Payment Processing Giant TSYS: Ransomware Incident “Immaterial” to Company

December 10, 2020
19 Comments

Payment card processing giant TSYS suffered a ransomware attack earlier this month. Since then reams of data stolen from the company have been posted online, with the attackers promising to publish more in the coming days. But the company says the malware did not jeopardize card data, and that the incident was limited to administrative areas of its business.

Headquartered in Columbus, Ga., Total System Services Inc. (TSYS) is the third-largest third-party payment processor for financial institutions in North America, and a major processor in Europe.

TSYS provides payment processing services, merchant services and other payment solutions, including prepaid debit cards and payroll cards. In 2019, TSYS was acquired by financial services firm Global Payments Inc. [NYSE:GPN].

On December 8, the cybercriminal gang responsible for deploying the Conti ransomware strain (also known as “Ryuk“) published more than 10 gigabytes of data that it claimed to have removed from TSYS’s networks.

Conti is one of several cybercriminal groups that maintains a blog which publishes data stolen from victims in a bid to force the negotiation of ransom payments. The gang claims the data published so far represents just 15 percent of the information it offloaded from TSYS before detonating its ransomware inside the company.

In a written response to requests for comment, TSYS said the attack did not affect systems that handle payment card processing.

“We experienced a ransomware attack involving systems that support certain corporate back office functions of a legacy TSYS merchant business,” TSYS said. “We immediately contained the suspicious activity and the business is operating normally.” Continue reading →

Patch Tuesday, Good Riddance 2020 Edition

December 8, 2020
29 Comments

Microsoft today issued its final batch of security updates for Windows PCs in 2020, ending the year with a relatively light patch load. Nine of the 58 security vulnerabilities addressed this month earned Microsoft’s most-dire “critical” label, meaning they can be abused by malware or miscreants to seize remote control over PCs without any help from users.

Mercifully, it does not appear that any of the flaws fixed this month are being actively exploited, nor have any them been detailed publicly prior to today.

The critical bits reside in updates for Microsoft Exchange Server, Sharepoint Server, and Windows 10 and Server 2016 systems. Additionally, Microsoft released an advisory on how to minimize the risk from a DNS spoofing weakness in Windows Server 2008 through 2019.

Some of the sub-critical “important” flaws addressed this month also probably deserve prompt patching in enterprise environments, including a trio of updates tackling security issues with Microsoft Office.

“Given the speed with which attackers often weaponize Microsoft Office vulnerabilities, these should be prioritized in patching,” said Allan Liska, senior security architect at Recorded Future. “The vulnerabilities, if exploited, would allow an attacker to execute arbitrary code on a victim’s machine. These vulnerabilities affect Microsoft Excel 2013 through 2019, Microsoft 365 32 and 64 bit versions, Microsoft Office 2019 32 and 64 bit versions, and Microsoft Excel for Mac 2019.”

We also learned this week that Redmond quietly addressed a scary “zero-click” vulnerability in its Microsoft Teams platform that would have let anyone execute code of their choosing just by sending the target a specially-crafted chat message to a Teams users. The bug was cross-platform, meaning it could also have been used to deliver malicious code to people using Teams on non-Windows devices. Continue reading →

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IRS to Make ID Protection PIN Open to All

December 4, 2020
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The U.S. Internal Revenue Service (IRS) said this week that beginning in 2021 it will allow all taxpayers to apply for an identity protection personal identification number (IP PIN), a single-use code designed to block identity thieves from falsely claiming a tax refund in your name. Currently, IP PINs are issued only to those who fill out an ID theft affidavit, or to taxpayers who’ve experienced tax refund fraud in previous years.

Tax refund fraud is a perennial problem involving the use of identity information and often stolen or misdirected W-2 forms to electronically file an unauthorized tax return for the purposes of claiming a refund in the name of a taxpayer.

Victims usually first learn of the crime after having their returns rejected because scammers beat them to it. Even those who are not required to file a return can be victims of refund fraud, as can those who are not actually due a refund from the IRS.  

