Malware

Malware implants on Cisco routers revealed to be more widespread

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Researchers detected 200 Cisco routers with malicious firmware in 31 countries, with the U.S. having the largest number of potentially infected routers.

Attackers have installed malicious firmware on nearly 200 Cisco routers used by businesses from over 30 countries, according to Internet scans performed by cyber crime fighters at the Shadowserver Foundation.

Last Monday, FireEye subsidiary Mandiant warned about new attacks that replace the firmware on integrated services routers from Cisco Systems. The rogue firmware provides attackers with persistent backdoor access and the ability to install custom malware modules.

At the time Mandiant said that it had found 14 routers infected with the backdoor, dubbed SYNful Knock, in four countries: Mexico, Ukraine, India, and the Philippines. The affected models were Cisco 1841, 8211, and 3825, which are no longer being sold by the networking vendor.

Cisco

Since then, the Shadowserver Foundation, a volunteer organization that tracks cyber crime activities and helps take down botnets, has been running an Internet scan with Cisco’s help in order to identify more potentially compromised devices.

The results confirmed Mandiant’s suspicions: there are more than 14 routers infected with SYNful Knock out there. Shadowserver and Cisco identified 199 unique IP (Internet Protocol) addresses in 31 countries that show signs of compromise with this malware.

The U.S. has the largest number of potentially infected routers, 65. It is followed by India with 12 and Russia with 11.

Shadowserver plans to start notifying network owners who have signed up for the organization’s free alert service if any of the compromised routers fall into their IP blocks.

“It is important to stress the severity of this malicious activity,” the organization said Monday in a blog post. “Compromised routers should be identified and remediated as a top priority.”

By controlling routers, attackers gain the ability to sniff and modify network traffic, redirect users to spoofed websites and launch other attacks against local network devices that would otherwise be inaccessible from the Internet.

Since the devices targeted by the SYNful Knock attackers are typically professional-grade routers used by businesses or ISPs, their compromise could affect large numbers of users.

Cisco has been aware of attackers using rogue firmware implants for several months. The company published a security advisory in August with instructions on how to harden devices against such attacks.

Source:http://www.infoworld.com/

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MWZLesson POS Trojan borrows code from other malware

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Security experts at Doctor Web have discovered a new PoS Trojan dubbed MWZLesson that borrows code from other popular malicious software.

Security experts at Dr. Web have discovered a new PoS Trojan that was designed by mixing code from other malware.

The new PoS Trojan, dubbed Trojan.MWZLesson, was designed reusing the code of other popular malware, including the Dexter PoS and the Neutrino backdoor.

“This code was borrowed from another Trojan designed for POS terminals and named Trojan.PWS.Dexter. The malware sends all acquired bank card data and other intercepted information to the command and control server.” states the blog post published by Dr. Web.

Mwz

Like its predecessors, MWZLesson compromises the POS terminals, scraping the RAM memory to search for credit card data. Once infected the PoS system, the malware communicates with the server over the HTTP protocol, it steals card data and sends it to the command and control server through GET and POST requests.

Trojan.MWZLesson can intercept GET and POST requests sent from the infected machine’s browsers (Firefox, Chrome or Internet Explorer). Such requests are forwarded to the command and control server run by cybercriminals.” continues the post.
Trojan.MWZLesson can update itself, download and run additional files, find specific documents, and even mount an HTTP Flood attack.

The experts at Dr.Web discovered that the Trojan.MWZLesson also implements features to avoid detection and eradicate other malware that infected the PoS malware.

“Trojan.MWZLesson checks for virtual environments and debuggers and gather information on the infected machine. The newly discovered PoS malware is able to remove other malware present on the machine and is able to exfiltrate different kinds of data.”

The discovery of the Trojan.MWZLesson confirms the great interest of the criminal crews in infecting POS terminals and their abilities in recyclying code of older and efficient malware.  

