Tag Archives: Hackers

Russian spies hack U.S. Democratic Party computers

A woman is silhouetted during the DNC Rules and Bylaws Committee meeting in Washington

WASHINGTON (Reuters) – Russian government hackers penetrated the computer network of the Democratic National Committee and gained access to the entire database of opposition research on Republican presidential candidate Donald Trump, the Washington Post reported on Tuesday.

“The intruders so thoroughly compromised the DNC’s system they also were able to read all e-mail and chat traffic,” the paper said, citing committee officials and security experts.

Representative Debbie Wasserman Schultz, chairwoman of the Democratic National Committee, confirmed the breach.

“When we discovered the intrusion, we treated this like the serious incident it is …,” Wasserman Schultz said in a statement. “Our team moved as quickly as possible to kick out the intruders and secure our network.”

The Post quoted U.S. officials as saying Russian spies also targeted the networks of Trump and Democratic presidential candidate Hillary Clinton, as well as computers of some Republican political action committees.

It said some of the hackers had access to the Democratic National Committee network for about a year “but all were expelled over the past weekend in a major computer clean-up campaign.”

(Reporting by Susan Heavey; Writing by Mohammad Zargham; Editing by James Dalgleish)

Fed records show dozens of cybersecurity breaches

The Federal Reserve building in Washington

By Jason Lange and Dustin Volz

WASHINGTON (Reuters) – The U.S. Federal Reserve detected more than 50 cyber breaches between 2011 and 2015, with several incidents described internally as “espionage,” according to Fed records.

The central bank’s staff suspected hackers or spies in many of the incidents, the records show. The Fed’s computer systems play a critical role in global banking and hold confidential information on discussions about monetary policy that drives financial markets.

The cybersecurity reports, obtained by Reuters through a Freedom of Information Act request, were heavily redacted by Fed officials to keep secret the central bank’s security procedures.

The Fed declined to comment, and the redacted records do not say who hacked the bank’s systems or whether they accessed sensitive information or stole money.

“Hacking is a major threat to the stability of the financial system. This data shows why,” said James Lewis, a cybersecurity expert at the Center for Strategic and International Studies, a Washington think tank. Lewis reviewed the files at the request of Reuters.

For a graphic on the Fed security breaches, see: http://tmsnrt.rs/1TxSu8R

The records represent only a slice of all cyber attacks on the Fed because they include only cases involving the Washington-based Board of Governors, a federal agency that is subject to public records laws. Reuters did not have access to reports by local cybersecurity teams at the central bank’s 12 privately owned regional branches.

The disclosure of breaches at the Fed comes at a time when cybersecurity at central banks worldwide is under scrutiny after hackers stole $81 million from a Bank Bangladesh account at the New York Fed.

Cyber thieves have targeted large financial institutions around the world, including America’s largest bank JPMorgan, as well as smaller players like Ecuador’s Banco del Austro and Vietnam’s Tien Phong Bank.

Hacking attempts were cited in 140 of the 310 reports provided by the Fed’s board. In some reports, the incidents were not classified in any way.

In eight information breaches between 2011 and 2013 – a time when the Fed’s trading desk was buying massive amounts of bonds – Fed staff wrote that the cases involved “malicious code,” referring to software used by hackers.

Four hacking incidents in 2012 were considered acts of “espionage,” according to the records. Information was disclosed in at least two of those incidents, according to the records. In the other two incidents, the records did not indicate whether there was a breach.

In all, the Fed’s national team of cybersecurity experts, which operates mostly out of New Jersey, identified 51 cases of “information disclosure” involving the Fed’s board. Separate reports showed a local team at the board registered four such incidents.

The cases of information disclosure can refer to a range of ways unauthorized people see Fed information, from hacking attacks to Fed emails sent to the wrong recipients, according to two former Fed cybersecurity staffers who spoke on condition of anonymity.

The former employees said that cyber attacks on the Fed are about as common as at other large financial institutions.

It was unclear if the espionage incidents involved foreign governments, as has been suspected in some hacks of federal agencies. Beginning in 2014, for instance, hackers stole more than 21 million background check records from the federal Office of Personnel Management, and U.S. officials attributed the breach to the Chinese government, an accusation denied by Beijing.

TARGET FOR SPYING

Security analysts said foreign governments could stand to gain from inside Fed information. China and Russia, for instance, are major players in the $13.8 trillion federal debt market where Fed policy plays a big role in setting interest rates.

