Infrastructure Laundering: Blending in with the Cloud

In an effort to blend in and make their malicious traffic tougher to block, hosting firms catering to cybercriminals in China and Russia increasingly are funneling their operations through major U.S. cloud providers. Research published this week on one such outfit — a sprawling network tied to Chinese organized crime gangs and aptly named “Funnull” — highlights a persistent whac-a-mole problem facing cloud services.

In October 2024, the security firm Silent Push published a lengthy analysis of how Amazon AWS and Microsoft Azure were providing services to Funnull, a two-year-old Chinese content delivery network that hosts a wide variety of fake trading apps, pig butchering scams, gambling websites, and retail phishing pages.

Funnull made headlines last summer after it acquired the domain name polyfill[.]io, previously the home of a widely-used open source code library that allowed older browsers to handle advanced functions that weren’t natively supported. There were still tens of thousands of legitimate domains linking to the Polyfill domain at the time of its acquisition, and Funnull soon after conducted a supply-chain attack that redirected visitors to malicious sites.

Silent Push’s October 2024 report found a vast number of domains hosted via Funnull promoting gambling sites that bear the logo of the Suncity Group, a Chinese entity named in a 2024 UN report (PDF) for laundering millions of dollars for the North Korean Lazarus Group.

In 2023, Suncity’s CEO was sentenced to 18 years in prison on charges of fraud, illegal gambling, and “triad offenses,” i.e. working with Chinese transnational organized crime syndicates. Suncity is alleged to have built an underground banking system that laundered billions of dollars for criminals.

It is likely the gambling sites coming through Funnull are abusing top casino brands as part of their money laundering schemes. In reporting on Silent Push’s October report, TechCrunch obtained a comment from Bwin, one of the casinos being advertised en masse through Funnull, and Bwin said those websites did not belong to them.

Gambling is illegal in China except in Macau, a special administrative region of China. Silent Push researchers say Funnull may be helping online gamblers in China evade the Communist party’s “Great Firewall,” which blocks access to gambling destinations.

Silent Push’s Zach Edwards said that upon revisiting Funnull’s infrastructure again this month, they found dozens of the same Amazon and Microsoft cloud Internet addresses still forwarding Funnull traffic through a dizzying chain of auto-generated domain names before redirecting malicious or phishous websites.

Edwards said Funnull is a textbook example of an increasing trend Silent Push calls “infrastructure laundering,” wherein crooks selling cybercrime services will relay some or all of their malicious traffic through U.S. cloud providers.

“It’s crucial for global hosting companies based in the West to wake up to the fact that extremely low quality and suspicious web hosts based out of China are deliberately renting IP space from multiple companies and then mapping those IPs to their criminal client websites,” Edwards told KrebsOnSecurity. “We need these major hosts to create internal policies so that if they are renting IP space to one entity, who further rents it to host numerous criminal websites, all of those IPs should be reclaimed and the CDN who purchased them should be banned from future IP rentals or purchases.”

Reached for comment, Amazon referred this reporter to a statement Silent Push included in a report released today. Amazon said AWS was already aware of the Funnull addresses tracked by Silent Push, and that it had suspended all known accounts linked to the activity.

Amazon said that contrary to implications in the Silent Push report, it has every reason to aggressively police its network against this activity, noting the accounts tied to Funnull used “fraudulent methods to temporarily acquire infrastructure, for which it never pays. Thus, AWS incurs damages as a result of the abusive activity.”

“When AWS’s automated or manual systems detect potential abuse, or when we receive reports of potential abuse, we act quickly to investigate and take action to stop any prohibited activity,” Amazon’s statement continues. “In the event anyone suspects that AWS resources are being used for abusive activity, we encourage them to report it to AWS Trust & Safety using the report abuse form. In this case, the authors of the report never notified AWS of the findings of their research via our easy-to-find security and abuse reporting channels. Instead, AWS first learned of their research from a journalist to whom the researchers had provided a draft.”

Microsoft likewise said it takes such abuse seriously, and encouraged others to report suspicious activity found on its network.

“We are committed to protecting our customers against this kind of activity and actively enforce acceptable use policies when violations are detected,” Microsoft said in a written statement. “We encourage reporting suspicious activity to Microsoft so we can investigate and take appropriate actions.”