Source:http://securityaffairs.co/

Carbanak Banking Trojan Returns with a New Series of Attacks

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The Carbanak banking trojan was spotted once again in attacks on financial institutions and businesses across the globe, as CSIS is reporting.

Carbanak, also known as Anunak, was previously discovered and analyzed by Russian-based Kaspersky Lab security firm, in February 2015.

Back then, Kaspersky Lab was estimating that the group behind Carbanak infiltrated up to 100 financial institutions worldwide, gaining control over their computers, and stealing around $1 billion / €876.7 million.

Since then, the trojan has been making sporadic returns, always changing one small detail in its operation to keep up with firewall and antivirus updates.

Carbanak Banking Trojan Returns with a New Series of Attacks

New Carbanak variant uses a new proprietary communications protocol

As the CSIS team is now reporting, a new variant of the trojan has been observed in the wild, targeting the same kind of financial corporations as before.

This version of Carbanak is different from the original, using a predefined IP address instead of random generated domains to talk to the C&C server, employing random generated file names, and featuring a new proprietary protocol for managing its plugins and internal communications.

Just as before, Carbanak still hides in an infected svchost.exe process, keeps its modular structure that allows it to shape shift and adapt to victims, and continues to use a legitimate code-signing certificate to avoid detection.

According to CSIS, this new version of Carbanak uses a code-signing certificate issued by Comodo, to what appears to be a legal Russian-based business.

Carbanak continues to brazenly flaunt its Russian connection

Security researchers believe the criminals behind Carbanak have registered a real company with the sole purpose of having a legal base for some of their fraudulent transactions.

“Carbanak-related transfers are rather huge,” says the CSIS team. “Possibly, they have registered a company and opened bank accounts in order to receive their stolen money while having full control of the transferring process.”

Previously ESET researchers found a version of Carbanak using stolen certificates belonging to companies Moscow-based companies Stroi-Tekh-Sever, Flash, OOO “Techcom” and Torg-Group.

The Russian connection for the Carbanak trojan is very well known, Trend Micro researchers previously linking one of its C&C servers to an IP owned by the Russian Security Service (FSB).

Source:http://news.softpedia.com/

Hacker pleads guilty in Facebook malware and spam scheme

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A New York man has pleaded guilty in federal court for violating an anti-spam law, although his alleged involvement in cybercriminal activities went way beyond sending spam.

Eric L. Crocker, the accused hacker, pleaded guilty to just one charge carrying a maximum penalty under the CAN-SPAM Act of three years in prison and a fine of $250,000.

Crocker was allegedly involved in hacking computers to create an enormous botnet that he maintained for co-conspirators, who used the network of compromised computers to send spam and much more.

Hacker pleads guilty in Facebook malware and spam scheme
Hacker pleads guilty in Facebook malware and spam scheme

Crocker was one of a dozen people arrested in the US in July for their connection with the notorious Darkode cybercrime forum.

According to US Attorney David J. Hickton, of the Western District of Pennsylvania, Crocker used Darkode to market his botnet.

An unidentified co-conspirator paid Crocker and others $200-$300 for every 10,000 computers they infected as part of the botnet, according to the federal indictment.

To build the botnet, Crocker infected victims through Facebook.

As described by law enforcement, Crocker used a “Facebook Spreader” malware called Slenfbot to infect victims via booby-trapped links in Facebook chat messages.

It worked like this: a user became infected after clicking on a link to the malware sent to them via a Facebook message. The malware was then used to send phishing messages to the victim’s friends on the social network.

When those recipients clicked on a link in the message, thinking it was from their friend, they automatically downloaded the malware and so the cycle began again.

Once the malware was on a victim’s computer, the computer became a “bot” that Crocker could control remotely to send further spam.

The Darkode forum, where Crocker allegedly sold his services as “Phastman,” was taken down by the FBI and Europol in July 2015.

