Tag Archives: Ransomware

U.S. hospitals face growing ransomware threat

The Hollywood Presbyterian Medical Center is pictured in Los Angeles

By Jim Finkle

(Reuters) – U.S. hospitals should brace for a surge in “ransomware” attacks by cyber criminals who infect and shut down computer networks, then demand payment in return for unlocking them, a non-profit healthcare group warned on Friday.

The Health Information Trust Alliance conducted a study of some 30 mid-sized U.S. hospitals late last year and found that 52 percent of them were infected with malicious software, HITRUST Chief Executive Daniel Nutkis told Reuters.

The most common type of malware was ransomware, Nutkis said, which was present in 35 percent of the hospitals included in the study of network traffic conducted by security software maker Trend Micro Inc.

Ransomware is malicious software that locks up data in computers and leaves messages demanding payment to recover the data. Last month, Hollywood Presbyterian Hospital in Los Angeles paid a ransom of $17,000 to regain access to its systems.

This week, an attack on MedStar Health forced the largest healthcare provider in Washington, D.C., to shut down much of its computer network. The Baltimore Sun reported a ransom of $18,500 was sought. MedStar declined to comment.

HITRUST said it expects such attacks to become more frequent because ransomware has turned into a profitable business for cyber criminals.

The results of the study, which HITRUST has yet to share with the public, demonstrate that hackers have moved away from focusing on stealing patient data, Nutkis said.

“If stuff isn’t working, they move on. If stuff is working, they keep doing it,” said Nutkis. “Organizations that are paying have considered their options, and unfortunately they don’t have a lot of options.”

Extortion has become more popular with cyber criminals because it is seen as a way to generate fast money, said Larry Whiteside, a healthcare expert with cyber security firm Optiv.

Stealing healthcare data is far more labor intensive, requiring attackers to keep their presence in a victim’s network undetected for months as they steal data, then they need to find buyers, he added.

“With ransomware I’m going to get paid immediately,” Whiteside said.

Frisco, Texas-based HITRUST’s board includes executives from Anthem, Health Care Services, Humana, UnitedHealth and Walgreens.

(Reporting by Jim Finkle; By Tiffany Wu)

FBI issues ransomware alert, requests help from U.S. businesses

ransomware

(Reuters) – The FBI is asking businesses and software security experts for emergency assistance in its investigation into a pernicious new type of “ransomware” virus used by hackers for extortion.

“We need your help!” the Federal Bureau of Investigation said in a confidential “Flash” advisory that was dated March 25 and obtained by Reuters over the weekend.

Ransomware is malicious software that encrypts a victim’s data so they cannot gain access to it on their computers, then offers to unlock the system in exchange for payment.

Friday’s FBI alert was focused on ransomware known as MSIL/Samas.A that the agency said seeks to encrypt data on entire networks, an alarming change because typically, ransomware has sought to encrypt data one computer at a time.

The plea asked recipients to immediately contact the FBI’s CYWATCH cyber center if they find evidence that they have been attacked or have other information that might help in its investigation.

It is the latest in a series of FBI advisories and warnings from security researchers about new ransomware tools and techniques.

“This is basically becoming a national cyber emergency,” said Ben Johnson, co-founder of Carbon Black, a cyber security firm that on Friday uncovered another type of ransomware that seeks to attack PCs through infected Microsoft Word documents.

The FBI first reported on MSIL/Samas.A in a Feb. 18 alert that lacked the urgency of Friday’s warning. The February message contained some technicals details but did not call for help. It said that MSIL/Samas.A targets servers running out-of-date versions of a type of business software known as JBOSS.

In its latest report, the FBI said that investigators have since found that hackers are using a software tool dubbed JexBoss to automate discovery of vulnerable JBOSS systems and launch attacks, allowing them to remotely install ransomware on computers across the network.

The FBI provided a list of technical indicators to help companies determine if they were victims of such an attack.

“The FBI is distributing these indicators to enable network defense activities and reduce the risk of similar attacks in the future,” the advisory said.

FBI representatives did not respond to requests for comment on the confidential warning.

The sectors hardest hit by ransomware include industries that rely on computer access for performing critical functions, such as healthcare and law enforcement. Publicly reported attacks in which hospitals and police have paid ransoms, then recovered data, has encouraged attackers to further target those groups, cyber security experts said.

