Spammers Target Dropbox Users

July 17, 2012
16 Comments

“Always have your stuff when you need it with Dropbox.” That’s the marketing line for the online file storage service, but today users have had difficulty logging into the service. The outages came amid reports that many European Dropbox users were being blasted with spam for online casinos, suggesting some kind of leak of Dropbox user email addresses.

The trouble began earlier today, when users on the Dropbox support forums began complaining of suddenly receiving spam at email addresses they’d created specifically for use with Dropbox. Various users in Germany, the Netherlands and United Kingdom reported receiving junk email touting online gambling sites.

Dropbox did not respond to emails seeking comment, but a forum user who self-identified as a company employee said Dropbox was investigating the reports.

At around 3 p.m. ET, the company’s service went down in a rare outage, blocking users from logging into and accessing their files and displaying an error message on dropbox.com. I will update this post in the event that the company responds to my requests or provides some explanation of what caused today’s outage and the spam.

The outage and strange spam runs follow a week of high profile password and data breaches. Yahoo! acknowledged that more than 400,000 user names and passwords to Yahoo and other companies were stolen last Wednesday. Formspring, a social question-and-answer site, reset all user passwords after it discovered that approximately 420,000 password hashes from its servers had been posted to an online forum last Monday. Androidforums.com and Billabong International also disclosed password breaches last week.

Continue reading →

How to Break Into Security, Bejtlich Edition

July 17, 2012
10 Comments

For this fourth installment of advice columns aimed at people who are interested in learning more about security as a craft or profession, I reached out to Richard Bejtlich, a prominent security blogger who last year moved from a job as director of incident response at General Electric to chief security officer at security forensics firm Mandiant.

Bejtlich responded with a practical how-to for a security novice looking to try on both attacker and defender hats. Without further ado…

Bejtlich: Providing advice on “getting started in digital security” is similar to providing advice on “getting started in medicine.” If you ask a neurosurgeon he or she may propose some sort of experiment with dead frog legs and batteries. If you ask a dermatologist you might get advice on protection from the sun whenever you go outside. Asking a “security person” will likewise result in many different responses, depending on the individual’s background and tastes.

Rather than try to devise a thorough curriculum that provides balanced coverage of the dozen or more distinct disciplines that one might call “digital security,” this article covers one aspect: magic. More specifically, this advice strives to dispel the notion that digital security is a realm where only magicians can perform superhuman feats involving computers and data. Rather, the point is to provide a way for beginners to get a feel for convincing a computer to take actions probably not expected by its original programmers. For those with a more technical inclination, the article provides a means to watch what is happening at the network level.

Continue reading →

Advertisement

Spy Software Aims to Corral Money Mules

July 16, 2012
26 Comments

Borrowing from the playbook of corporations seeking better ways to track employee productivity, some cybercriminal gangs are investing in technologies that help them keep closer tabs on their most prized assets: “Money mules,” individuals willingly or unwittingly recruited to help fraudsters launder stolen funds. It seems that at least one mule recruitment gang employs custom software to spy on new recruits.

Last month, I heard from a reader in North Carolina named John who’d been roped into working for a company that claimed to be in the digital concierge and outsourcing business. John became suspicious that he was involved in something shady when they told him he should expect a transfer of nearly $10,000 to the personal bank account that he’d provided to his erstwhile employer in order to eventually receive a paycheck.

The software stole this glimpse of my test machine’s desktop.

The firm that hired John, a fictitious company called VIP One, recruits mules to help process fraudulent transfers from businesses victimized by account takeovers. Prior to sending its mules money, VIP One has prospective mules spend several weeks doing relatively meaningless busy work, for which they are promised payment at the end of the month.

VIP One requires all new recruits to install a “time tracking” application, basically a digital stopwatch that employees are expected to use to keep track of their time “on the job.” John was kind enough to let me take a peek inside his account at VIP One, and to download the time tracking software. It’s safe to say that time is certainly not the only thing being tracked by this program.

I installed the application in a Window XP virtual machine equipped with Wireshark, a free program that lets you inspect the data packets going in and out of a host machine. I pressed start and left the software alone for a few hours. A review of the Wireshark logs showed that the time tracking tool periodically and surreptitiously took screenshots of my system, uploading them to a site called gyazo.com. This Web site appears to be associated with a legitimate screen-grabbing application that automates the grabbing and posting online of screen captures.

My test machine also had several peripherals plugged into it, including a Webcam. To my surprise, further review of the logs showed that the time tracking tool hijacked my machine’s Web cam and took several pictures, also posting them to gyazo.com.

Continue reading →

Banking on a Live CD

July 12, 2012
133 Comments

An investigative series I’ve been writing over the past three years about organized cyber crime gangs using malware to steal millions of dollars from small to mid-sized organizations has generated more than a few responses from business owners concerned about how best to protect themselves from this type of fraud.

