Waledac bot pitches nearby terrorist bombing to dupe users

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Hackers customise bait to recipient's location, says researcher

By Gregg Keizer | Framingham | Wednesday, 18 March, 2009

Hackers trying to trick users into downloading the Waledac Trojan are customising their bait to the recipient's location, says a security researcher, upping the social engineering ante yet again.

The latest round of spam messages from Waledac's makers trumpets news of a supposed bomb blast, said Paul Royal, principal researcher for web security company Purewire. The link included in the spam — which comes armed with subject headings such as "Bomb was blasted in your town" and "At least 18 killed in your city" — leads to a fake Reuters news service site, and a story that claims local fatalities from a bombing attack.

"Authorities suggested that the explosion was caused by a 'dirty' bomb," one version of the bogus site read. The site then uses the now-standard ruse of asking the user to download and install an update to Adobe System's Flash Player to view video. The file is, of course, nothing of the sort, but is actually the Waledac Trojan horse.

"Within the last 24 to 48 hours, Waledac has switched to a fake Reuters news story," said Royal. In itself, that's nothing new: Attackers have leveraged current events to get users to download malware for years. "What's somewhat novel here is that the Waledac operators have added the notion of locality," he said.

"Either at the malware distribution point, or somewhere upstream from the user, they look at the IP address, use that to get your location, and then feed that into the news story so it says that the bomb blast was near a market in your city."

When Royal used an IP address in Chile, for example, he was served up with a link to a story that claimed the bombing had taken place in Santiago, that country's largest city and capital. "The content becomes more compelling," Royal said, when it poses as local news.

Waledac has become famous for using the cutting-edge social engineering tactics, one of the reasons why security researchers almost unanimously believe that its makers are from the group that operated the infamous Storm botnet last year.

"Storm's operators always chose to exploit things that were temporally relevant," said Royal. "And Waledac shows the same unique insight into using social engineering and what's current in the news."

Although Waledac has been active for several months, Royal noted that it has yet to build up a botnet that can rival Storm at its peak. "It's nowhere near as big," he said, noting that Purewire had pegged Storm as controlling as many as 400,000 PCs in late 2007. "It's harder to get an accurate number for Waledac," he admitted, "but our best guess is that it's in the 25,000 to 50,000 range."