Described by the FBI as “the most sophisticated English-speaking forum for criminal computer hackers around the world,” Darkode’s small membership used it as a hub for buying and selling services including malware, zero-day exploits, and botnets.

Members reportedly included some of the Lizard Squad hackers responsible for denial-of-service attacks on Sony and Microsoft.

Source:https://nakedsecurity.sophos.com

Lenovo used shady ‘rootkit’ tactic to quietly reinstall unwanted software

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Lenovo has been caught using a technique, often used by some malware to withstand being deleted, to reinstall unwanted software on the computers it sells.

As reported on a number of forums and news-sharing sites, some users have accused the computer maker of overwriting Windows files to ensure its own-brand software and tools were installed — even after a clean install of the operating system.

The issue was first reported as early as May, but was widely reported Tuesday.

The “rootkit”-style covert installer, dubbed the Lenovo Service Engine (LSE), works by installing an additional program that updates drivers, firmware, and other pre-installed apps. The engine also “sends non-personally identifiable system data to Lenovo servers,” according to the company. The engine, which resides in the computer’s BIOS, replaces a core Windows system file with its own, allowing files to be downloaded once the device is connected to the internet.

Lenovo used shady 'rootkit' tactic to quietly reinstall unwanted software
Lenovo used shady ‘rootkit’ tactic to quietly reinstall unwanted software

But that service engine also put users at risk.

In a July 31 security bulletin, the company warned the engine could be exploited by hackers to install malware. The company issued a security update that removed the engine’s functionality, but users must install the patch manually.

Many Yoga and Flex machines (among others) running Windows 7, Windows 8, and Windows 8.1 are affected by the issue. Business machines, such as Think-branded PCs, are not affected.

A full list of affected notebooks and desktops is listed on Lenovo’s website.

It’s not the first time Lenovo has been caught in a privacy-related pickle.

Earlier this year, the computer maker was forced to admit it had installed Superfish adware over a three-month period on new machines sold through retail channels. The adware had the capability to intercept and hijack internet traffic flowing over secure connections, including online stores, banks, among others.

Users were told they should “not use their laptop for any kind of secure transactions until they are able to confirm [the adware] has been removed,” security researcher Marc Rogers told ZDNet at the time.

It was thought as many as 16 million consumers and bring-your-own-device users were affected by the preinstalled adware.

Source:http://www.zdnet.com/

“Funtenna” software hack turns a laser printer into a covert radio

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LAS VEGAS—During the Cold War, Soviet spies were able to monitor the US Embassy in Moscow by using a radioretroreflector bug—a device powered, like modern RFID tags, by a directed radio signal. But that was too old school for Ang Cui, chief scientist at Red Balloon Security and a recent PhD graduate of Columbia University. He wanted to see if he could do all of that with software.

Building on a long history of research into TEMPEST emanations—the accidental radio signals given off by computing systems’ electrical components—Cui set out to create intentional radio signals that could be used as a carrier to broadcast data to an attacker even in situations where networks were “air-gapped” from the outside world. The result of the work of his research team is Funtenna, a software exploit he demonstrated at Black Hat today that can turn a device with embedded computing power into a radio-based backchannel to broadcast data to an attacker without using Wi-Fi, Bluetooth, or other known (and monitored) wireless communications channels.

It turns out that embedded computing devices can be used to broadcast data covertly in all sorts of ways, as demonstrated in this video from Ang Cui's Funtenna project.
It turns out that embedded computing devices can be used to broadcast data covertly in all sorts of ways, as demonstrated in this video from Ang Cui’s Funtenna project.

Cui has previously demonstrated a number of ways to exploit embedded systems, including printers and voice-over-IP phones. In 2012, he demonstrated an exploit of Cisco phones that turned on the microphone and transformed phones into a remote listening device. Michael Ossmann of Great Scott Gadgets, a hardware hacker who has done some development of exploits based on concepts from the NSA’s surveillance “playset,”  suggested to Cui that he could turn the handset cord of the phone into a “funtenna”—an improvised broadcast antenna generating radio frequency signals programmatically.

