Harvesting Data on the Xarvester Botmaster

August 6, 2012
22 Comments

In January of this year, I published the results of an investigation into the identity of the man behind the once-infamous Srizbi spam botnet. Today’s post looks at an individual likely involved in running the now-defunct Xarvester botnet, a spam machine that experts say appeared shortly after Srizbi went offline and shared remarkably similar traits.

In this screenshot from Spamdot.biz, Ronnie chats with “Tarelka” the Spamdot nickname used by the Rustock botmaster. The two are discussing an M86 report on the world’s top botnets.

Srizbi was also known in the underground as “Reactor Mailer,” and customers could register to spam from the crime machine by logging into accounts at reactormailer.com. That domain was registered to a mserver@mail.ru, an address that my reporting indicates was used by a Philipp Pogosov. More commonly known by his nickname SPM, Pogosov was a top moneymaker for SpamIt, a rogue online pharmacy affiliate program that was responsible for a huge percentage of junk email over the past half-decade.

When reactormailer.com was shuttered, Srizbi customers were instructed to log in at a new domain, reactor2.com. Historic WHOIS records show reactor2.com was registered by someone using the email address ronnich@gmail.com. As I wrote in January, leaked SpamIt affiliate records show that the ronnich@gmail.com address was used by a SpamIt affiliate named Ronnie who was referred to the program by SPM.

The Srizbi botnet would emerge as perhaps the most important casualty of the McColo takedown at the end of 2008. At the time, all of the servers used to control the giant botnet were hosted at McColo, a crime-friendly hosting facility in Northern California. When McColo’s upstream providers pulled the plug on it, that was the beginning of the end for Srizbi. SPM called it quits on spamming, and went off to focus on his online gaming company.

But according a report released in January 2009 by Trustwave’s M86 Security called Xarvester: The New Srizbi, Xarvester (pronounced “harvester”) was a pharmacy spam machine tied to SpamIt that emerged at about the same time that Srizbi disappeared, and was very similar in design and operation. It appears that SPM may have handed control over his botnet to Ronnie before leaving the spamming scene.

Continue reading →

Uptick in Cyber Attacks on Small Businesses

August 3, 2012
38 Comments

New data suggests that cyber attacks aimed at small businesses have doubled over the past six months, a finding that dovetails with my own reporting on companies that are suffering six-figure losses from sophisticated cyber heists.

According to Symantec, attacks against small businesses rose markedly in the first six months of 2012 compared to the latter half of 2011. In its June intelligence report, the security firm found that 36 percent of all targeted attacks (58 per day) during the last six months were directed at businesses with 250 or fewer employees. That figure was 18 percent at the  end of Dec. 2011.

“There appears to be a direct correlation between the rise in attacks against smaller businesses and a drop in attacks against larger ones,” said Paul Wood, a security intelligence manager at Symantec. “It almost seems attackers are diverting their resources directly from the one group to the other.”

I’m seeing the same uptick, and have been hearing from more small business victims than at any time before — often several times per week.

In the second week of July, for example, I spoke with three different small companies that had just been hit by cyberheists (one of the victims asked not to be named, and the other didn’t want their case publicized). On July 10, crooks who’d broken into the computers of a fuel supplier in southern Georgia attempted to transfer $1.67 million out of the company’s accounts. When that failed, they put through a fraudulent payroll batch totaling $317,000, which the victim’s bank allowed.

The bank, First National Bank of Coffee County, managed to claw back an unusually large amount — approximately $260,000. The fuel company hired an outside forensics firm to investigate, and found that the trouble started on July 9, when the firm’s controller clicked a link embedded in an image in an email designed to look as though it was sent by the U.S. Postal Service and alerting the recipient about a wayward parcel. The link in the image loaded content from a site hosting the BlackHole exploit kit, which downloaded the ZeuS Trojan to the controller’s PC.

