Krebs on Security

Carbon Emissions: Oversharing Bug Puts Security Vendor Back in Spotlight

August 18, 2017

Last week, security firm DirectDefense came under fire for over-hyping claims that Cb Response, a cybersecurity product sold by competitor Carbon Black, was leaking proprietary data from customers who use it. Carbon Black responded that the bug identified by its competitor was a feature, and that customers were amply cautioned in advance about the potential privacy risks of using the feature. Now Carbon Black is warning that an internal review has revealed a wholly separate bug in Cb Response that could in fact result in some customers unintentionally sharing sensitive files.

cblogo As noted in last week’s story, DirectDefense warned about a problem with Cb Response’s use of Google’s VirusTotal — a free tool that lets anyone submit a suspicious file and have it scanned against dozens of commercial anti-malware tools. There is also a paid version of VirusTotal that allows customers to examine any file uploaded to the service.

Specifically, DirectDefense claimed that Cb Response’s sharing of suspicious files with VirusTotal could expose sensitive data because VirusTotal allows paying customers to download any files submitted by other users. DirectDefense labeled the bug “the world’s largest pay-for-play data exfiltration botnet.”

Numerous industry analysts leapt to Carbon Black’s defense — with some even calling “bullshit” on the findings — pointing out that plenty of other vendors submit files through Virustotal and that DirectDefense was merely trying to besmirch a competitor’s product.

But earlier this week, Carbon Black began quietly notifying customers that an internal review of the claims revealed a completely different bug that could result in some benign customer files being miscategorized as executable files and inadvertently uploaded to Virustotal for scanning.

“On Thursday, we discovered a bug affecting a small percentage of our Cb Response customers,” said Mike Viscuso, co-founder and chief technology officer at Carbon Black. “Our review is still ongoing, but based on what we learned to date it requires a very specific customer configuration, and we have already taken steps to remediate the bug and protect our customers.” Continue reading →

Blowing the Whistle on Bad Attribution

August 18, 2017

41 Comments

The New York Times this week published a fascinating story about a young programmer in Ukraine who’d turned himself in to the local police. The Times says the man did so after one of his software tools was identified by the U.S. government as part of the arsenal used by Russian hackers suspected of hacking into the Democratic National Committee (DNC) last year. It’s a good read, as long as you can ignore that the premise of the piece is completely wrong.

The story, “In Ukraine, a Malware Expert Who Could Blow the Whistle on Russian Hacking,” details the plight of a hacker in Kiev better known as “Profexer,” who has reportedly agreed to be a witness for the FBI. From the story:

“Profexer’s posts, already accessible to only a small band of fellow hackers and cybercriminals looking for software tips, blinked out in January — just days after American intelligence agencies publicly identified a program he had written as one tool used in Russian hacking in the United States. American intelligence agencies have determined Russian hackers were behind the electronic break-in of the Democratic National Committee.”

The Times’ reasoning for focusing on the travails of Mr. Profexer comes from the “GRIZZLYSTEPPE” report, a collection of technical indicators or attack “signatures” published in December 2016 by the U.S. government that companies can use to determine whether their networks may be compromised by a number of different Russian cybercrime groups.

The only trouble is nothing in the GRIZZLYSTEPPE report said which of those technical indicators were found in the DNC hack. In fact, Prefexer’s “P.A.S. Web shell” tool — a program designed to insert a digital backdoor that lets attackers control a hacked Web site remotely — was specifically not among the hacking tools found in the DNC break-in.

The P.A.S. Web shell, as previously offered for free on the now-defunct site profexer[dot]name.

That’s according to Crowdstrike, the company called in to examine the DNC’s servers following the intrusion. In a statement released to KrebsOnSecurity, Crowdstrike said it published the list of malware that it found was used in the DNC hack, and that the Web shell named in the New York Times story was not on that list.

Robert M. Lee is founder of the industrial cybersecurity firm Dragos, Inc. and an expert on the challenges associated with attribution in cybercrime. In a post on his personal blog, Lee challenged The Times on its conclusions.

“The GRIZZLYSTEPPE report has nothing to do with the DNC breach though and was a collection of technical indicators the government compiled from multiple agencies all working different Russian related threat groups,” Lee wrote.

