Conficker.c controls 4% of all infected PCs, IBM says

Vietnamese security company pegs the count at 1.3 million worldwide, 35,000 in the U.S.

As many as one out of every 25 Internet addresses that transmits potentially dangerous data over the Internet is infected with the Conficker.c worm, IBM Corp.'s security arm said Friday.

One day after the worm began communicating with its hacker controllers over a new command channel -- a trigger that failed to wreak the havoc some had predicted -- IBM Internet Security Systems' X-Force team had enough data to estimate its size, said Holly Stewart, the group's threat response manager.

Computerworld had asked Stewart for an estimate Tuesday, but she declined to provide one then. "We simply didn't want to report a number that would be inaccurate," Stewart said in a post to the X-Force blog.

Using techniques developed in-house, X-Force has been able to detect machines plagued with the newest variant of Conficker by picking apart incoming Internet traffic to find the worm's peer-to-peer communications. Earlier in the week, X-Force used that ability to pinpoint the geographic location of Conficker.c-infected PCs and found that most of them were in Asia and Europe, with relatively few in the U.S. and Canada.

Today, it released numbers that gave a glimpse into the possible size of the Conficker.c botnet. "Four percent of the sources of suspicious activity on the Internet are infected with Conficker.c," said Tom Cross, the manager of X-Force, in a telephone interview late today. X-Force arrived at that number by monitoring the traffic hitting its customers' intrusion prevention appliances.

It's impossible to correlate that percentage -- which essentially means that 1 out of every 25 infected PCs has been hit with Conficker -- to the general IP population, Cross cautioned. Clearly, the 4% isn't the fraction of the world's computers that are infected, he said. "There are people doing extrapolations using different methods who are coming up with estimates like that," he added.

One such estimate pegged the number of Conficker.c-infected systems rather precisely. According to Nguyen Tu Quang, chief technology officer at Bach Khoa Internetwork Security (BKIS), an antivirus vendor based in Hanoi, Vietnam, there are 1,384,100 computers harboring the worm.

China leads all countries in the count, Nguyen said in an e-mail today, noting that 13.7% of all Conficker.c infections are located there. Brazil and Russia follow in the No. 2 and No. 3 spots, with 10.4% and 9.3%, respectively. The U.S., meanwhile, accounts for just 2.6% of the total, or just over 35,000 PCs.

X-Force has detected a significant increase in the number of infected IP addresses since Monday, Stewart said in her blog. On Monday, for instance, it found 37,000 unique IP addresses with signs of Conficker.c infection, while by Wednesday the number had jumped to 64,000, an increase of 71%.

Cross, however, said that the climbing numbers didn't mean Conficker.c was spreading, but was only an artifact of the way it detected infections. "The way that we detect Conficker.c means that it takes time to find [infected systems]," he said.

Stewart echoed that in her blog. "Statistically, we will eventually see all infected IPs," she said.

In other Conficker news, the so-called Conficker Cabal, which goes by the more formal moniker of the Conficker Working Group, has published an online infection test that takes advantage of the worm's own blocking of antivirus sites. To run the test, click on this link to the group's Web site.

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Gregg Keizer

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