“Obviously that makes it a very clear (hacking) target for other nation states,” said Ari Schwartz, a former top cybersecurity adviser at the White House who is now with the law firm Venable.

U.S. prosecutors in March accused hackers associated with Iran’s government of attacking dozens of U.S. banks.

In the records obtained by Reuters, espionage might also refer to spying by private companies, or even individuals such British activist Lauri Love, who is accused of infiltrating a server at a regional Fed branch in October 2012. Love stole names, e-mail addresses, and phone numbers of Fed computer system users, according to a federal indictment.

The redacted reports obtained by Reuters do not mention Love or any other hacker by name.

The records point to breaches during a sensitive period for the Fed, which was ramping up aid for the struggling U.S. economy by buying massive quantities of U.S. government debt and mortgage-backed securities.

In 2010 and 2011, the Fed went on a $600 billion bond-buying spree that lowered interest rates and made bonds more expensive. It restarted purchases in September 2012 and expanded them up in December of that year.

The Fed cybersecurity records did not indicate whether hackers accessed sensitive information on the timing or amounts of bond purchases or used it for financial gain.

UP ALL NIGHT

The Fed’s national cybersecurity team – the National Incident Response Team, or NIRT – created 263 of the incident reports obtained by Reuters.

NIRT operates in a fortress-like building in East Rutherford, New Jersey that also processes millions of dollars in cash everyday as part of the central bank’s duty to keep the financial system running, according to the New York Fed’s website. The unit provides support to the local cybersecurity teams at the Fed’s Board and regional banks, which process more than $3 trillion in payments every day.

The NIRT handles “higher impact” cases, according to a 2013 report by the Board of Governor’s Office of Inspector General.

One of the two former NIRT employees interviewed by Reuters described being on a team that once worked around the clock for five-straight days to patch software hackers had used to gain access to Fed systems in an attempt to obtain passwords. The former employee worked through several of those nights, taking naps at a desk in the office.

In that case, Fed security staff found no signs that sensitive information had been disclosed, the former employee said. Information about future interest rate policy discussions is isolated from other Fed networks and is more difficult for hackers to access, the former NIRT worker said.

But the Fed was under constant assault, much like any large company, the former employee said, and was “compromised frequently.”

An internal watchdog has criticized the central bank for cybersecurity shortcomings. A 2015 audit by the Fed board’s Office of Inspector General found the board was not adequately scanning databases for vulnerabilities or putting enough restrictions on system access.

“There is heightened risk of unauthorized disclosure and inappropriate use of sensitive board information,” according to the audit released in November.

(Reporting by Jason Lange and Dustin Volz; Editing by David Chance and Brian Thevenot)

U.S., China cyber group holds first talks since September pact

Hands on Keyboard

WASHINGTON (Reuters) – A group of senior U.S. and China cyber officials on Wednesday held its first meeting since the two countries struck an anti-hacking agreement in September to try to ease years of acrimony over the issue.

The so-called Senior Experts Group on International Norms and Related Issues is expected to gather twice a year, the U.S. State Department said in a statement announcing the meeting.

It provided scant information about the talks, saying officials from the two nations’ foreign, defense and other ministries discussed “international norms of state behavior and other crucial issues for international security in cyberspace.”

China’s foreign ministry, in a brief statement, said the two sides had a “positive, deep and constructive” discussion about issues including international law as it relates to the Internet and trust measures.

China and the United States will hold another meeting at an appropriate time within the next six months, it added.

China withdrew in 2014 from a separate bilateral cyber working group following the U.S. indictment of five members of its military on charges it hacked six U.S. companies. The new group appears be a fresh start to grapple with cyber issues.

Cyber security has long been an irritant in relations between China and the United States, despite robust economic ties worth nearly $600 billion in two-way trade last year.

The September pact, reached during a U.S. visit by Chinese President Xi Jinping, included a pledge that neither country would knowingly carry out hacking for commercial advantage.

(Reporting by Arshad Mohammed; Additional reporting by Ben Blanchard in Beijing; Editing by Peter Cooney)

Big Breeches found at major email services

A magnifying glass is held in front of a computer screen in this picture illustration taken in Berlin

By Eric Auchard

FRANKFURT (Reuters) a security expert told Reuters.

The discovery of 272.3 million stolen accounts included a majority of users of Mail.r, MAILRq, Russia’s most popular email service, and smaller fractions of Google GO, Yahoo YHOO.O and Microsoft email users, said Alex Holden, founder and chief information security officer of Hold Security.