Richard Hummel is threat intelligence lead at NETSCOUT. Hummel said it used to be that “noisy” and frequently disruptive malicious traffic — such as automated application layer attacks, and “brute force” efforts to crack passwords or find vulnerabilities in websites — came mostly from botnets, or large collections of hacked devices.

But he said the vast majority of the infrastructure used to funnel this type of traffic is now proxied through major cloud providers, which can make it difficult for organizations to block at the network level.

“From a defenders point of view, you can’t wholesale block cloud providers, because a single IP can host thousands or tens of thousands of domains,” Hummel said.

In May 2024, KrebsOnSecurity published a deep dive on Stark Industries Solutions, an ISP that materialized at the start of Russia’s invasion of Ukraine and has been used as a global proxy network that conceals the true source of cyberattacks and disinformation campaigns against enemies of Russia. Experts said much of the malicious traffic  traversing Stark’s network (e.g. vulnerability scanning and password brute force attacks) was being bounced through U.S.-based cloud providers.

Stark’s network has been a favorite of the Russian hacktivist group called NoName057(16), which frequently launches huge distributed denial-of-service (DDoS) attacks against a variety of targets seen as opposed to Moscow. Hummel said NoName’s history suggests they are adept at cycling through new cloud provider accounts, making anti-abuse efforts into a game of whac-a-mole.

“It almost doesn’t matter if the cloud provider is on point and takes it down because the bad guys will just spin up a new one,” he said. “Even if they’re only able to use it for an hour, they’ve already done their damage. It’s a really difficult problem.”

Edwards said Amazon declined to specify whether the banned Funnull users were operating using compromised accounts or stolen payment card data, or something else.

“I’m surprised they wanted to lean into ‘We’ve caught this 1,200+ times and have taken these down!’ and yet didn’t connect that each of those IPs was mapped to [the same] Chinese CDN,” he said. “We’re just thankful Amazon confirmed that account mules are being used for this and it isn’t some front-door relationship. We haven’t heard the same thing from Microsoft but it’s very likely that the same thing is happening.”

Funnull wasn’t always a bulletproof hosting network for scam sites. Prior to 2022, the network was known as Anjie CDN, based in the Philippines. One of Anjie’s properties was a website called funnull[.]app. Loading that domain reveals a pop-up message by the original Anjie CDN owner, who said their operations had been seized by an entity known as Fangneng CDN and ACB Group, the parent company of Funnull.

“After I got into trouble, the company was managed by my family,” the message explains. “Because my family was isolated and helpless, they were persuaded by villains to sell the company. Recently, many companies have contacted my family and threatened them, believing that Fangneng CDN used penetration and mirroring technology through customer domain names to steal member information and financial transactions, and stole customer programs by renting and selling servers. This matter has nothing to do with me and my family. Please contact Fangneng CDN to resolve it.”

In January 2024, the U.S. Department of Commerce issued a proposed rule that would require cloud providers to create a “Customer Identification Program” that includes procedures to collect data sufficient to determine whether each potential customer is a foreign or U.S. person.

According to the law firm Crowell & Moring LLP, the Commerce rule also would require “infrastructure as a service” (IaaS) providers to report knowledge of any transactions with foreign persons that might allow the foreign entity to train a large AI model with potential capabilities that could be used in malicious cyber-enabled activity.

“The proposed rulemaking has garnered global attention, as its cross-border data collection requirements are unprecedented in the cloud computing space,” Crowell wrote. “To the extent the U.S. alone imposes these requirements, there is concern that U.S. IaaS providers could face a competitive disadvantage, as U.S. allies have not yet announced similar foreign customer identification requirements.”

It remains unclear if the new White House administration will push forward with the requirements. The Commerce action was mandated as part of an executive order President Trump issued a day before leaving office in January 2021.

Sudanese Brothers Arrested in ‘AnonSudan’ Takedown

The U.S. government on Wednesday announced the arrest and charging of two Sudanese brothers accused of running Anonymous Sudan (a.k.a. AnonSudan), a cybercrime business known for launching powerful distributed denial-of-service (DDoS) attacks against a range of targets, including dozens of hospitals, news websites and cloud providers. The younger brother is facing charges that could land him life in prison for allegedly seeking to kill people with his attacks.

