Viruses, it seems, are the latest class of thing to be "just like buses" -- nothing for ages and then three come at once. Last week the MSBlast worm assaulted many networks and wreaked havoc on a lot of PCs. This week, the Welchia worm -- which is actually supposed to remove MSBlast -- arrived and began causing additional problems. And now a new version of the old Sobig mass-mailing worm has begun infecting many systems with its own brand of mischief.
Windows patches may become automatic
As the MSBlast worm makes it clear that something must be done about insecure PCs, Microsoft has said this may be the time to take more control of the Windows update mechanism
Worm and virus overload networks
Corporate networks worldwide are struggling under the double burden of the "good" MSBlast variant and a new version of the malicious Sobig email virus
Sobig virus 'biggest epidemic yet'
Sobig represents the largest worldwide virus infection to date, judging by the volume of email blocked by Internet service providers
Sobig.F is 'worst variant yet'
The early evidence is that the Sobig.F virus is spreading across file-swapping networks as well as by email, putting both businesses and consumers at risk
Microsoft shuts down Update address
Microsoft says it has permanently killed the Windows Update Web site targeted by the MSBlast worm
Features and analysis
Networks must counter triple threat Three security threats have taken turns wreaking havoc in the past few weeks. How should MSBlast,Welchia and Sobig be handled?
Squashing the next worm
Another virus, another epidemic - but experts say it could have been worse
Code mishmash drives MSBlast
The MSBlast virus gains power from the piecemeal nature of its attack
Preventing and removing the Nachi worm
This worm tries to fix MSBlast infections but leaves open another serious vulnerability - find out how to protect yourself or deal with an infection
Sobig.F prevention and cure
A new variant of the Sobig virus, which caused chaos earlier this year, is spreading worldwide
Cleaning up after the MSBlast worm
How to rid your system of the latest fast-spreading worm
Protecting yourself from the MSBlast worm
What to do about a worm exploiting widely publicised holes in Microsoft Windows