It is one of the biggest stashes of stolen credentials to be uncovered since cyber attacks hit major U.S. banks and retailers two years ago.

Holden was previously instrumental in uncovering some of the world’s biggest known data breaches, affecting tens of millions of users at Adobe Systems, ADBE., JPMorgan JPM and Target and exposing them to subsequent cyber crimes.

The latest discovery came after Hold Security researchers found a young Russian hacker bragging in an online forum that he had collected and was ready to give away a far larger number of stolen credentials that ended up totaling 1.17 billion records.

After eliminating duplicates, Holden said, the cache contained nearly 57 million Mail.ru accounts – a big chunk of the 64 million monthly active email users Mail.ru said it had at the end of last year. It also included tens of millions of credentials for the world’s three big email providers, Gmail, Microsoft and Yahoo, plus hundreds of thousands of accounts at German and Chinese email providers.

“This information is potent. It is floating around in the underground and this person has shown he’s willing to give the data away to people who are nice to him,” said Holden, the former chief security officer at U.S. brokerage R.W. Baird. “These credentials can be abused multiple times,” he said.

LESS THAN $1

Mysteriously, the hacker asked just 50 rubles – less than $1 – for the entire trove, but gave up the dataset after Hold researchers agreed to post favorable comments about him in hacker forums, Holden said. He said his company’s policy is to refuse to pay for stolen data.

Such large-scale data breaches can be used to engineer further break-ins or phishing attacks by reaching the universe of contacts tied to each compromised account, multiplying the risks of financial theft or reputational damage across the web.

Hackers know users cling to favorite passwords, resisting admonitions to change credentials regularly and make them more complex. It’s why attackers reuse old passwords found on one account to try to break into other accounts of the same user.

After being informed of the potential breach of email credentials, Mail.ru spokeswoman Madina Tayupova told Reuters: “We are now checking, whether any combinations of usernames/passwords match users’ e-mails and are still active.

“As soon as we have enough information we will warn the users who might have been affected,” she said, adding that Mail.ru’s initial checks found no live combinations of usernames and passwords which match existing emails.

A Microsoft spokesman said stolen online credentials was an unfortunate reality. “Microsoft has security measures in place to detect account compromise and requires additional information to verify the account owner and help them regain sole access.”

Yahoo and Google did not respond to requests for comment.

Yahoo Mail credentials numbered 40 million, or 15 percent of the 272 million unique IDs discovered. Meanwhile, 33 million, or 12 percent, were Microsoft Hotmail accounts and 9 percent, or nearly 24 million, were Gmail, according to Holden.

Thousands of other stolen username/password combinations appear to belong to employees of some of the largest U.S. banking, manufacturing and retail companies, he said.

Stolen online account credentials are to blame for 22 percent of big data breaches, according to a recent survey of 325 computer professionals by the Cloud Security Alliance.

In 2014, Holden, a Ukrainian-American who specializes in Eastern European cyber crime threats, uncovered a cache of 1.2 billion unique credentials that marked the world’s biggest-ever recovery of stolen accounts.

His firm studies cyber threats playing out in the forums and chatrooms that make up the criminal underground, speaking to hackers in their native languages while developing profiles of individual criminals.

Holden said efforts to identify the hacker spreading the current trove of data or the source or sources of the stolen accounts would have exposed the investigative methods of his researchers. Because the hacker vacuumed up data from many sources, researchers have dubbed him “The Collector”.

Ten days ago, Milwaukee-based Hold Security began informing organizations affected by the latest data breaches. The company’s policy is to return data it recovers at little or no cost to firms found to have been breached.

“This is stolen data, which is not ours to sell,” said Holden.

(Editing by Mark Trevelyan)

Trail in cyber heist suggests hackers were Chinese: senator

Bangladesh central bank

By Karen Lema

MANILA (Reuters) – A Philippine senator said on Wednesday that Chinese hackers were likely to have pulled off one of the world’s biggest cyber heists at the Bangladesh central bank, citing the network of Chinese people involved in the routing of the stolen funds through Manila.

Unidentified hackers infiltrated the computers at Bangladesh Bank in early February and tried to transfer a total of $951 million from its account at the Federal Reserve Bank of New York.

All but one of the 35 attempted transfers were to the Rizal Commercial Banking Corp (RCBC), confirming the Philippines’ centrality to the heist.