Interestingly, the fuel company and its bank said one of the money mules that the attackers recruited to help launder the stolen funds turned out to be an employee of Wells Fargo from Alabama. Many money mules are simply not the brightest bulbs, and it is usually difficult to prove that they weren’t scammed as well (because more often than not, the mules end up losing money).  But one would think people who work for banks should be at least be aware of these schemes, and held to a higher standard. What’s more, if this mule wasn’t complicit then he probably suspected something wasn’t right, because he had the funds sent to an account he controlled at a local credit union in Birmingham — rather than an account at Wells Fargo.

By the way, this is the second time I’ve encountered a money mule working at a major bank. Last year, I tracked down a woman at PNC Bank in Maryland who was hired by a mule recruitment gang and later helped move nearly $4,500 from a victim business in North Carolina to cybercriminals in Ukraine. She claimed she did not understand what she had done until I contacted her.

Continue reading →

Advertisement

Tech Support Phone Scams Surge

August 2, 2012
62 Comments

The bogus tech support boiler rooms must be working overtime lately. I’ve recently been inundated with horror stories from readers who reported being harassed by unsolicited phone calls from people with Indian accents posing as Microsoft employees and pushing dodgy PC security services.

These telemarketing scams are nothing new, of course, but they seem to come and go in waves, and right now it’s definitely high tide.  One reader’s story in particular really creeped me out. “Ron” wrote in to say his friend’s young daughter was the latest target.

“A friend called me to tell me that someone called his house, and using some ruse, convinced his 11 year-old daughter to ‘type in some numbers’ into the Run window,” Ron wrote. “When he got home, he turned the computer off, and we assume that it’s compromised and will need to be reformatted.”

Ron said that not long after that incident, he received a similar call. The woman on the phone told him that she was “the authorized security monitoring service for Microsoft Windows,” and that they had detected that his computer was infected with malware, which naturally he needed to have removed.

“The phone number was a Georgia area code, but I’m pretty sure she was from somewhere in India or Pakistan, based on the delay,  her accent and use of English — she said her name was Nancy,” Ron said. “She was also calling me at 7:30 am.”

IF AT FIRST YOU DON’T SUCCEED…

Wednesday evening, I heard from “J.C.,” an information security officer from a community bank in Maine. J.C. said he’d just been contacted by two customers who called after being snookered by these scams.

“The scammers said they were from Microsoft and had been shadowing the customers’ computer, and saw they had a virus on their PCs, and would they please open a command prompt and download something,” said J.C., who spoke on the condition that I not print his full name or that of his employer.

J.C. said both customers had been bamboozled by a company in India called NIAS E Business Solutions, to the tune of $199. J.C. said the bank blocked the transactions and canceled the customers’ debit cards. But that didn’t stop NIAS from trying to put through the charges two more times. The first time for a lesser amount of $99. When that failed, the NIAS tried to put through a $120 charge via Western Union!

Continue reading →

Dropbox: Password Breach Led to Spam

July 31, 2012
19 Comments

Two weeks ago, many Dropbox users began suspecting a data breach at the online file-sharing service after they started receiving spam at email addresses they’d created specifically for use at Dropbox. Today, the company confirmed that suspicion, blaming the incident on a Dropbox employee who had re-used his or her Dropbox password at another site that got hacked.

In a statement released on its blog this evening, DropBox’s Aditya Agarwal wrote:

Our investigation found that usernames and passwords recently stolen from other websites were used to sign in to a small number of Dropbox accounts. We’ve contacted these users and have helped them protect their accounts.

A stolen password was also used to access an employee Dropbox account containing a project document with user email addresses. We believe this improper access is what led to the spam. We’re sorry about this, and have put additional controls in place to help make sure it doesn’t happen again.

A Dropbox spokeswoman said the company is not ready to disclose just how many user account credentials may have been compromised by this password oops, noting that the investigation is still ongoing.

Continue reading →

Email-Based Malware Attacks, July 2012

July 31, 2012
45 Comments

Last month’s post examining the top email-based malware attacks received so much attention and provocative feedback that I thought it was worth revisiting. I assembled it because victims of cyberheists rarely discover or disclose how they got infected with the Trojan that helped thieves siphon their money, and I wanted to test conventional wisdom about the source of these attacks.