Active since at least January 2023, AnonSudan has been described in media reports as a “hacktivist” group motivated by ideological causes. But in a criminal complaint, the FBI said those high-profile cyberattacks were effectively commercials for the hackers’ DDoS-for-hire service, which they sold to paying customers for as little as $150 a day — with up to 100 attacks allowed per day — or $700 for an entire week.

The complaint says despite reports suggesting Anonymous Sudan might be state-sponsored Russian actors pretending to be Sudanese hackers with Islamist motivations, AnonSudan was led by two brothers in Sudan — Ahmed Salah Yousif Omer, 22, and Alaa Salah Yusuuf Omer, 27.

AnonSudan claimed credit for successful DDoS attacks on numerous U.S. companies, causing a multi-day outage for Microsoft’s cloud services in June 2023. The group hit PayPal the following month, followed by Twitter/X (Aug. 2023), and OpenAI (Nov. 2023). An indictment in the Central District of California notes the duo even swamped the websites of the FBI and the Department of State.

Prosecutors say Anonymous Sudan offered a “Limited Internet Shutdown Package,” which would enable customers to shut down internet service providers in specified countries for $500 (USD) an hour. The two men also allegedly extorted some of their victims for money in exchange for calling off DDoS attacks.

The government isn’t saying where the Omer brothers are being held, only that they were arrested in March 2024 and have been in custody since. A statement by the U.S. Department of Justice says the government also seized control of AnonSudan’s DDoS infrastructure and servers after the two were arrested in March.

AnonSudan accepted orders over the instant messaging service Telegram, and marketed its DDoS service by several names, including “Skynet,” “InfraShutdown,” and the “Godzilla botnet.” However, the DDoS machine the Omer brothers allegedly built was not made up of hacked devices — as is typical with DDoS botnets.

Instead, the government alleges Skynet was more like a “distributed cloud attack tool,” with a command and control (C2) server, and an entire fleet of cloud-based servers that forwards C2 instructions to an array of open proxy resolvers run by unaffiliated third parties, which then transmit the DDoS attack data to the victims.

Amazon was among many companies credited with helping the government in the investigation, and said AnonSudan launched its attacks by finding hosting companies that would rent them small armies of servers.

“Where their potential impact becomes really significant is when they then acquire access to thousands of other machines — typically misconfigured web servers — through which almost anyone can funnel attack traffic,” Amazon explained in a blog post. “This extra layer of machines usually hides the true source of an attack from the targets.”

The security firm CrowdStrike said the success of AnonSudan’s DDoS attacks stemmed from a combination of factors, including sophisticated techniques for bypassing DDoS mitigation services. Also, AnonSudan typically launched so-called “Layer 7” attacks that sought to overwhelm targeted “API endpoints” — the back end systems responsible for handling website requests — with bogus requests for data, leaving the target unable to serve legitimate visitors.

The Omer brothers were both charged with one count of conspiracy to damage protected computers. The younger brother — Ahmed Salah — was also charged with three counts of damaging protected computers.

If extradited to the United States, tried and convicted in a court of law, the older brother Alaa Salah would be facing a maximum of five years in prison. But prosecutors say Ahmed Salah could face life in prison for allegedly launching attacks that sought to kill people.

As Hamas fighters broke through the border fence and attacked Israel on Oct. 7, 2023, a wave of rockets was launched into Israel. At the same time, AnonSudan announced it was attacking the APIs that power Israel’s widely-used “red alert” mobile apps that warn residents about any incoming rocket attacks in their area.

In February 2024, AnonSudan launched a digital assault on the Cedars-Sinai Hospital in the Los Angeles area, an attack that caused emergency services and patients to be temporarily redirected to different hospitals.

The complaint alleges that in September 2023, AnonSudan began a week-long DDoS attack against the Internet infrastructure of Kenya, knocking offline government services, banks, universities and at least seven hospitals.

Canadian Man Stuck in Triangle of E-Commerce Fraud

A Canadian man who says he’s been falsely charged with orchestrating a complex e-commerce scam is seeking to clear his name. His case appears to involve “triangulation fraud,” which occurs when a consumer purchases something online — from a seller on Amazon or eBay, for example — but the seller doesn’t actually own the item for sale. Instead, the seller purchases the item from an online retailer using stolen payment card data. In this scam, the unwitting buyer pays the scammer and receives what they ordered, and very often the only party left to dispute the transaction is the owner of the stolen payment card.