“The threat group that compromised the DNC was Russian but not all Russian groups broke into the DNC,” he continued. “The GRIZZLYSTEPPE report was also highly criticized for its lack of accuracy and lack of a clear message and purpose. I covered it here on my blog but that was also picked up by numerous journalists and covered elsewhere [link added]. In other words, there’s no excuse for not knowing how widely criticized the GRIZZLYSTEPPE report was before citing it as good evidence in a NYT piece.”

Perhaps in response to Lee’s blog post, The Times issued a correction to the story, re-writing the above-quoted and indented paragraph to read:

“It is the first known instance of a living witness emerging from the arid mass of technical detail that has so far shaped the investigation into the election hacking and the heated debate it has stirred. The Ukrainian police declined to divulge the man’s name or other details, other than that he is living in Ukraine and has not been arrested.”

[Side note: Profexer may well have been doxed by this publication just weeks after the GRIZZLYSTEPPE report was released.] Continue reading →

Beware of Security by Press Release

August 10, 2017

45 Comments

On Wednesday, the security industry once again witnessed an all-too-familiar cycle: I call it “security by press release.” It goes a bit like this: A security firm releases a report claiming to have unearthed a major flaw in a competitor’s product; members of the trade press uncritically republish the claims without adding much clarity or waiting for responses from the affected vendor; blindsided vendor responds in a blog post showing how the issue is considerably less dire than originally claimed.

At issue are claims made by Denver-based security company DirectDefense, which published a report this week warning that Cb Response — a suite of security tools sold by competitor Carbon Black (formerly Bit9) — was leaking potentially sensitive and proprietary data from customers who use its product.

snm

DirectDefense warned about a problem with Cb Response’s use of “a cloud-based multiscanner” to scan suspicious files for malware. DirectDefense didn’t name the scanner in question, but it’s Google’s VirusTotal — a free tool that lets anyone submit a suspicious file and have it scanned against dozens of commercial anti-malware tools. There’s also a paid version of VirusTotal that allows customers to examine any file uploaded to the service.

Specifically, DirectDefense claimed that Cb Response’s sharing of suspicious files with VirusTotal could expose sensitive data because VirusTotal allows paying customers to download any files submitted by other users. This is the full extent of the “vulnerability” that DirectDefense labeled “the world’s largest pay-for-play data exfiltration botnet.”

Carbon Black responded with its own blog post noting that the feature DirectDefense warned about was not turned on by default, and that Carbon Black informs customers of the privacy risks that may be associated with sharing files with VirusTotal.

ANALYSIS

Adrian Sanabria, a security expert and co-founder of Savage Security, published a blog post that called “bullshit” on DirectDefense’s findings, noting that the company inexplicably singles out a competitor when many other security firms similarly allow customers to submit files to VirusTotal.

“Dozens of other security vendors either have an option to automatically submit binaries (yes, whole binaries, not just the hash) to VirusTotal or do it without the customers knowledge altogether,” Sanabria wrote. “In singling out Carbon Black, DirectDefense opens itself up to criticism and closer scrutiny.”

Such as shilling for a partner firm (Cylance) that stands to gain from taking Carbon Black down a few notches in the public eye, Sanabria observed [link added].

“I personally don’t believe DirectDefense is a shill for Cylance, but in singling out one of many vendors that do the same thing, they’ve stepped into a classic PR gaffe that makes them look like one,” he wrote. Continue reading →

Alleged vDOS Operators Arrested, Charged

August 9, 2017

20 Comments

Two young Israeli men alleged by this author to have co-founded vDOS — until recently the largest and most profitable cyber attack-for-hire service online — were arrested and formally indicted this week in Israel on conspiracy and hacking charges.

On Sept. 8, 2016, KrebsOnSecurity published a story about the hacking of vDOS, a service that attracted tens of thousands of paying customers and facilitated more than two million distributed denial-of-service (DDoS) attacks over the four year period it was in business.

