Follow-Up: Anti-Santy Worm
I'd like to give you all a quick-update on the phpBB worm that targets the vulnerability used by Santy and patches it I reported yesterday. Although it still lacks a name, and little is actually known about it, the media is beginning to report on it. From ZDNet (underlining for emphasis on new details mine):
F-Secure said on Friday that it was aware of seven sites that had been defaced by the worm, which appears designed to combat the Santy worm. The anti-Santy worm searches Google for sites that use the PHP Bulletin Board (phpBB) software exploited by the earlier worm, infects the sites and attempts to make the sites more secure by installing a patch.
Mikko Hyppönen, director of antivirus research at F-Secure, said that although the worm may seem beneficial, in fact it is likely to cause problems for administrators who will have to handle the increase in traffic.
"I can't comment how effective it is in fixing the sites," said Hyppönen. "If a site is infected, the worm causes a huge amount of traffic and slows down the site. I don't think it's possible to write a beneficial worm."
Sites that have been attacked by the anti-Santy worm are defaced with the words: "viewtopic.php secured by Anti-Santy-Worm V4. Your site is a bit safer, but upgrade to >= 2.0.11."
Hyppönen said he has seen two versions of the defacement page, which lead to two different IP addresses. Both IP addresses resolve to Argentina, which suggest that that is where the anti-Santy worm originated.
The Santy worm wreaked havoc in the weeks before Christmas, spreading to more than 40,000 Web sites by Dec. 21. On Dec. 22, Google started blocking queries that were generated by the worm, to stop the worm from replicating. But a few days later it was discovered that it was using America Online and Yahoo's search engines and was still targeting Google.
It is hard to estimate how quickly Anti-Santy is spreading, as the message that the worm drops is much more hidden. However, if F-Secure is only aware of seven sites, this worm likely is a small-scale threat.
To Google's credit, it is doing a good job of protecting against this worm. I was surprised to find this on page two of my search when using a string to search for infected sites. They may want to adjust this before pranksters take the opportunity to fool unsuspecting non-techies into thinking Google is telling them for certain that they are infected.
More on this when and if it is available.