LONDON, Aug. 19 (UPI) -- The Welchi or Nachi worm is using the same trick as last week's MSBlast virus to travel around the Net -- but this time to fix vulnerable computers.
The Nachi worm tries to automatically apply the software patch issued by Microsoft to secure machines against the attentions of MSBlast.
If the Nachi virus finds the MSBlast worm on a PC, it removes the malicious program, the BBC reported.
"The writer of the Nachi worm may want to be seen as the 'Dirty Harry' of the internet world, cleaning up malicious MSBlast code wherever it is found," said Graham Cluley, senior technology consultant at anti-virus firm Sophos.
Last week, many using Windows PCs fell victim to the MSBlast worm which exploited a month-old security loophole to infect machines.
