Threat Lab

We spotted an interesting behavior from a Trojan dropper that belongs to a family of malware named Ponmocup. The file, update.exe (MD5 89f4ea9f0240239e0d97f202d22af325) leaves behind a payload that, among other things, modifies the Hosts file on infected computers to prevent users from visiting popular Bittorrent sites, including The Pirate Bay.

It’s an odd behavior for several reasons. We don’t see many Trojans modify the Hosts file anymore because such modifications are so easily reversed. But more to the point: Why would a criminal care whether anyone else be able to browse The Pirate Bay, a Web site known to host torrents of pirated, copyrighted material? And why also block Mininova, which changed its content model more than a year ago and no longer hosts copyrighted files? None of these things make sense.

It seems at first blush like the act of someone who fancies himself a copyright vigilante, sophisticated enough to build a custom tool such as this, but who isn’t smart enough to know which sites to block.

read more…

A Trojan that pulls a sly performance of now-you-see-me-now-you-don’t disguises itself on an infected system as the Adobe Updater, a real program that’s installed alongside such mainstay applications as the Adobe Reader. This method of hiding in plain sight means the downloader, Trojan-Downloader-Karagany, may remain active on an infected system for an extended period of time, reinfecting PCs even after the more obvious payloads have been cleared up.

During the initial infection, subtlety is this Karagany’s strong suit. When executed, it pulls an act I find slightly more interesting than the conventional file copies itself from one place to another, then deletes the original behavior that is so common among contemporary malware.

In this case, the malware app (which uses an Adobe icon) does copy itself to another location — the Application DataAdobe folder under the currently logged-in user’s account, using the filename AdobeUpdater.exe — but leaves behind a benign program afterward, in exactly the same place as the original, and with the same filename as the original. Watch this video to see just how slick this shell game can be.

[vimeo 17098939]

The Trojan makes a duplicate of a legitimate Windows app (the Microsoft HTML Application Host, or MSHTA.exe), naming the copy with the same filename the Trojan used at the time it was executed, and replaces itself with the renamed MSHTA.exe in precisely the same location. The effect is low-key — the program simply seems to lose its icon.

read more…

While nowhere near the size of the mammoth Facebook, the social network Multiply is no slouch. Based in Boca Raton, Florida, the site is designed around not only sharing photos and videos with friends and family, but also a relatively novel concept called social shopping, which permits users of the site to shop together in a virtual marketplace, or even set up an Internet storefront. At last count, according to Multiply’s blog, the site has over 12 million users, which means that the Multiply Market may be one of the largest single shopping Web sites in Southeast Asia, where most of its users live.

I would never have even known about Multiply (it’s one of nearly 200 active social network sites listed on Wikipedia) if it weren’t for one of our Threat Research analysts, Rhoda Aronce, who hails from the Philippines and uses Multiply to keep in touch with family. She received an odd-looking message that appeared to come from Multiply on her Yahoo mail account yesterday, and it set off alarm bells. Good thing, too, because it looks like a spam campaign targeting Multiply users is trying to infect those users’ computers with a rogue AV that calls itself Antivirus Solution 2010 Next.

The initial spam message uses familiar social engineering tropes: It’s a message that looks like it was sent via Multiply’s servers to Rhoda’s Yahoo mail account. The message body reads

heyy! (username), do we know from some place isn’t it? so here’s a special video i did for you, ull recall me!, pls holler me back!!!, kisses <3

The message is dominated with a photo of what looks like a streaming video window that says Click here to see movie. That’s where the fun begins for researchers, but please, don’t click this at home, especially if you’re in the middle of shopping online. Leave getting infected to the professionals. If you see something like this in your email inbox, just delete the message.

read more…

In September, I posted an item about a dropper which we call Trojan-Dropper-Headshot. This malware delivers everything including the kitchen sink when it infects your system. It has an absolute ton of payloads, any of which on their own constitute a serious problem. All together, they’re a nightmare.