Top malware attacks and their antivirus detection rates, past 30 days. Source: UAB

While the data from the past month again shows why that wisdom remains conventional, I believe the subject is worth periodically revisiting because it serves as a reminder that these attacks can be stealthier than they appear at first glance.

The threat data draws from daily reports compiled by the computer forensics and security management students at the University of Alabama at Birmingham. The UAB reports track the top email-based threats from each day, and include information about the spoofed brand or lure, the method of delivering the malware, and links to Virustotal.com, which show the number of antivirus products that detected the malware as hostile (virustotal.com scans any submitted file or link using about 40 different antivirus and security tools, and then provides a report showing each tool’s opinion).

As the chart I compiled above indicates, attackers are switching the lure or spoofed brand quite often, but popular choices include such household names as American Airlines, Ameritrade, Craigslist, Facebook, FedEx, Hewlett-Packard (HP), Kraft, UPS and Xerox. In most of the emails, the senders spoofed the brand name in the “from:” field, and used embedded images stolen from the brands being spoofed.

The one detail most readers will probably focus on most this report is the atrociously low detection rate for these spammed malware samples. On average, antivirus software detected these threats about 22 percent of the time on the first day they were sent and scanned at virustotal.com. If we take the median score, the detection rate falls to just 17 percent. That’s actually down from last month’s average and median detection rates, 24.47 percent and 19 percent, respectively.

Continue reading →

Tagging and Tracking Espionage Botnets

July 30, 2012
14 Comments

A security researcher who’s spent 18 months cataloging and tracking malicious software that was developed and deployed specifically for spying on governments, activists and industry executives says the complexity and scope of these cyberspy networks now rivals many large conventional cybercrime operations.

Joe Stewart, senior director of malware research at Atlanta-based Dell SecureWorks, said he’s tracked more than 200 unique families of custom malware used in cyber-espionage campaigns. He also uncovered some 1,100 Web site names registered by cyberspies for hosting networks used to control the malware, or for “spear phishing,” highly targeted emails that spread the malware.

Although those numbers may seem low in the grand scheme of things (antivirus companies now deal with many tens of thousands of new malware samples each day), almost everything about the way these cyberspying networks are put together seems designed to mask the true scope of the operations, he found. For instance, Stewart discovered that the attackers set up almost 20,000 subdomains on those 1,100 domain names; but these subdomains were used for controlling or handing out new malware for botnets that each only controlled a few hundred computers at a time.

“Unlike the largest cybercrime networks that can contain millions of infected computers in a single botnet, cyber-espionage encompasses tens of thousands of infected computers spread across hundreds of botnets,” Stewart wrote in a paper released at last week’s Black Hat security convention in Las Vegas. “So each botnet…tends to look like a fairly small-scale operation. But this belies the fact that for every [cyber-espionage] botnet that is discovered and publicized, hundreds more continue to lie undetected on thousands of networks.”

Once you get past all the technical misdirection built into the malware networks by its architects, Stewart said, the infrastructure that frames these spy machines generally points in one of two directions: one group’s infrastructure points back to Shanghai, the other to Beijing.

“There have to be hundreds of people involved, just to maintain this amount of infrastructure and this much activity and this many spear phishes, collecting so many documents, and writing this much malware,” Stewart said. “But when it comes time to grouping them, that’s when it gets harder. What I can tell from the clustering I’m doing here is that there are two major groups in operation. Some have dozens of different malware families that they use, but many will share a common botnet command and control infrastructure.”

Domains connected to different cyber-espionage botnets typically trace back to one of two destinations in China, according to Dell SecureWorks.

Continue reading →

ATM Skimmers Get Wafer Thin

July 24, 2012
52 Comments

It’s getting harder to detect some of the newer ATM skimmers, fraud devices attached to or inserted into cash machines and designed to steal card and PIN data. Among the latest and most difficult-to-spot skimmer innovations is a wafer-thin card reading device that can be inserted directly into the ATM’s card acceptance slot.

