Cervivec is an Internet worm virus spreading via the Internet as an email attachment.
The worm itself is a Windows PE EXE file about 230Kb in size, written in Delphi. It is compressed by UPX – the decompressed size is about 670Kb.
The infected messages have Subject/Body content randomly selected from different variants in different languages:
The worm activates from infected email only if a user clicks on the attached file. The worm then installs itself into the system, runs its spreading and ‘effect’ routines (colored “worms” eating the desktop).
While installing itself the worm copies itself to the Windows directory and to the SYSTEM32 subdirectory with the name “ntkrnl.exe”. It then registers that file in the system registry auto-run key: