Summary
Variants in the Virut family (also known as Virtob) are polymorphic, memory-resident, appending file infectors that have Entry Point Obscuring (EPO) capabilities.
Removal
Based on the settings of your F-Secure security product, it will either move the file to the quarantine where it cannot spread or cause harm, or remove it.
A False Positive is when a file is incorrectly detected as harmful, usually because its code or behavior resembles known harmful programs. A False Positive will usually be fixed in a subsequent database update without any action needed on your part. If you wish, you may also:
- Check for the latest database updatesFirst, check if your F-Secure security program is using the latest updates, then try scanning the file again.
- Submit a sampleAfter checking, if you still believe the file is incorrectly detected, you can submit a sample of it for re-analysis.Note: If the file was moved to quarantine, you need to collect the file from quarantine before you can submit it.
- Exclude a file from further scanningIf you are certain that the file is safe and want to continue using it, you can exclude it from further scanning by the F-Secure security product.Note: You need administrative rights to change the settings.
Technical Details
- O noon of life! O time to celebrate!
- O summer garden!
- Relentlessly happy and expectant, standing: -
- Watching all day and night, for friends I wait:
- Where are you, friends? Come! It is time! It's late!
Entry Point Obscuring
- Method 1: The virus relocates a certain amount of bytes from the entry point of the original file and writes its initial decryptor there. So when an infected file is run, the virus code gets control first. The initial decryptor then decrypts a small part of the virus's body that is appended to the end of the infected file and passes control to it.
- Method 2: The virus appends its code to the end of the file and changes the entry point address of the original program so it points to the start of the appended viral code, where the decryptor is located. This is the most common way of infecting files for appending parasitic infectors.
- Method 3: The virus writes its initial code into a gap (empty space) in the end of the original file's code section and redirects the entry point address to that code. The initial code decrypts a small part of the virus body and passes control to it. Then the main decryptor takes control and decrypts the rest of the virus body. Once the file is infected, the virus patches the first found API call (from the entry point address) in the original program so that instead of the API, it calls the initial virus decryptor. That decryptor may be located in the end of the code section as said above.
Activity
- Relocates the original file's data back to its place and passes control to it
- Returns control to the original file's entry point address
- Calls the replaced API itself and then passes control to the original program.
Backdoor
Protect your devices from malware with F‑Secure Total
Protecting your devices from malicious software is essential for maintaining online security. F‑Secure Total makes this easy, helping you to secure your devices in a brilliantly simple way.
- Award‑winning antivirus and malware protection
- Online browsing, banking, and shopping protection
- 24/7 online identity and data breach monitoring
- Unlimited VPN service to safeguard your privacy
- Password manager with private data protection
Choose how many devices you want to protect to get started.
- Free customer support
- Cancel anytime
- The trial does not obligate you to buy the product
After 30 days your subscription will renew automatically for one year at €69.99.
)
)
More Support
Community
Ask questions in our Community.
User guides
Check the user guide for instructions.
Contact Support
Chat with with or call an agent.
Submit a Sample
Submit a file or URL for analysis.