal activities and there is no guarantee that they will provide you with the decryption key or honor their promises. Instead, it’s important to take steps to prevent ELF ransomware attacks, such as implementing strong cybersecurity measures, regularly backing up your data, and educating yourself and your employees about potential attack vectors.