That story named two then 18-year-old Israelis — Yarden “applej4ck” Bidani and Itay “p1st” Huri — as the likely owners and operators of vDOS. Within hours of that story’s publication the two were detained by Israeli police, placed on house arrest for 10 days, and forbidden from using the Internet for a month.

vDOS as it existed on Sept. 8, 2016.

On Tuesday, Israeli prosecutors announced they had formally arrested and charged two 19-year-olds with conspiring to commit a felony, prohibited activities, tampering with or disrupting a computer, and storing or disseminating false information. A statement from a spokesman for the Israeli state attorney’s office said prosecutors couldn’t name the accused because their alleged crimes were committed while they were minors.

But a number of details match perfectly with previous reporting on Bidani and Huri. As noted in the original Sept. 2016 expose’ on vDOS’s alleged founders, Israeli prosecutors say the two men made more than $600,000 in two of the four years the service was in operation. vDOS was shuttered for good not longer after Bidani and Huri’s initial detention in Sept. 2016.

“The defendants were constantly improving the attack code and finding different network security weaknesses that would enable them to offer increased attack services that could overcome existing defenses and create real damage to servers and services worldwide,” Israeli prosecutors alleged of the accused and their enterprise. Continue reading →

Critical Security Fixes from Adobe, Microsoft

August 8, 2017

19 Comments

Adobe has released updates to fix dozens of vulnerabilities in its Acrobat, Reader and Flash Player software. Separately, Microsoft today issued patches to plug 48 security holes in Windows and other Microsoft products. If you use Windows or Adobe products, it’s time once again to get your patches on.

More than two dozen of the vulnerabilities fixed in today’s Windows patch bundle address “critical” flaws that can be exploited by malware or miscreants to assume complete, remote control over a vulnerable PC with little or no help from the user.

Security firm Qualys recommends that top priority for patching should go to a vulnerability in the Windows Search service, noting that this is the third recent Patch Tuesday to feature a vulnerability in this service.

Qualys’ Jimmy Graham observes that many of the vulnerabilities in this month’s release involve the Windows Scripting Engine, which can impact both browsers and Microsoft Office, and should be considered for prioritizing for workstation-type systems.

According to Microsoft, none of flaws in August’s Patch Tuesday are being actively exploited in the wild, although Bleeping Computer notes that three of the bugs were publicly detailed before today’s patch release.

Case in point: This month’s patch batch from Microsoft does not address the recently-detailed SMBLoris flaw, a vulnerability in all versions of Windows that can be used to remotely freeze up vulnerable systems or cause them to crash. Continue reading →

Flash Player is Dead, Long Live Flash Player!

August 2, 2017

39 Comments

Adobe last week detailed plans to retire its Flash Player software, a cross-platform browser plugin so powerful and so packed with security holes that it has become the favorite target of malware developers. To help eradicate this ubiquitous liability, Adobe is enlisting the help of Apple, Facebook, Google, Microsoft and Mozilla. But don’t break out the bubbly just yet: Adobe says Flash won’t be put down officially until 2020.

In a blog post about the move, Adobe said more sites are turning away from proprietary code like Flash toward open standards like HTML5, WebGL and WebAssembly, and that these components now provide many of the capabilities and functionalities that plugins pioneered.

“Over time, we’ve seen helper apps evolve to become plugins, and more recently, have seen many of these plugin capabilities get incorporated into open web standards,” Adobe said. “Today, most browser vendors are integrating capabilities once provided by plugins directly into browsers and deprecating plugins.”

It’s remarkable how quickly Flash has seen a decline in both use and favor, particularly among the top browser makers. Just three years ago, at least 80 percent of desktop Chrome users visited a site with Flash each day, according to Google. Today, usage of Flash among Chrome users stands at just 17 percent and continues to decline (see Google graphic below).

For Mac users, the turning away from Flash began in 2010, when Apple co-founder Steve Jobs famously penned his “Thoughts on Flash” memo that outlined the reasons why the technology would not be allowed on the company’s iOS products. Apple stopped pre-installing the plugin that same year.

The percentage of Chrome users over time that have used Flash on a Web site. Image: Google.

“Today, if users install Flash, it remains off by default,” a post by Apple’s WebKit Team explains. “Safari requires explicit approval on each website before running the Flash plugin.”