Many of the reasons why refund fraud remains a problem have to do with timing, and some of them are described in more detail here. But the short answer is the IRS is under tremendous pressure to issue refunds quickly and to minimize “false positives” (flagging legitimate claims as fraud) — even when it may not yet have all of the information needed to accurately distinguish phony filings from legitimate ones. Continue reading →

Account Hijacking Site OGUsers Hacked, Again

December 2, 2020
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For at least the third time in its existence, OGUsers — a forum overrun with people looking to buy, sell and trade access to compromised social media accounts — has been hacked.

An offer by the apparent hackers of OGUsers, offering to remove account information from the eventual database leak in exchange for payment.

Roughly a week ago, the OGUsers homepage was defaced with a message stating the forum’s user database had been compromised. The hack was acknowledged by the forum’s current administrator, who assured members that their passwords were protected with a password obfuscation technology that was extremely difficult to crack.

But unlike in previous breaches at OGUsers, the perpetrators of this latest incident have not yet released the forum database. In the meantime, someone has been taunting forum members, saying they can have their profiles and private messages removed from an impending database leak by paying between $50 and $100.

OGUsers was hacked at least twice previously, in May 2019 and again in March 2020. In the wake of both incidents, the compromised OGUsers databases were made available for public download. Continue reading →

Bomb Threat, DDoS Purveyor Gets Eight Years

December 1, 2020
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A 22-year-old North Carolina man has been sentenced to nearly eight years in prison for conducting bomb threats against thousands of schools in the U.S. and United Kingdom, running a service that launched distributed denial-of-service (DDoS) attacks, and for possessing sexually explicit images of minors.

Timothy Dalton Vaughn from Winston-Salem, N.C. was a key member of the Apophis Squad, a gang of young ne’er-do-wells who made bomb threats to more than 2,400 schools and launched DDoS attacks against countless Web sites — including KrebsOnSecurity on multiple occasions.

The Justice Department says Vaughn and his gang ran a DDoS-for-hire service that they used to shake down victims.

“In early 2018, Vaughn demanded 1.5 bitcoin (then worth approximately $20,000) from a Long Beach company, to prevent denial-of-service attacks on its website,” reads a statement from Nicola Hanna, U.S. attorney for the Central District of California. “When the company refused to pay, he launched a DDoS attack that disabled the company’s website.”

One of many tweets from the attention-starved Apophis Squad, which launched multiple DDoS attacks against KrebsOnSecurity over the past few months.

Dalton, whose online aliases included “WantedbyFeds” and “Hacker_R_US,” pleaded guilty last year to one count of conspiracy to convey threats to injure, convey false information concerning use of explosive device, and intentionally damage a computer; one count of computer hacking; and one count of possession of child pornography.

Federal judge Otis D. Wright II sentenced Vaughn to 95 months for possessing 200 sexually explicit images and videos depicting children, including at least one toddler, the Justice Department said. Vaughn was sentenced to 60 months in federal prison for the remaining charge. The sentences will be served concurrently. Continue reading →

GoDaddy Employees Used in Attacks on Multiple Cryptocurrency Services

November 21, 2020
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Fraudsters redirected email and web traffic destined for several cryptocurrency trading platforms over the past week. The attacks were facilitated by scams targeting employees at GoDaddy, the world’s largest domain name registrar, KrebsOnSecurity has learned.

The incident is the latest incursion at GoDaddy that relied on tricking employees into transferring ownership and/or control over targeted domains to fraudsters. In March, a voice phishing scam targeting GoDaddy support employees allowed attackers to assume control over at least a half-dozen domain names, including transaction brokering site escrow.com.

And in May of this year, GoDaddy disclosed that 28,000 of its customers’ web hosting accounts were compromised following a security incident in Oct. 2019 that wasn’t discovered until April 2020.

This latest campaign appears to have begun on or around Nov. 13, with an attack on cryptocurrency trading platform liquid.com.

“A domain hosting provider ‘GoDaddy’ that manages one of our core domain names incorrectly transferred control of the account and domain to a malicious actor,” Liquid CEO Mike Kayamori said in a blog post. “This gave the actor the ability to change DNS records and in turn, take control of a number of internal email accounts. In due course, the malicious actor was able to partially compromise our infrastructure, and gain access to document storage.”

In the early morning hours of Nov. 18 Central European Time (CET), cyptocurrency mining service NiceHash disccovered that some of the settings for its domain registration records at GoDaddy were changed without authorization, briefly redirecting email and web traffic for the site. NiceHash froze all customer funds for roughly 24 hours until it was able to verify that its domain settings had been changed back to their original settings.

