Summary
Kelvir.f is a worm that uses MSN Messenger to send out a link. The link points to a site that contains self-extracting file which will install Kelvir.f and a new Sdbot variant.
Removal
To get rid of this worm it is enough to delete its files from the infected hard disk. The latest versions of F-Secure Anti-Virus can automatically disable (rename) the worm's infected files. If automatic disinfection fails, please select 'Delete' disinfection action for the worm's files when it is detected. Instructions are here:
https://support.f-secure.com/enu/home/virusproblem/howtoclean/howtodeleteinfec...
Please restart a computer after disinfection.
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 updates
First, check if your F-Secure security program is using the latest updates, then try scanning the file again.
Submit a sample
After 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 scanning
If 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
The self-extracting file is a PE executable, about 76K long. When run, it will create the Worm's folder:
C:\Program Files\RWNT3\
and place two files in there:
Fart.exe -- 19337 bytes long
rwnt3.exe -- 6778 bytes long
It will also drop copy of the Sdbot into %SYSTEM% directory. Then the worm will alter registry entries to ensure that the Sdbot is activated upon reboot. There is no entry that activates Kelvir.h after the system is restarted.
HKCU\Software\Microsoft\Windows\CurrentVersion\Run\ "Microsoft MSN Services" = "MSts32.exe" HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\Run\ "Microsoft MSN Services" = "MSts32.exe" HKLM\SOFTWARE\Microsoft\Windows\CurrentVersion\RunServices\ "Microsoft MSN Services" = "MSts32.exe"
FSAV detects the dropper as component: Backdoor.Win32.SdBot.gen
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.