(Reporting by Jim Finkle; editing by Grant McCool)

Chinese hackers behind U.S. ransomware attacks, security firms say

(Reuters) – Hackers using tactics and tools previously associated with Chinese government-supported computer network intrusions have joined the booming cyber crime industry of ransomware, four security firms that investigated attacks on U.S. companies said.

Ransomware, which involves encrypting a target’s computer files and then demanding payment to unlock them, has generally been considered the domain of run-of-the-mill cyber criminals.

But executives of the security firms have seen a level of sophistication in at least a half dozen cases over the last three months akin to those used in state-sponsored attacks, including techniques to gain entry and move around the networks, as well as the software used to manage intrusions.

“It is obviously a group of skilled of operators that have some amount of experience conducting intrusions,” said Phil Burdette, who heads an incident response team at Dell SecureWorks.

Burdette said his team was called in on three cases in as many months where hackers spread ransomware after exploiting known vulnerabilities in application servers. From there, the hackers tricked more than 100 computers in each of the companies into installing the malicious programs.

The victims included a transportation company and a technology firm that had 30 percent of its machines captured.

Security firms Attack Research, InGuardians and G-C Partners, said they had separately investigated three other similar ransomware attacks since December.

Although they cannot be positive, the companies concluded that all were the work of a known advanced threat group from China, Attack Research Chief Executive Val Smith told Reuters.

The ransomware attacks have not previously been reported. None of the companies that were victims of the hackers agreed to be identified publicly.

Asked about the allegations, China’s Foreign Ministry said on Tuesday that if they were made with a “serious attitude” and reliable proof, China would treat the matter seriously.

But ministry spokesman Lu Kang said China did not have time to respond to what he called “rumors and speculation” about the country’s online activities.

The security companies investigating the advanced ransomware intrusions have various theories about what is behind them, but they do not have proof and they have not come to any firm conclusions.

Most of the theories flow from the possibility that the Chinese government has reduced its support for economic espionage, which it pledged to oppose in an agreement with the United States late last year. Some U.S. companies have reported a decline in Chinese hacking since the agreement.

Smith said some government hackers or contractors could be out of work or with reduced work and looking to supplement their income via ransomware.

It is also possible, Burdette said, that companies which had been penetrated for trade secrets or other reasons in the past were now being abandoned as China backs away, and that spies or their associates were taking as much as they could on the way out. In one of Dell’s cases, the means of access by the team spreading ransomware was established in 2013.

The cyber security experts could not completely rule out more prosaic explanations, such as the possibility that ordinary criminals had improved their skills and bought tools previously used only by governments.

Dell said that some of the malicious software had been associated by other security firms with a group dubbed Codoso, which has a record of years of attacks of interest to the Chinese government, including those on U.S. defense companies and sites that draw Chinese minorities.

PAYMENT IN BITCOIN

Ransomware has been around for years, spread by some of the same people that previously installed fake antivirus programs on home computers and badgered the victims into paying to remove imaginary threats.

In the past two years, better encryption techniques have often made it impossible for victims to regain access to their files without cooperation from the hackers. Many ransomware payments are made in the virtual currency Bitcoin and remain secret, but institutions including a Los Angeles hospital have gone public about ransomware attacks.

Ransomware operators generally set modest prices that many victims are willing to pay, and they usually do decrypt the files, which ensures that victims will post positively online about the transaction, making the next victims who research their predicament more willing to pay.

Security software companies have warned that because the aggregate payoffs for ransomware gangs are increasing, more criminals will shift to it from credit card theft and other complicated scams.

The involvement of more sophisticated hackers also promises to intensify the threat.

InGuardians CEO Jimmy Alderson said one of the cases his company investigated appeared to have been launched with online credentials stolen six months earlier in a suspected espionage hack of the sort typically called an Advanced Persistent Threat, or APT.

“The tactics of getting access to these networks are APT tactics, but instead of going further in to sit and listen stealthily, they are used for smash-and-grab,” Alderson said.

(Reporting by Joseph Menn in San Francisco; Additional reporting by Megha Rajagopalan in Beijing; Editing by Jonathan Weber and Clarence Fernandez)

Mac ransomware caught before large number of computers infected

(Reuters) – The first known ransomware attack on Apple Inc’s Mac computers, which was discovered over the weekend, was downloaded more than 6,000 times before the threat was contained, according to a developer whose product was tainted with the malicious software.