That’s according to two recent reports from the European ATM Security Team (EAST), an organization that collects ATM fraud reports from countries in the region. In both reports, EAST said one country (it isn’t naming which) alerted them about a new form of skimming device that is thin enough to be inserted directly into the card reader slot. These devices record the data stored on the magnetic stripe on the back of the card as it is slid into a compromised ATM.

Wafer-thin skimmers like these are showing up in ATMs in one European nation. Images courtesy EAST.

Continue reading →

DoItQuick: Fast Domains for Dirty Deeds

July 23, 2012
19 Comments

A new service offered in the cybercriminal underground is geared toward spammers, scammers and malware purveyors interested in mass-registering dozens of dodgy domains in one go.

DoItQuick offers mass registration of malware domains.

The service — doitquick.net — will auto-register up to 15 domains simultaneously, choosing randomly named domains unless the customer specifies otherwise. DoItQuick sells two classes of domains: “white” domains that are “guaranteed” to stay registered for at least a year; and “black” domains that customers can use for illicit purposes and expect to last between 2 and 30 days before they are canceled.

This service makes it quite clear why customers might prefer the “black” domain registration service: “Domains for black deeds – these domains are registered for limited terms, from 2 to 30 days (average duration is about a week). Such domains are used for black and gray deeds. Low prices, fast registration! It is ideal for redirects, exploit packs, traffic, flood, botnets and other similar stuff. Domain names are checked for getting into blacklists, trackers and Spamhaus.”

Continue reading →

Top Spam Botnet, “Grum,” Unplugged

July 19, 2012
31 Comments

Nearly four years after it burst onto the malware scene, the notorious Grum spam botnet has been disconnected from the Internet. Grum has consistently been among the top three biggest spewers of junk email, a crime machine capable of blasting 18 billion messages per day and responsible for sending about one-third of all spam.

Source: Symantec Message Labs

The takedown, while long overdue, is another welcome example of what the security industry can accomplish cooperatively and without the aid of law enforcement officials. Early press coverage of this event erroneously attributed part of the takedown to Dutch authorities, but police in the Netherlands said they were not involved in this industry-led effort.

The Grum ambush began in earnest several weeks ago at the beginning of July, following an analysis published by security firm FireEye, a Milpitas, Calif. based company that has played a big role in previous botnet takedowns, including Mega-D/Ozdok, Rustock, Srizbi.

Atif Mushtaq, senior staff scientist at FireEye, said the company had some initial success in notifying ISPs that were hosting control networks for Grum: The Dutch ISP Ecatel responded favorably, yanking the plug on two control servers. But Mushtaq said the ISPs where Grum hosted its other control servers — networks in Russia and Panama — proved harder to convince.

Continue reading →

Cyberheist Smokescreen: Email, Phone, SMS Floods

July 18, 2012
35 Comments

It was early October 2011, and I was on the treadmill checking email from my phone 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.

Shortly after the email barrage began, I fired off a note to Google‘s public relations folks, asking for advice and assistance. Thankfully, my phone line was not a subject of the attack, and I was able to communicate what I was seeing to Google’s team. They worked to fight the attack for the better part of that day, during which time my inbox received tens of thousands of emails, burying hundreds of legitimate emails in page after page of junk messages (in the screen shot above, the note to Google spokesman Jay Nancarrow is at the top of the junk message pile).

What was most surprising about these messages was that many of them contained fairly spammy subject lines that should have been easily caught by Google’s junk mail filters. Each junk message contained nothing but pages full of garbled letters and numbers; the text of each missive resembled an encrypted message.

Google’s engineers managed to block a majority of the junk messages after about six hours, but the company declined to talk about what caused the attack to succeed. It took many more hours to sift through the junk messages to fish out the ones I wanted.

“This isn’t about a hole in Gmail or an exploit — it’s more a matter of spam dynamics and what may be able to get through more easily under certain circumstances,” Nancarrow said. “As a result, we can’t provide specifics that could aid spammers in trying new campaigns.”

Continue reading →