Trojan-Downloader:W32/Cerber

Threat description

Details

CATEGORYMalware
TYPETrojan

Summary

Cerber variants are ransomware that encrypt the device or data stored on it, then demand a payment from the user to restore normal access to the affected content or device.



Removal

Automatic action

Based on the settings of your F-Secure security product, it will either automatically delete, quarantine or rename the file or application.

Further action

If ransomware uses encryption to take files or an entire system hostage, the encryption may be sufficient to make it very difficult to decrypt the files without the necessary decryption key.

In such circumstances, the recommended course of action is to report the crime to the relevant authorities and restore the affected data from a backup.

Technical Details

Users may encounter Cerber ransomware in a number of ways:

  • When browsing a legitimate website that has been compromised to host harmful files
  • When redirected by another threat to a malicious or fake website that hosts the harmful files
  • When silently dropped on the user's machine by an exploit kit or botnet
  • As a file attached to a spam or targeted email

Cerber ransomware will often use social engineering. This usually involves making the file, spam email or fake website look legitimate or desirable enough to lure the user into voluntarily running the file.

Once launched, the ransomware will silently encrypt files on a computer, essentially 'scrambling' the contents of the file so that the user can't access it normally without a decryption key that can correctly 'unscramble' it. This type of ransomware is known as crypto-ransomware.

Consequences

Depending on the type of ransomware involved, the user may be able to take further actions. In most cases however, the encryption used to hold the content or computer hostage is extremely difficult to break, making recovery impossible unless a) a clean, recent backup is available, or b) the decryption key is obtained.

In such circumstances, the recommended course of action is to report the crime to the relevant authorities and restore the affected data from a backup. Precautionary measures should also be taken to protect your content and machine from being vulnerable to ransomware in the future. For more information, see:

Submit a Sample

Suspect a file or URL was wrongly detected?
Send it to our Labs for further analysis

Submit a Sample

Scan & clean your PC

F-Secure Online Scanner will scan and clean your PC in just a few minutes for free

More Info