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.
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:
Please restart a computer after disinfection.
The self-extracting file is a PE executable, about 76K long. When run, it will create the Worm's folder:
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
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