“At this moment in time, it looks like no emails, passwords, or any personal data were accessed, but we do suggest resetting your password and activate 2FA security,” the company wrote in a blog post.

NiceHash founder Matjaz Skorjanc said the unauthorized changes were made from an Internet address at GoDaddy, and that the attackers tried to use their access to its incoming NiceHash emails to perform password resets on various third-party services, including Slack and Github. But he said GoDaddy was impossible to reach at the time because it was undergoing a widespread system outage in which phone and email systems were unresponsive.

“We detected this almost immediately [and] started to mitigate [the] attack,” Skorjanc said in an email to this author. “Luckily, we fought them off well and they did not gain access to any important service. Nothing was stolen.”

Skorjanc said NiceHash’s email service was redirected to privateemail.com, an email platform run by Namecheap Inc., another large domain name registrar. Using Farsight Security, a service which maps changes to domain name records over time, KrebsOnSecurity instructed the service to show all domains registered at GoDaddy that had alterations to their email records in the past week which pointed them to privateemail.com. Those results were then indexed against the top one million most popular websites according to Alexa.com.

The result shows that several other cryptocurrency platforms also may have been targeted by the same group, including Bibox.com, Celsius.network, and Wirex.app. None of these companies responded to requests for comment.

In response to questions from KrebsOnSecurity, GoDaddy acknowledged that “a small number” of customer domain names had been modified after a “limited” number of GoDaddy employees fell for a social engineering scam. GoDaddy said the outage between 7:00 p.m. and 11:00 p.m. PST on Nov. 17 was not related to a security incident, but rather a technical issue that materialized during planned network maintenance.

“Separately, and unrelated to the outage, a routine audit of account activity identified potential unauthorized changes to a small number of customer domains and/or account information,” GoDaddy spokesperson Dan Race said. “Our security team investigated and confirmed threat actor activity, including social engineering of a limited number of GoDaddy employees.”

“We immediately locked down the accounts involved in this incident, reverted any changes that took place to accounts, and assisted affected customers with regaining access to their accounts,” GoDaddy’s statement continued. “As threat actors become increasingly sophisticated and aggressive in their attacks, we are constantly educating employees about new tactics that might be used against them and adopting new security measures to prevent future attacks.”

Race declined to specify how its employees were tricked into making the unauthorized changes, saying the matter was still under investigation. But in the attacks earlier this year that affected escrow.com and several other GoDaddy customer domains, the assailants targeted employees over the phone, and were able to read internal notes that GoDaddy employees had left on customer accounts.

What’s more, the attack on escrow.com redirected the site to an Internet address in Malaysia that hosted fewer than a dozen other domains, including the phishing website servicenow-godaddy.com. This suggests the attackers behind the March incident — and possibly this latest one — succeeded by calling GoDaddy employees and convincing them to use their employee credentials at a fraudulent GoDaddy login page. Continue reading →

Convicted SIM Swapper Gets 3 Years in Jail

November 20, 2020
27 Comments

A 21-year-old Irishman who pleaded guilty to charges of helping to steal millions of dollars in cryptocurrencies from victims has been sentenced to just under three years in prison. The defendant is part of an alleged conspiracy involving at least eight others in the United States who stand accused of theft via SIM swapping, a crime that involves convincing mobile phone company employees to transfer ownership of the target’s phone number to a device the attackers control.

Conor Freeman of Dublin took part in the theft of more than two million dollars worth of cryptocurrency from different victims throughout 2018. Freeman was named as a member of a group of alleged SIM swappers called “The Community” charged last year with wire fraud in connection with SIM swapping attacks that netted in excess of $2.4 million.

Among the eight others accused are three former wireless phone company employees who allegedly helped the gang hijack mobile numbers tied to their targets. Prosecutors say the men would identify people likely to have significant cryptocurrency holdings, then pay their phone company cohorts to transfer the victim’s mobile service to a new SIM card — the smart chip in each phone that ties a customer’s device to their number.

A fraudulent SIM swap allows the bad guys to intercept a target’s incoming phone calls and text messages. This is dangerous because a great many sites and services still allow customers to reset their passwords simply by clicking on a link sent via SMS. From there, attackers can gain access to any accounts that allow password resets via SMS or automated calls, from email and social media profiles to virtual currency trading platforms.