Most transfers were blocked, but a total of $81 million went to four accounts at a single RCBC branch in Manila. The stolen money was swiftly transferred to a foreign exchange broker and distributed to casinos and gambling agents in Manila.

“The hacking was done, chances are, by Chinese hackers,” Senator Ralph Recto told Reuters in a telephone interview. “Then they saw that, in the Philippines, RCBC particularly was vulnerable and sent the money over here.”

Beijing was quick to denounce the comments by Recto, vice chairman of the Senate Committee on Finance and a former head of the Philippines’ economic planning agency.

The suggestion that Chinese hackers were possibly involved was “complete nonsense” and “really irresponsible,” Chinese foreign ministry spokesman Lu Kang told reporters.

Recto said he couldn’t prove the hackers were Chinese, but was merely “connecting the dots” after a series of Senate hearings into the scandal.

At one hearing, a Chinese casino boss and junket operator called Kim Wong named two high-rolling gamblers from Beijing and Macau who he said had brought the stolen money into the Philippines. He displayed purported copies of their passports, showing they were mainland Chinese and Macau administrative region nationals respectively.

“BEST LEAD”

Wong, a native of Hong Kong who holds a Chinese passport, received almost $35 million of the stolen funds through his company and a foreign exchange broker.

The two Chinese named by Wong “are the best lead to determine who are the hackers,” said Recto. “Chances are… they must be Chinese.”

The whereabouts of the two high-rollers were unknown, Recto added, saying the Senate inquiry “may” seek help from the Chinese government to find them.

Recto also questioned the role of casino junket operators in the Philippines, saying many of them have links in Macau, the southern Chinese territory that is the world’s biggest casino hub. “There are junket operators who are from Macau, so it (the money) may find its way back to Macau,” he said.

A senior executive at a top junket operator in Macau told Reuters there was “no reason” to bring funds from the Philippines to Macau.

“This seems more like a political story in the Philippines,” he said, speaking anonymously because he was not authorized to talk to the media.

The U.S. State Department said in a report last month that the gaming industry was “a weak link” in the Philippines’ anti-money laundering regime.

Philrem, the foreign exchange agent, said it distributed the stolen $81 million to Bloomberry Resorts Corp, which owns and operates the upmarket Solaire casino in Manila; to Eastern Hawaii Leisure Company, which is owned by Wong; and to an ethnic Chinese man believed to be a junket operator in Manila.

Wong has returned $5.5 million to the Philippines’ anti-money laundering agency and has promised to hand over another $9.7 million. A portion of the money he received, he said, has already been spent on gambling chips for clients.

Solaire has told the Senate hearing that the $29 million that ended up with them was credited to an account of the Macau-based high-roller but it has managed to seize and confiscate $2.33 million in chips and cash.

(Writing by Andrew R.C. Marshall; Additional reporting by Farah Master in Hong Kong; Editing by Raju Gopalakrishnan)

U.S. to charge Iranians in cyber attacks, including New York dam

WASHINGTON (Reuters) – The Obama administration is expected to blame Iranian hackers as soon as Thursday for a coordinated campaign of cyber attacks in 2012 and 2013 on a suburban New York City dam and several other targets, sources familiar with the matter have told Reuters.

In one of the largest foreign cyber attack cases since 2014 when the United States charged five Chinese military hackers, the U.S. Justice Department has prepared an indictment against about a half-dozen Iranians, said four sources, who spoke on condition of anonymity due to the sensitivity of the matter.

The charges, related to unlawful access to computers and other alleged crimes, were expected to be announced publicly by U.S. officials as soon as Thursday morning at a news conference in Washington, the sources said.

The indictment was expected to directly link the hacking campaign to the Iranian government, one source said.

Though the breach of back-office computer systems at the Bowman Avenue Dam in Rye Brook, New York has been reported, it was only part of a hacking campaign that was broader than previously known, as the indictment will show, the sources said.

In the intrusion of the dam computers, the hackers did not gain operational control of the floodgates, and investigators believe they were attempting to test their capabilities.

The dam breach coincided roughly with attacks on U.S. financial institutions. Cyber security experts have said these, too, were perpetrated by Iranian hackers against Capital One, PNC Financial Services and SunTrust Bank. Prosecutors were considering including those breaches in the indictment, sources said.

The hackers who were expected to be named in the indictment all reside in Iran, one source said.

The Justice Department declined to comment.