Among the payloads, we’ve seen this monstrosity drop downloaders (Trojan-Agent-TDSS and Trojan-Downloader-Ncahp, aka Bubnix), adware (Virtumonde, Street-Ads, and Sky-banners), keyloggers (Zbot and LDpinch), clickfraud Trojans (Trojan-Clicker-Vesloruki and at least three other generic clickers), and a Rogue AV called Antivir Solution Pro. So this is one nasty beast that has no qualms about using the shotgun approach to malware infections.

But we also noticed that it has added yet another intriguing installer to its panoply of pests: It’s a small executable named seupd.exe (search engine updater?) that makes two minor (but obnoxious) modifications to Firefox. The result of these modifications changes the behavior of Firefox’s search bar, the small box that lets you send queries directly to search engines, located to the right of the Address Bar.

The modifications are not immediately apparent unless you try to search Google for something, using either the Search Box or the Address Bar: Instead of sending your search to Google, the browser submits search queries to one of six different domains not owned by Google, but which appear to use the Google API to provide results — and, presumably, earn a little ad revenue on the side.
read more…

By Ian Moyse, EMEA Channel Director

With Christmas fast approaching, (lest we forget the shops have kindly put all the Christmas goods out in September and early October again!) we can expect online attacks to increase as per their normal schedules, ramping up through the end of the year.

With apologies to Sir Winston Churchill, never in the field of Internet conflict was so much harm done to so many by so few.

For all the benefits the Internet provides our lives, no single technology has given so few criminals the ability to cheaply and easily target the many. We’ve seen the rise of the dark economy, where far flung cybercriminals trade skills and produce burglary tools for sale, and we live with the consequences every day. Sophisticated attacks target both our computers and our users, through social engineering.

While the increases in cybercrime incidents seem to indicate a greater number of attackers, the reality is that the growth of the Internet itself gives rise to the ever-increasing volume of botnets, keyloggers and spam. The Internet makes us all contactable and, to a degree, easily identifiable. As we surf the Web, we leave traces of our presence in the form of electronic footprints — cookies, blog postings, and of course, our activities on social networks and other online forums.

And yet, no matter what we do to stem the tide, the problems only seem to increase in size and scope.

You can tune in and listen live to more of Ian Moyse’s predictions for next year’s most serious threats in his free Webinar, ThreatNet 2011, Thursday, November 4, at 10am Eastern.

read more…

By Andrew Brandt and Curtis Fechner

It’s appropriate that this year’s Blizzcon, the two-day celebration of all things World of Warcraft, takes place during National Cyber Security Awareness Month. No other game is as heavily targeted by thieves as WoW, so we thought this would be as good a time as any to run down some of the malware threats that face gamers. 2010 has been a big year for Trojans that steal game passwords or license keys.

The people who create malware targeting online games show no signs of relenting, nor are they laying down on the job. Innovation is the name of the game, and password-stealers this year innovated their infection techniques to make them more effective and even harder to detect.

Two-factor authentication tokens, such as the Blizzard Authenticator, do a great job of preventing fraud. If you play WoW, the seven or so bucks the Authenticator costs can prevent a lot of headaches if your account becomes compromised by either a Trojan or a phishing Web site. The Authenticator displays a series of numbers that change about once a minute, and a gamer needs to enter these numbers along with a username and password to play the game.

However, while gamers who play Blizzard’s games might find themselves at reduced risk of phishing thanks to the Authenticator, other companies that operate the kinds of massively-multiplayer games most targeted by phishing pages and malware are also targets for theft, and don’t yet offer an equivalent method of securing login credentials.

read more…

Last week, Activision/Blizzard released a long-anticipated patch for its immensely popular game, World of Warcraft. While I don’t play this game, a number of our Threat Researchers do, and they’ve been on the lookout for shenanigans. Curtis Fechner found a doozy.