Like other accused members of The Community, Freeman was an active member of OGUsers, a forum that caters to people selling access to hijacked social media and other online accounts. But unlike others in the group, Freeman used his real name (username: Conor), and disclosed his hometown and date of birth to others on the forum. At least twice in the past few years OGUsers was hacked, and its database of profiles and user messages posted online.

According to a report in The Irish Times, Freeman spent approximately €130,000, which he had converted into cash from the stolen cryptocurrency. Conor posted on OGUsers that he spent approximately $14,000 on a Rolex watch. The rest was handed over to the police in the form of an electronic wallet that held the equivalent of more than $2 million. Continue reading →

Trump Fires Security Chief Christopher Krebs

November 18, 2020
534 Comments

President Trump on Tuesday fired his top election security official Christopher Krebs (no relation). The dismissal came via Twitter two weeks to the day after Trump lost an election he baselessly claims was stolen by widespread voting fraud.

Chris Krebs. Image: CISA.

Krebs, 43, is a former Microsoft executive appointed by Trump to head the Cybersecurity and Infrastructure Security Agency (CISA), a division of the U.S. Department of Homeland Security. As part of that role, Krebs organized federal and state efforts to improve election security, and to dispel disinformation about the integrity of the voting process.

Krebs’ dismissal was hardly unexpected. Last week, in the face of repeated statements by Trump that the president was robbed of re-election by buggy voting machines and millions of fraudulently cast ballots, Krebs’ agency rejected the claims as “unfounded,” asserting that “the November 3rd election was the most secure in American history.”

In a statement on Nov. 12, CISA declared “there is no evidence that any voting system deleted or lost votes, changed votes, or was in any way compromised.”

But in a tweet Tuesday evening, Trump called that assessment “highly inaccurate,” alleging there were “massive improprieties and fraud — including dead people voting, Poll watchers not allowed into polling locations, ‘glitches’ in the voting machines that changed votes from Trump to Biden, late voting, and many more.”

Twitter, as it has done with a remarkable number of the president’s tweets lately, flagged the statements as disputed.

By most accounts, Krebs was one of the more competent and transparent leaders in the Trump administration. But that same transparency may have cost him his job: Krebs’ agency earlier this year launched “Rumor Control,” a blog that sought to address many of the conspiracy theories the president has perpetuated in recent days.

Sen. Richard Burr, a Republican from North Carolina, said Krebs had done “a remarkable job during a challenging time,” and that the “creative and innovative campaign CISA developed to promote cybersecurity should serve as a model for other government agencies.”

Sen. Angus King, an Independent from Maine and co-chair of a commission to improve the nation’s cyber defense posture, called Krebs “an incredibly bright, high-performing, and dedicated public servant who has helped build up new cyber capabilities in the face of swiftly-evolving dangers.”

“By firing Mr. Krebs for simply doing his job, President Trump is inflicting severe damage on all Americans – who rely on CISA’s defenses, even if they don’t know it,” King said in a written statement. “If there’s any silver lining in this unjust decision, it’s this: I hope that President-elect Biden will recognize Chris’s contributions, and consult with him as the Biden administration charts the future of this critically important agency.” Continue reading →

Be Very Sparing in Allowing Site Notifications

November 17, 2020
62 Comments

An increasing number of websites are asking visitors to approve “notifications,” browser modifications that periodically display messages on the user’s mobile or desktop device. In many cases these notifications are benign, but several dodgy firms are paying site owners to install their notification scripts and then selling that communications pathway to scammers and online hucksters.

Notification prompts in Firefox (left) and Google Chrome.

When a website you visit asks permission to send notifications and you approve the request, the resulting messages that pop up appear outside of the browser. For example, on Microsoft Windows systems they typically show up in the bottom right corner of the screen — just above the system clock. These so-called “push notifications” rely on an Internet standard designed to work similarly across different operating systems and web browsers.

But many users may not fully grasp what they are consenting to when they approve notifications, or how to tell the difference between a notification sent by a website and one made to appear like an alert from the operating system or another program that’s already installed on the device.

