Initially MyLife.a became prevalent in March, according to Andrew Gordon, managed services architect with anti-virus software vendor Trend Micro.
This was followed by MyLife.b in late March with another four variants being reported over Easter.
The concern with the latest MyLife.f variant is that it isn't corrupted unlike, for example, MyLife.d -- the payload of which didn't operate properly because the variant was corrupted.
Gordon said that the MyLife.c (which has the attachment list.TXT.scr) and MyLife.f (with the list480.TXT.scr attachment) variants were the most problematic in Australia.
He described the MyLife.f variant as a very destructive worm. -The payload would try and delete all files in the c drive, then try to format drive from d through to I if they exist," Gordon said.
Currently the variant has a low-risk rating from the vendor, with anti-virus companies having issued fixes last week.
Gordon said Australia and New Zealand were the among the first countries hit by the MyLife.f variant.
According to reports all four new variants of MyLife have the same mass mailing characteristics as the original. They e-mail themselves to addresses in the Microsoft Outlook address book and the MSN Messenger contact list.