The update comprises a major overhaul of many core systems within the game, affecting the graphics engine, game rules, player abilities, and also the interface. Many players use downloadable, player-created add-ons to further customize the appearance of the user interface; Patches as comprehensive as this one mean that many of the old add-ons simply won’t work until the add-on’s creator releases a new version.

So this week’s rush to patch the game and update some add-ons led to some interesting news. One of the add-ons Curtis uses is something called RatingBuster, written by a player who goes by the name WhiteTooth. The add-on, available from a number of locations, typically comes in the form of a .zip archive and contains several plain text files (called LUA files). But earlier this year, someone registered the domain name ratingbuster.org and began serving Trojans from this legitimate looking Website instead of the RatingBuster add-on.

This fake RatingBuster comes in the form of an executable file named rbv1.4.9.exe — running unknown executables is a big no-no most WoW players know to avoid. This particular executable is a self-extracting RAR archive, which utilities like WinRAR can easily unpack. Inside the archive is another file, a single executable named bot.exe (22794 bytes, MD5: 6831c35e6d19ea0a1e1e9e346368b3e3). This is our malware installer, stored inside the other installer.

read more…

The Tacticlol downloader, responsible for a lot of infections over the past year, propagates in two ways: via drive-by downloads, and as a .zip archive attached to messages. Maybe the spam filtering companies finally caught on to the trick, or maybe the Tacticlol distributors are just trying to mix it up, but the latest sample to come over the transom has me scratching my head.

Like most others, this sample came attached to an email made to look like a message that UPS would never send. Once again, the message tries to convince the recipient that the attached file is a shipping label the recipient needs to open and print before he or she can “receive the parcel.” And, as always, the attachment contains an executable installer for the Trojan.

Dear customer

Your parcel has arrived at the post office on October 9. Our
Driver was unable to deliver the parcel to your address.
To receive a parcel you must go to the nearest UPS office and
show your mailing label.
Mailing label is attached to this letter.

You need to print mailing label, and show it in UPS office to
receive the parcel.

Thank you for your attention.
UPS International Services.

But this time, instead of sending a .zip archive with a .zip extension, they sent a message with a .zip archive that has a .jpg extension. And, yeah, that just doesn’t work.

The file isn’t a JPEG image file. If you try to open it in a browser or an image editor, the editor simply errors out and tells you it isn’t an image file, and the story ends right there. I’m sure some Russian malware distributor has been double-facepalming over the waste of a perfectly good scam. Social engineering: You’re doing it wrong.

read more…

It’s been more than a week since we started seeing spam email, supposedly sent by the EFTPS (Electronic Federal Tax Payment System, a division of the US Department of the Treasury), informing recipients in dire, bolded text that Your Federal Tax Payment ID: 01037513 has been rejected. I had hoped it would be a faded memory by now, but apparently it just won’t die.

Spam, ladies and gentlemen. It’s a lie, cooked up in a criminal’s troubled mind, with the goal of convincing signficant numbers of people to click a link in the message. It’s a pretty contrived message, which also informs the recipient, in characteristic Spamglish, to “In other way forward information to your accountant adviser.” Apparently, whoever began the campaign needs a refresher in the history of recent Internet scams — this particular scam has been going on again, off again for four years.

Judging by the number of other people asking about this online, the campaign must have been massive. And like a squirrel harassing birds on a feeder, it’s not likely to go away anytime soon.

In this case, the link looks like it’s supposed to go directly to the EFTPS Web site, but the author of the spam simply hyperlinked the URL to point elsewhere. In the case of some of the samples we’ve seen, the messages link to a page on the domain freesite.org; That page contains a single line of HTML to redirect victims to yet another site, which has since been shut down.

So while the spam messages continue to percolate through the email networks, it’s a tiger with no teeth or claws anymore. If you clicked the link, only to end up on a blank page at eftpsid0353546.com — a domain hosted in Russia, on the same server as such esteemed Web sites as qualityhealthmall.com and fdadrugmall.com — rest assured, you’re probably safe, but need to practice the first two parts of Stop. Think. Connect.