This is evident by the apparent scale of the infrastructure behind a relatively new company based in Montenegro called PushWelcome, which advertises the ability for site owners to monetize traffic from their visitors. The company’s site currently is ranked by Alexa.com as among the top 2,000 sites in terms of Internet traffic globally.

Website publishers who sign up with PushWelcome are asked to include a small script on their page which prompts visitors to approve notifications. In many cases, the notification approval requests themselves are deceptive — disguised as prompts to click “OK” to view video material, or as “CAPTCHA” requests designed to distinguish automated bot traffic from real visitors.

An ad from PushWelcome touting the money that websites can make for embedding their dodgy push notifications scripts.

Approving notifications from a site that uses PushWelcome allows any of the company’s advertising partners to display whatever messages they choose, whenever they wish to, and in real-time. And almost invariably, those messages include misleading notifications about security risks on the user’s system, prompts to install other software, ads for dating sites, erectile disfunction medications, and dubious investment opportunities.

That’s according to a deep analysis of the PushWelcome network compiled by Indelible LLC, a cybersecurity firm based in Portland, Ore. Frank Angiolelli, vice president of security at Indelible, said rogue notifications can be abused for credential phishing, as well as foisting malware and other unwanted applications on users.

“This method is currently being used to deliver something akin to adware or click fraud type activity,” Angiolelli said. “The concerning aspect of this is that it is so very undetected by endpoint security programs, and there is a real risk this activity can be used for much more nefarious purposes.”

Sites affiliated with PushWelcome often use misleading messaging to trick people into approving notifications.

Continue reading →

Patch Tuesday, November 2020 Edition

November 10, 2020
35 Comments

Adobe and Microsoft each issued a bevy of updates today to plug critical security holes in their software. Microsoft’s release includes fixes for 112 separate flaws, including one zero-day vulnerability that is already being exploited to attack Windows users. Microsoft also is taking flak for changing its security advisories and limiting the amount of information disclosed about each bug.

Some 17 of the 112 issues fixed in today’s patch batch involve “critical” problems in Windows, or those that can be exploited by malware or malcontents to seize complete, remote control over a vulnerable Windows computer without any help from users.

Most of the rest were assigned the rating “important,” which in Redmond parlance refers to a vulnerability whose exploitation could “compromise the confidentiality, integrity, or availability of user data, or of the integrity or availability of processing resources.”

A chief concern among all these updates this month is CVE-2020-17087, which is an “important” bug in the Windows kernel that is already seeing active exploitation. CVE-2020-17087 is not listed as critical because it’s what’s known as a privilege escalation flaw that would allow an attacker who has already compromised a less powerful user account on a system to gain administrative control. In essence, it would have to be chained with another exploit.

Unfortunately, this is exactly what Google researchers described witnessing recently. On Oct. 20, Google released an update for its Chrome browser which fixed a bug (CVE-2020-15999) that was seen being used in conjunction with CVE-2020-17087 to compromise Windows users.

If you take a look at the advisory Microsoft released today for CVE-2020-17087 (or any others from today’s batch), you might notice they look a bit more sparse. That’s because Microsoft has opted to restructure those advisories around the Common Vulnerability Scoring System (CVSS) format to more closely align the format of the advisories with that of other major software vendors.

But in so doing, Microsoft has also removed some useful information, such as the description explaining in broad terms the scope of the vulnerability, how it can be exploited, and what the result of the exploitation might be. Microsoft explained its reasoning behind this shift in a blog post.

Not everyone is happy with the new format. Bob Huber, chief security officer at Tenable, praised Microsoft for adopting an industry standard, but said the company should consider that folks who review Patch Tuesday releases aren’t security practitioners but rather IT counterparts responsible for actually applying the updates who often aren’t able (and shouldn’t have to) decipher raw CVSS data.

“With this new format, end users are completely blind to how a particular CVE impacts them,” Huber said. “What’s more, this makes it nearly impossible to determine the urgency of a given patch. It’s difficult to understand the benefits to end-users. However, it’s not too difficult to see how this new format benefits bad actors. They’ll reverse engineer the patches and, by Microsoft not being explicit about vulnerability details, the advantage goes to attackers, not defenders. Without the proper context for these CVEs, it becomes increasingly difficult for defenders to prioritize their remediation efforts.” Continue reading →