Category Archives: Web Fraud 2.0

‘Booter Shells’ Turn Web Sites into Weapons

August 10, 2012
102 Comments

Hacked Web sites aren’t just used for hosting malware anymore. Increasingly, they are being retrofitted with tools that let miscreants harness the compromised site’s raw server power for attacks aimed at knocking other sites offline.

It has long been standard practice for Web site hackers to leave behind a Web-based “shell,” a tiny “backdoor” program that lets them add, delete and run files on compromised server. But in a growing number of Web site break-ins, the trespassers also are leaving behind simple tools called “booter shells,” which allow the miscreants to launch future denial-of-service attacks without the need for vast networks of infected zombie computers.

Triple DDoS vs. KrebsOnSecurity

August 8, 2012
28 Comments

During the last week of July, a series of steadily escalating cyber attacks directed at my Web site and hosting provider prevented many readers from being able to reach the site or read the content via RSS. Sorry about that. What follows is a post-mortem on those digital sieges, which featured a mix of new and old-but-effective attack methods.

Cyberheist Smokescreen: Email, Phone, SMS Floods

July 18, 2012
35 Comments

It was early October 2011, and I was on the treadmill checking email when I noticed several hundred new messages had arrived since I last looked at my Gmail inbox just 20 minutes earlier. I didn’t know it at the time, but my account was being used to beta test a private service now offered openly in the criminal underground that can be hired to create highly disruptive floods of junk email, text messages and phone calls.

Many businesses request some kind of confirmation from their bank whenever high-dollar transfers are initiated. These confirmations may be sent via text message or email, or the business may ask their bank to call them to verify requested transfers. The attack that hit my inbox was part of an offering that crooks can hire to flood each medium of communication, thereby preventing a targeted business from ever receiving or finding alerts from their bank.

Feds Arrest ‘Kurupt’ Carding Kingpin?

June 12, 2012
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The Justice Department on Monday trumpeted the arrest of a Dutch man wanted for coordinating the theft of roughly 44,000 credit card numbers. The government hasn’t released many details about the accused, but data from a variety of sources indicates he may have run a large, recently-shuttered forum dedicated to cyber fraud, and that he actively hacked into and absconded with stolen card data taken from other fraud forums.

This much the government is saying: David Benjamin Schrooten, 21, appeared in Seattle federal court on Monday and pleaded not guilty to charges of bank fraud, access device fraud and conspiracy. Schrooten was accused of running Web sites that sold stolen credit card numbers in bulk. Authorities said Schrooten was extradited to the United States after being arrested in Romania, and that another man — 21-year-old Christopher A. Schroebel of Maryland — was an accomplice and also was charged.

OpenX Promises Fix for Rogue Ads Bug

May 2, 2012
10 Comments

Hackers are actively exploiting a dangerous security vulnerability in OpenX — an online ad-serving solution for Web sites — to run booby-trapped ads that serve malware and browser exploits across countless Web sites that depend on the solution.

Security experts have been warning for months about mysterious attacks on OpenX installations in which the site owners discovered new rogue administrator accounts. That access allows miscreants to load tainted ads on sites that rely on the software. The bad ads usually try to foist malware on visitors, or frighten them into paying for bogus security software.

OpenX is only now just starting to acknowledge the attacks, as more users are coming forward with unanswered questions about the mysteriously added accounts.

Service Automates Boobytrapping of Hacked Sites

May 1, 2012
8 Comments

Hardly a week goes by without news of some widespread compromise in which thousands of Web sites that share a common vulnerability are hacked and seeded with malware. Media coverage of these mass hacks usually centers on the security flaw the allowed the intrusions, but one aspect of these crimes that’s seldom examined is the method by which attackers automate the booby-trapping and maintenance of their hijacked sites.

Regular readers of this blog may be unsurprised to learn that this is another aspect of the cybercriminal economy that can be outsourced to third-party services. Often known as “iFramers,” such services can simplify the task of managing large numbers of hacked sites that are used to drive traffic to a handful of sites that serve up malware and browser exploits.

Researchers Clobber Khelios Spam Botnet

March 28, 2012
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Experts from across the security industry collaborated this week to quarantine more than 110,000 Microsoft Windows PCs that were infected with the Khelios worm, a contagion that forces infected PCs to blast out junk email advertising rogue Internet pharmacies.

Most botnets are relatively fragile: If security experts or law enforcement agencies seize the Internet servers used to control the zombie network, the crime machine eventually implodes. But Khelios (a.k.a. “Kelihos”) was built to withstand such attacks, employing a peer-to-peer structure not unlike that used by popular music and file-sharing sites to avoid takedown by the music and entertainment industry.