Hackers infected Macs with the “KeRanger” ransomware through a tainted copy of Transmission, a popular program for transferring data through the BitTorrent peer-to-peer file sharing network.

So-called ransomware is a type of malicious software that restricts access to a computer system in some way and demands the user pay a ransom to the malware operators to remove the restriction.

KeRanger, which locks data on Macs so users cannot access it, was downloaded about 6,500 times before Apple and developers were able to thwart the threat, said John Clay, a representative for the open-source Transmission project.

That is small compared to the number of ransomware attacks on computers running Microsoft Corp’s Windows operating system. Cyber security firm Symantec Corp observed some 8.8 million attacks in 2014 alone.

Still, cyber security experts said they expect to see more attacks on Macs as the KeRanger hackers and other groups look for new ways to infect Mac computers.

“It’s a small number but these things always start small and ramp up huge,” said Fidelis Cybersecurity threat systems manager John Bambenek. “There’s a lot of Mac users out there and a lot of money to be made.”

Symantec, which sells anti-virus software for Macs, warned on its blog that “Mac users should not be complacent.” The post offered tips on protecting against ransomware.

The Transmission project provided few details about how the attack was launched.

“The normal disk image (was) replaced by the compromised one” after the project’s main server was hacked, said Clay.

He added that “security on the server has since been increased” and that the group was in “frequent contact” with Apple as well as Palo Alto Networks, which discovered the ransomware on Friday and immediately notified Apple and Transmission.

An Apple representative said the company quickly took steps over the weekend to prevent further infections by revoking a digital certificate that enabled the rogue software to install on Macs.

Transmission responded by removing the malicious 2.90 version of its software from its website. On Sunday, it released version 2.92, which its website says automatically removes the ransomware from infected Macs.

Forbes earlier reported on the number of KeRanger downloads, citing Clay.

(Reporting by Jim Finkle; Editing by Cynthia Osterman and Bill Rigby)

Apple users targeted in first known Mac ransomware campaign

BOSTON (Reuters) – Apple Inc customers were targeted by hackers over the weekend in the first campaign against Macintosh computers using a pernicious type of software known as ransomware, researchers with Palo Alto Networks Inc told Reuters on Sunday.

Ransomware, one of the fastest-growing types of cyber threats, encrypts data on infected machines, then typically asks users to pay ransoms in hard-to-trace digital currencies to get an electronic key so they can retrieve their data.

Security experts estimate that ransoms total hundreds of millions of dollars a year from such cyber criminals, who typically target users of Microsoft Corp’s Windows operating system.

Palo Alto Threat Intelligence Director Ryan Olson said the “KeRanger” malware, which appeared on Friday, was the first functioning ransomware attacking Apple’s Mac computers.

“This is the first one in the wild that is definitely functional, encrypts your files and seeks a ransom,” Olson said in a telephone interview.

Hackers infected Macs through a tainted copy of a popular program known as Transmission, which is used to transfer data through the BitTorrent peer-to-peer file sharing network, Palo Alto said on a blog posted on Sunday afternoon.

When users downloaded version 2.90 of Transmission, which was released on Friday, their Macs were infected with the ransomware, the blog said.

An Apple representative said the company had taken steps over the weekend to prevent further infections by revoking a digital certificate that enabled the rogue software to install on Macs. The representative declined to provide other details.

Transmission responded by removing the malicious version of its software from its website. On Sunday it released a version that its website said automatically removes the ransomware from infected Macs.

The website advised Transmission users to immediately install the new update, version 2.92, if they suspected they might be infected.

Palo Alto said on its blog that KeRanger is programmed to stay quiet for three days after infecting a computer, then connect to the attacker’s server and start encrypting files so they cannot be accessed.

After encryption is completed, KeRanger demands a ransom of 1 bitcoin, or about $400, the blog said.

Olson, the Palo Alto threat intelligence director, said that the victims whose machines were compromised but not cleaned up could start losing access to data on Monday, which is three days after the virus was loaded onto Transmission’s site.

Representatives with Transmission could not be reached for comment.

(Editing by Jeffrey Benkoe and Sandra Maler)