I said this nearly three years ago, and it remains true: The simplest, most cost-effective answer I know of? Don’t use Microsoft Windows when accessing your bank account online. All of the malware used in the attacks I’ve written about is built for Windows. That’s not to say bad guys behind these online heists won’t get around to targeting Mac OS X, or users of other operating systems. Right now, there are no indications that they are doing this.

What the Puppy desktop looks like.

The quickest way to temporarily convert your Windows PC into a Linux system is to use a Live CD. This involves burning an downloadable image file to a CD, inserting the disc into your computer, and rebooting. If this sounds difficult, don’t worry, it’s not.

Here’s a step-by-step guide that should get you up and running in no time flat, with Puppy Linux, an extremely lightweight and fast version of Linux. If you’d prefer to try another distribution, there are dozens to choose from.

Continue reading →

EU to Banks: Assume All PCs Are Infected

July 12, 2012
26 Comments

An agency of the European Union created to improve network and data security is offering some blunt, timely and refreshing advice for financial institutions as they try to secure the online banking channel: “Assume all PCs are infected.”

Source: zeustracker.abuse.ch

The unusually frank perspective comes from the European Network and Information Security Agency, in response to a recent “High Roller” report (PDF) by McAfee and Guardian Analytics on sophisticated, automated malicious software strains that are increasingly targeting high-balance bank accounts. The report detailed how thieves using custom versions of the ZeuS and SpyEye Trojans have built automated, cloud-based systems capable of defeating multiple layers of security, including hardware tokens, one-time transaction codes, even smartcard readers. These malware variants can be set up to automatically initiate transfers to vetted money mule or prepaid accounts, just as soon as the victim logs in to his account.

“Many online banking systems….work based on the assumption that the customer’s PC is not infected,” ENISA wrote in an advisory issued on Thursday. “Given the current state of PC security, this assumption is dangerous. Banks should instead assume that PCs are infected, and still take steps to protect customers from fraudulent transactions.”

Continue reading →

Microsoft Patches Zero-Day Bug & 15 Other Flaws

July 10, 2012
19 Comments

Microsoft today issued a security patch to fix a zero-day vulnerability in Windows that hackers have been exploiting to break into vulnerable systems. The company also addressed at least 15 other flaws in its software, and urged customers to quit using the desktop Sidebar and Gadget capabilities offered in Windows 7 and Windows Vista.

By far the most urgent of the updates is MS12-043, which fixes a critical vulnerability in Microsoft XML Core Services that miscreants and malware alike have been using to break into vulnerable systems. Microsoft had already warned about limited, targeted attacks using this flaw, but late last month an exploit built to attack the XML bug was added to the BlackHole Exploit Kit, an automated browser exploit tool that is very popular in the criminal underground right now.

Other critical patch bundles include a fix for a dangerous flaw in the Microsoft Data Access Components (MDAC) of Windows, and an update to address a pair of vulnerabilities in Internet Explorer. Continue reading →

Plesk 0Day For Sale As Thousands of Sites Hacked

July 10, 2012
46 Comments

Hackers in the criminal underground are selling an exploit that extracts the master password needed to control Parallels’ Plesk Panel, a software suite used to remotely administer hosted servers at a large number of Internet hosting firms. The attack comes amid reports from multiple sources indicating a spike in Web site compromises that appear to trace back to  Plesk installations.

A hacker selling access to a Plesk exploit.

A miscreant on one very exclusive cybercrime forum has been selling the ability to hack any site running Plesk Panel version 10.4.4 and earlier. The hacker, a longtime member of the forum who has a history of selling reliable software exploits, has even developed a point-and-click tool that he claims can recover the admin password from a vulnerable Plesk installation, as well as read and write files to the Plesk Panel (see screen shot at right).

The exploit is being sold for $8,000 a pop, and according to the seller the vulnerability it targets remains unpatched. Multiple other members appear to have used it and vouched for its value.

It’s unclear whether this claimed exploit is related to a rash of recent attacks against Plesk installations. Sucuri Malware Labs, a company that tracks mass Web site compromises, told SC Magazine that some 50,000 sites have recently been compromised as part of a sustained malware injection attack, and that a majority of the hacked sites involved Plesk installations.

Continue reading →

How to Break Into Security, Grossman Edition

July 9, 2012
25 Comments

I recently began publishing a series of advice columns for people who are interested in learning more about security as a craft or profession. For the third installment in this series, I interviewed Jeremiah Grossman, chief technology officer of WhiteHat Security, a Web application security firm.

A frequent speaker on a broad range of security topics, Grossman stressed the importance of coding, networking, and getting your hands dirty (in a clean way, of course).