Mozilla said that starting this month Firefox users will choose which websites are able to run the Flash plugin.

“Flash will be disabled by default for most users in 2019, and only users running the Firefox Extended Support Release will be able to continue using Flash through the final end-of-life at the end of 2020,” writes Benjamin Smedberg for Mozilla. “In order to preserve user security, once Flash is no longer supported by Adobe security patches, no version of Firefox will load the plugin.” Continue reading →

New Bill Seeks Basic IoT Security Standards

August 1, 2017

45 Comments

Lawmakers in the U.S. Senate today introduced a bill that would set baseline security standards for the government’s purchase and use of a broad range of Internet-connected devices, including computers, routers and security cameras. The legislation, which also seeks to remedy some widely-perceived shortcomings in existing cybercrime law, was developed in direct response to a series of massive cyber attacks in 2016 that were fueled for the most part by poorly-secured “Internet of Things” (IoT) devices.

iotc

The IoT Cybersecurity Improvement Act of 2017 seeks to use the government’s buying power to signal the basic level of security that IoT devices sold to Uncle Sam will need to have. For example, the bill would require vendors of Internet-connected devices purchased by the federal government make sure the devices can be patched when security updates are available; that the devices do not use hard-coded (unchangeable) passwords; and that vendors ensure the devices are free from known vulnerabilities when sold.

The bill, introduced by Sens. Steve Daines (R-Mont.), Cory Gardner (R-Colo.), Mark Warner (D-Va.) and Ron Wyden (D-Ore.), directs the White House Office of Management and Budget (OMB) to develop alternative network-level security requirements for devices with limited data processing and software functionality. In addition, it requires each executive agency to inventory all Internet-connected devices in use by the agency.

The bill’s provisions would seem to apply to virtually any device that has an Internet connection and can transmit data. Under the proposal, an IoT device has a fairly broad definition, being described as “a physical object that is capable of connecting to and is in regular connection with the Internet;” and one that “has computer processing capabilities that can collect, send or receive data.” Continue reading →

Suspended Sentence for Mirai Botmaster Daniel Kaye

July 28, 2017

42 Comments

Last month, KrebsOnSecurity identified U.K. citizen Daniel Kaye as the likely real-life identity behind a hacker responsible for clumsily wielding a powerful botnet built on Mirai, a malware strain that enslaves poorly secured Internet of Things (IoT) devices for use in large-scale online attacks. Today, a German court issued a suspended sentence for Kaye, who now faces cybercrime charges in the United Kingdom.

Daniel Kaye’s Facebook profile page.

In February 2017, authorities in the United Kingdom arrested a 29-year-old U.K. man on suspicion of knocking more than 900,000 Germans offline in a Mirai attack in November 2016. Shortly after that 2016 attack, a hacker using the nickname “Bestbuy” told reporters he was responsible for the outage, apologizing for the incident.

Prosecutors in Europe had withheld Kaye’s name from the media throughout the trial. But a court in Germany today confirmed Kaye’s identity as it handed down a suspended sentence on charges stemming from several failed attacks from his Mirai botnet — which nevertheless caused extensive internet outages for ISPs in the U.K., Germany and Liberia last year.

On July 5, KrebsOnSecurity published Who is the GovRAT Author and Mirai Botmaster BestBuy. The story followed clues from reports produced by a half-dozen security firms that traced common clues between this BestBuy nickname and an alter-ego, “Spiderman.”

Both identities were connected to the sale of an espionage tool called GovRAT, which is documented to have been used in numerous cyber espionage campaigns against governments, financial institutions, defense contractors and more than 100 corporations.

That July 5 story traced a trail of digital clues left over 10 years back to Daniel Kaye, a 29-year-old man who had dual U.K. and Israeli citizenship and who was engaged to be married to a U.K. woman.

A “mind map” tracing some of the research mentioned in this post.

Last week, a 29-year-old identified by media only as “Daniel K” pleaded guilty in a German court for launching the attacks that knocked 900,000 Deutsche Telekom customers offline. Prosecutors said Daniel K sold access to his Mirai botnet as an attack-for-hire service.