With just seven lines of code injected into the embedded computer of an otherwise unmodified laser printer, Cui was able to turn the printer into a radio transmitter by simply leveraging the electrical properties of existing input and output ports on the printer. By rapidly flipping the power state of general purpose input/output (GPIO) pins, Pulse Width Modulation (PWM) outputs, and UART (serial) outputs on a Pantum P2502W laser printer—“the cheapest laser printer we could find,” Cui said—the Funtenna hack was able to create a modulated radio signal as a result of the magnetic fields created by the voltage and resulting electromagnetic waves.

The hack couldn’t generate signals strong enough using the relatively short wires of the GPIO connections on the printer. Despite flipping every GPIO output available, he only got an effective range of transmission of a few meters. Instead, the UART output with a 10-foot cable generated a signal that could be picked up from outside a building—even through reinforced concrete based on Cui’s research.

The demonstration, Cui said, shows that embedded devices need their own built-in defenses to truly be secure. And printers are merely a starting point for Cui’s work. The same sort of attack could conceivably be launched from any “internet of things” device or other system with onboard computing power—including network routers and firewalls.

“A network [intrusion detection system] is no substitute for host-based defense,” he said. “You could monitor every known spectrum, but it would be very expensive and may not work. The best way is to have host-based defense baked into every embedded device.”

Source:http://arstechnica.com/

WordPress 4.2.3 is out, update your website now

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If you own a website then there’s a good chance – better than one in five – that it uses the WordPress Content Management System (CMS).

If it is, you should update it now.

The latest version, version 4.2.3, was released on 23 July 2015 and includes a fix for a cross-site scripting (XSS) vulnerability that your website could do without.

The flaw allows WordPress users who have Contributor or Author roles to add javascript to a site (something normally reserved for Editors and Administrators) using specially crafted shortcodes.

WordPress 4.2.3 is out, update your website now
WordPress 4.2.3 is out, update your website now

Attackers who can add javascript to a site can use it to do all manner of damage such as infecting users with malware or stealing their cookies.

Some measure of protection is afforded by the fact that attackers will need a way to log in to a vulnerable site with at least Contributor privileges.

However, it is far easier (and safer) to simply close off a backdoor than to try and second-guess how an attacker might lever it open – and you should update even if you think you won’t be vulnerable.

Across the hundreds of millions of WordPress sites that exist there are likely to be plenty that have registration or membership schemes for unknown users and plenty more that unwittingly suffer from badly configured user rights, disgruntled ex-users, poorly protected passwords and session cookies or users who’ve had credentials stolen.

Any one of those things (and no doubt more I’ve not thought of) could give an attacker the foothold they need.

And bother they will because of the vast size of the WordPress install-base.

Criminal gangs use huge networks of compromised computers, called botnets, to spread malware and send spam and they’re always looking for easy ways to harvest more victims.

Vulnerabilities in popular web platforms like WordPress and Drupal provide an easy way for them to target tens or even hundreds of millions of websites at a time with automated tools.

And they can get those automated attacks up and running fast.

In October 2014, the Drupal security team reported that automated attacks started appearing within three hours of a Highly Critical vulnerability being announced.

In a sobering follow-up message two weeks later they told their users toassume that their site had been compromised if it hadn’t been patched within seven hours of the original announcement!

It’s why the number one rule of WordPress security is always run the latest version of WordPress.

Fortunately that’s become a lot easier since October 2013 when WordPress released the first version of their software, version 3.7, with automatic security updates (something Drupal is still waiting for).

Sites with automatic updates enabled began receiving their updates almost immediately.

If your site doesn’t update automatically you can upgrade by logging in and going to Dashboard → Updates and clicking “Update Now” or bydownloading a copy of the software and installing it yourself.

Source:https://nakedsecurity.sophos.com