BK: How did you get started in computer security?

Grossman: For me it was…I could hack stuff and I did it in my spare time and someone offered me a job — which was Yahoo. But before that, I was just a UNIX admin. I was thinking about this question a lot, and what occurred to me is that I don’t know too many people in infosec who chose infosec as a career. Most of the people who I know in this field didn’t go to college to be infosec pros, it just kind of happened. They followed opportunity.

BK: You might have seen that the last two experts I asked had somewhat different opinions on this question, but how important is it that someone interested in this field know how to code?

Grossman: It’s tough to give solid advice without knowing more about a person. For instance, are they interested in network security or application security? You can get by in IDS and firewall world and system patching without knowing any code; it’s fairly automated stuff from the product side. But with application security, it is absolutely mandatory that you know how to code and that you know software. So with Cisco gear, it’s much different from the work you do with Adobe software security. Infosec is a really big space, and you’re going to have to pick your niche, because no one is going to be able to bridge those gaps, at least effectively.

BK: So would you say hands-on experience is more important that formal security education and certifications?

Grossman: The question is are people being hired into entry level security positions straight out of school? I think somewhat, but that’s probably still pretty rare. There’s hardly anyone coming out of school with just computer security degrees. There are some, but we’re probably talking in the hundreds. I think the universities are just now within the last 3-5 years getting masters in computer security sciences off the ground. But there are not a lot of students in them.

BK:  What do you think is the most important qualification to be successful in the security space, regardless of a person’s background and experience level?

Grossman: The ones who can code almost always [fare] better. Infosec is about scalability, and application security is about scalability. And if you can understand code, you have a better likelihood of being able to understand how to scale your solution. On the defense side, we’re out-manned and outgunned constantly. It’s “us” versus “them,” and I don’t know how many of “them,” there are, but there’s going to be too few of “us “at all times.  So whatever your solution is or design criteria, you’re going to have to scale it. For instance, you can imagine Facebook…I’m not sure many security people they have, but…it’s going to be a tiny fraction of a percent of their user base, so they’re going to have to figure out how to scale their solutions so they can protect all those users.

Continue reading →

Court Ruling Could Be Boon to Cyberheist Victims

July 6, 2012
22 Comments

A decision handed down by a federal appeals court this week may make it easier for small businesses owners victimized by cyberheists to successfully recover stolen funds by suing their bank.

The U.S. Federal Court of Appeals for the First Circuit has reversed a decision from Aug. 2011, which held that Ocean Bank (now People’s United) was not at fault for a $588,000 cyberheist in 2009 against one of its customers — Sanford, Me. based Patco Construction Co. The appeals court sent specific aspects of the earlier decision back to the lower court for review, but it encouraged both parties to settle the matter out of court.

The appeals court in Boston called the bank’s security systems “commercially unreasonable,” reversing a lower court ruling that Ocean Bank’s reliance on passwords and secret questions was in line with guidance set out by federal banking regulators. A copy of the decision is here (PDF).

Charisse Castagnoli, a bank fraud expert and independent security consultant, said the decision could open the door lawsuits from small businesses that have been similarly victimized with the help of outdated security procedures at their banks.

“What this opinion offers is a strong basis for victims to challenge the security implementations of their banks regardless of whether they agreed that the implementation was ‘commercially reasonable’ at a single point in time in a ‘shrink wrap’ type contract,” Castagnoli said.

Continue reading →

New Java Exploit to Debut in BlackHole Exploit Kits

July 5, 2012
44 Comments

Malicious computer code that leverages a newly-patched security flaw in Oracle’s Java software is set to be deployed later this week to cybercriminal operations powered by the BlackHole exploit pack. The addition of a new weapon to this malware arsenal will almost certainly lead to a spike in compromised PCs, as more than 3 billion devices run Java and many of these installations are months out of date.

I first learned about the new exploit from a KrebsOnSecurity reader named Dean who works in incident response for a financial firm. Dean was trying to trace the source of an infected computer in his network; he discovered the culprit appeared to be a malicious “.jar” file. A scan of the jar file at Virustotal.com showed that it was detected by just one antivirus product (Avira), which flagged it as “Java/Dldr.Lamar.BD”. The description of that threat says it targets a Javas vulnerability tagged as CVE-2012-1723, a critical bug fixed in Java 6 Update 33 and Java 7 Update 5.

The attack may be related to an exploit published for CVE-2012-1723 in mid-June by Michael ‘mihi’ Schierl. But according to the current vendor of the BlackHole exploit pack, the exact exploit for this vulnerability has only been shared and used privately to date. Reached via instant message, the BlackHole author said the new Java attack will be rolled into a software update to be made available on July 8 to all paying and licensed users of BlackHole.

Continue reading →