The defendant reportedly told the court that the incident was the biggest mistake of his life, and that he took money in exchange for launching attacks in order to help start a new life with his fiancee. Continue reading →

Gas Pump Skimmer Sends Card Data Via Text

July 27, 2017

82 Comments

Skimming devices that crooks install inside fuel station gas pumps frequently rely on an embedded Bluetooth component allowing thieves to collect stolen credit card data from the pumps wirelessly with any mobile device. The downside of this approach is that Bluetooth-based skimmers can be detected by anyone else with a mobile device. Now, investigators in the New York say they are starting to see pump skimmers that use cannibalized cell phone components to send stolen card data via text message.

Skimmers that transmit stolen card data wirelessly via GSM text messages and other mobile-based communications methods are not new; they have been present — if not prevalent — in ATM skimming devices for ages.

But this is the first instance KrebsOnSecurity is aware of in which such SMS skimmers have been found inside gas pumps, and that matches the experience of several states hardest hit by pump skimming activity.

The beauty of the GSM-based skimmer is that it can transmit stolen card data wirelessly via text message, meaning thieves can receive real-time transmissions of the card data anywhere in the world — never needing to return to the scene of the crime. That data can then be turned into counterfeit physical copies of the cards.

Here’s a look at a new skimmer pulled from compromised gas pumps at three different filling stations in New York this month. Like other pump skimmers, this device was hooked up to the pump’s internal power, allowing it to operate indefinitely without relying on batteries.

A GSM-based card skimmer found embedded in a gas pump in the northeastern United States.

It may be difficult to see from the picture above, but the skimmer includes a GSM-based device with a SIM card produced by cellular operator T-Mobile. The image below shows the other side of the pump skimmer, with the SIM card visible in the upper right corner of the circuitboard:

The reverse side of this GSM-based pump skimmer shows a SIM card from T-Mobile.

It’s not clear what type of mobile device was used in this skimmer, and the police officer who shared these images with KrebsOnSecurity said the forensic analysis of the device was ongoing. Continue reading →

How a Citadel Trojan Developer Got Busted

July 25, 2017

56 Comments

A U.S. District Court judge in Atlanta last week handed a five year prison sentence to Mark Vartanyan, a Russian hacker who helped develop and sell the once infamous and widespread Citadel banking trojan. This fact has been reported by countless media outlets, but far less well known is the fascinating backstory about how Vartanyan got caught.

For several years, Citadel ruled the malware scene for criminals engaged in stealing online banking passwords and emptying bank accounts. U.S. prosecutors say Citadel infected more than 11 million computers worldwide, causing financial losses of at least a half billion dollars.

Like most complex banking trojans, Citadel was marketed and sold in secluded, underground cybercrime markets. Often the most time-consuming and costly aspect of malware sales and development is helping customers with any tech support problems they may have in using the crimeware.

In light of that, one innovation that Citadel brought to the table was to crowdsource some of this support work, easing the burden on the malware’s developers and freeing them up to spend more time improving their creations and adding new features.

Citadel users discuss the merits of including a module to remove other parasites from host PCs.

Citadel boasted an online tech support system for customers designed to let them file bug reports, suggest and vote on new features in upcoming malware versions, and track trouble tickets that could be worked on by the malware developers and fellow Citadel users alike. Citadel customers also could use the system to chat and compare notes with fellow users of the malware.

It was this very interactive nature of Citadel’s support infrastructure that FBI agents would ultimately use to locate and identify Vartanyan, who went by the nickname “Kolypto.” The nickname of the core seller of Citadel was “Aquabox,” and the FBI was keen to identify Aquabox and any programmers he’d hired to help develop Citadel.

In June 2012, FBI agents bought several licenses of Citadel from Aquabox, and soon the agents were suggesting tweaks to the malware that they could use to their advantage. Posing as an active user of the malware, FBI agents informed the Citadel developers that they’d discovered a security vulnerability in the Web-based interface that Citadel customers used to keep track of and collect passwords from infected systems (see screenshot below).

A screenshot of the Citadel botnet panel.

A screenshot of the Web-based Citadel botnet control panel.

Continue reading →

Last »