Every browser can, at the user’s discretion, be set up to remember passwords. In general, Webroot advises most users not to set the browser to store login credentials, because they’re so easily extracted by password-stealing Trojans like Zbot. In Firefox, for example, you can click Tools, Options, then open the Security tab, and uncheck a box that tells the browser to remember passwords entered into Web forms. (The box is checked by default.)

But in the course of taking a more thorough look at a Trojan that came to our attention in July, we were surprised to see the Trojan modify a core Firefox file. Upon closer inspection, the Trojan patches a file named nsLoginManagerPrompter.js. The patch adds a few lines of code (displayed above), and comments-out other portions of code, that dictate whether Firefox prompts the user to save passwords when he or she logs into a secure site.

Before the infection, a default installation of Firefox 3.6.10 would prompt the user after the user clicks the Log In button on a Web page, asking whether he or she wants to save the password. After the infection, the browser simply saves all login credentials locally, and doesn’t prompt the user.

read more…

Today’s the official kickoff for National Cyber Security Awareness Month, and the organizations supporting the event, including the National Cyber Security Alliance, the Anti-Phishing Working Group, and dozens of corporate citizens including Webroot, want you to protect your computer and your personal information. So they’ve come up with a three word campaign slogan they hope will become conventional wisdom for every Internet user: Stop. Think. Connect. Think of it as the 21st century equivalent of looking both ways before crossing the street.

In my case, they’re preaching to the choir. For years, I’ve advocated that people treat everything they see online critically, and to scrutinize information before acting on it. That’s because the army of criminals who commit fraud and theft over the Internet on a daily basis rely on you to not stop, not think, and to click links or open files immediately, without regard to the consequences of your actions. That’s how most people infect themselves. If you stop and think before you connect, you can prevent most of these infections yourself, simply by exercising a little restraint.

It’s hard to think of a major cybercrime outbreak over the past year that hasn’t relied, to some extent, on the naivete of its targets. Security professionals call these tricks “social engineering,” but that’s just a geeky term for criminal skullduggery that’s as common offline as online. The ruse almost always tries to invoke an adrenaline-fueled need for an immediate response — usually out of fear, greed, or panic — on the part of a victim. The victim ends up in a mental state where they are likely to make rash, impulsive decisions. And they do.

Putting the brakes on social engineering tricks usually takes all the steam out of them. To that end, I’d like to show you examples of five of the most common cyberscams that lead to the loss of personal information or sensitive data. Hopefully, if you know what to expect, you’ll simply walk away from the encounters unscathed.

read more…

It’s been more than a week that we at Webroot, and countless others, have been getting floods of bogus messages with HTML attachments. I thought I’d give the curious readers of this blog a quick glance at one of the drive-by sites that load in the browser if you try to open the file.

As I’d mentioned previously, the HTML files themselves simply contain highly obfuscated Javascript (code that’s hard for humans to read but easy for machines to interpret). When you try to load those malicious scripts into a browser, the script instructs the browser to load a page from another Web site. In fact, the file I saw today goes to server 1, which bounces the browser to server 2, and then a script on server 2 loads more files from servers 3 & 4 in a full-screen iFrame.

In the end, what I saw looked like an update to what has become the “classic” Javascript fakealert. Unfortunately for the malware distributors, this so-called update is laughably obvious. These are clearly not the sharpest tacks in the box.

It all starts with a warning popup which reads:

There is a big chance that your computer is infected! They can cause data loss and file  damages and need to be fixed as soon as possible. Return to Microsoft Security Assessment Tool and download it to   guard your PC.

Wow, really? How big is the chance? Is this more like a scratch-off lottery ticket level of chance, or is it closer to a look under the bottle cap to see if you win chance? What they don’t tell you is that your chance of becoming infected with an annoying rogue increases to about 100% if you continue down this well-worn path. read more…