The indictment would be the Obama administration’s latest step to confront foreign cyber attacks on the United States. President Barack Obama accused and publicly condemned North Korea over a 2014 hack on Sony Pictures and vowed to “respond proportionally.” No details were made public of any retaliation.

James Lewis, a cyber security expert with the Center for Strategic and International Studies think tank, said, “We need to make clear that there will be consequences for cyber-attacks and that the Wild West days are coming to an end.”

Two weeks ago, it was widely reported that U.S. prosecutors were preparing an indictment against Iranian hackers related solely to the dam attack.

The broader indictment would come at a time of reduced tensions between the United States and Iran after a landmark 2015 nuclear deal. At the same time, the Obama administration has shown a willingness to confront Tehran for bad behavior.

Charging the Iranian hackers would be the highest-profile move of its type by the Obama administration since the Justice Department in 2014 accused five members of China’s People’s Liberation Army with hacking several Pennsylvania-based companies in an alleged effort to steal trade secrets.

(Reporting by Dustin Volz in Washington and Nate Raymond in New York; additional reporting by Mark Hosenball in Washington and Jim Finkle in Boston; Editing by Kevin Drawbaugh and Jonathan Oatis)

Number of U.S. government ‘cyber incidents’ jumps in 2015

WASHINGTON (Reuters) – The U.S. government was hit by more than 77,000 “cyber incidents” like data thefts or other security breaches in fiscal year 2015, a 10 percent increase over the previous year, according to a White House audit.

Part of the uptick stems from federal agencies improving their ability to identify and detect incidents, the annual performance review from the Office and Management and Budget said.

The report, released on Friday, defines cyber incidents broadly as “a violation or imminent threat of violation of computer security policies, acceptable use policies, or standard computer security practices.” Only a small number of the incidents would be considered as significant data breaches.

National security and intelligence officials have long warned that cyber attacks are among the most serious threats facing the United States. President Barack Obama asked Congress last month for $19 billion for cyber security funding across the government in his annual budget request, an increase of $5 billion over the previous year.

The government’s Office of Personnel Management was victim of a massive hack that began in 2014 and was detected last year. Some 22 million current and former federal employees and contractors in addition to family members had their Social Security numbers, birthdays, addresses and other personal data pilfered in the breach.

That event prompted the government to launch a 30-day “cyber security sprint” to boost cyber security within each federal agency by encouraging adoption of multiple-factor authentication and addressing other vulnerabilities.

“Despite unprecedented improvements in securing federal information resources … malicious actors continue to gain unauthorized access to, and compromise, federal networks, information systems, and data,” the report said.

(Reporting by Dustin Volz; Editing by Alistair Bell)

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)

North Korea tried to hack South’s railway system, spy agency claims

SEOUL (Reuters) – North Korea has tried to hack into email accounts of South Korean railway workers in an attempt to attack the transport system’s control system, South Korea’s spy agency said on Tuesday.

South Korea has been on heightened alert against the threat of cyberattacks by North Korea after it conducted a nuclear test in January and a long-range rocket launch last month, triggering new U.N. sanctions.

South Korea had previously blamed the North for cyberattacks against its nuclear power operator. North Korea denied that.

South Korea’s National Intelligence Service (NIS) said in a statement it had interrupted the hacking attempt against the railway workers and closed off their email accounts.

The agency issued the statement after an emergency meeting with other government agencies on the threat of cyberattacks by the North.

The agency detected hacking attempts by the North against workers for two regional railway networks this year, the spy agency said.

“The move was a step to prepare for cyber terror against the railway transport control system,” the agency said.

It did not elaborate on what it thought North Korea’s specific objective was in hacking into the system. An agency official reached by telephone declined to comment.

North Korea has been working for years to develop the ability to disrupt or destroy computer systems that control public services such as telecommunications and other utilities, according to a defector from the North.

The United States accused North Korea of a cyberattack against Sony Pictures in 2014 that led to the studio cancelling the release of a comedy based on the fictional assassination of the country’s leader, Kim Jong Un.

North Korea denied the accusation.

In 2013, South Korea blamed the North for crippling cyber-attacks that froze the computer systems of its banks and broadcasters for days.

New fears of attacks on South Korea’s computer systems came as South Korean and U.S. troops conducted large-scale military exercises which North Korea denounced as “nuclear war moves” and threatened to respond with an all-out military offensive.

(Reporting by Jack Kim and Ju-min Park; Editing by Robert Birsel)

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)