Timothy Barker, 56, was until recently a Band Manager at Duncan’s First Nation, a First Nation in northwestern Alberta, Canada. A Band Manager is responsible for overseeing the delivery of all Band programs, including community health services, education, housing, social assistance, and administration.

Barker told KrebsOnSecurity that during the week of March 31, 2023 he and the director of the Band’s daycare program discussed the need to purchase items for the community before the program’s budget expired for the year.

“There was a rush to purchase items on the Fiscal Year 2023 timeline as the year ended on March 31,” Barker recalled.

Barker said he bought seven “Step2 All Around Playtime Patio with Canopy” sets from a seller on Amazon.ca, using his payment card on file to pay nearly $2,000 for the items.

On the morning of April 7, Barker’s Facebook account received several nasty messages from an Ontario woman he’d never met. She demanded to know why he’d hacked her Walmart account and used it to buy things that were being shipped to his residence. Barker shared a follow-up message from the woman, who later apologized for losing her temper.

“If this is not the person who did this to me, I’m sorry, I’m pissed,” the lady from Ontario said. “This order is being delivered April 14th to the address above. If not you, then someone who has the same name. Now I feel foolish.”

On April 12, 2023, before the Amazon purchases had even arrived at his home, Barker received a call from an investigator with the Royal Canadian Mounted Police (RCMP), who said Barker urgently needed to come down to the local RCMP office for an interview related to “an investigation.” Barker said the officer wouldn’t elaborate at the time on the nature of the investigation, and that he told the officer he was in Halifax for several days but could meet after his return home.

According to Barker, the investigator visited his home anyway the following day and began questioning his wife, asking about his whereabouts, his work, and when he might return home.

On April 14, six boxes arrived to partially fulfill his Amazon order; another box was delayed, and the Amazon.ca seller he’d purchased from said the remaining box was expected to ship the following week. Barker said he was confused because all six boxes came from Walmart instead of Amazon, and the shipping labels had his name and address on them but carried a contact phone number in Mexico.

Three days later, the investigator called again, demanding he submit to an interview.

“He then asked where my wife was and what her name is,” Barker said. “He wanted to know her itinerary for the day. I am now alarmed and frightened — this doesn’t feel right.”

Barker said he inquired with a local attorney about a consultation, but that the RCMP investigator showed up at his house before he could speak to the lawyer. The investigator began taking pictures of the boxes from his Amazon order.

“The [investigator] derisively asked why would anyone order so many play sets?” Barker said. “I started to give the very logical answer that we are helping families improve their children’s home life and learning for toddlers when he cut me off and gave the little speech about giving a statement after my arrest. He finally told me that he believes that I used someone’s credit card in Ontario to purchase the Walmart products.”

Eager to clear his name, Barker said he shared with the police copies of his credit card bills and purchase history at Amazon. But on April 21, the investigator called again to say he was coming to arrest Barker for theft.

“He said that if I was home at five o’clock then he would serve the papers at the house and it would go easy and I wouldn’t have to go to the station,” Barker recalled. “If I wasn’t home, then he would send a search team to locate me and drag me to the station. He said he would kick the door down if I didn’t answer my phone. He said he had every right to break our door down.”

Barker said he briefly conferred with an attorney about how to handle the arrest. Later that evening, the RCMP arrived with five squad cars and six officers.

“I asked if handcuffs were necessary – there is no danger of violence,” Barker said. “I was going to cooperate. His response was to turn me around and cuff me. He walked me outside and stood me beside the car for a full 4 or 5 minutes in full view of all the neighbors.”

Barker believes he and the Ontario woman are both victims of triangulation fraud, and that someone likely hacked the Ontario woman’s Walmart account and added his name and address as a recipient.

But he says he has since lost his job as a result of the arrest, and now he can’t find new employment because he has a criminal record. Barker’s former employer — Duncan’s First Nation — did not respond to requests for comment.

“In Canada, a criminal record is not a record of conviction, it’s a record of charges and that’s why I can’t work now,” Barker said. “Potential employers never find out what the nature of it is, they just find out that I have a criminal arrest record.”

Barker said that right after his arrest, the RCMP called the Ontario woman and told her they’d solved the crime and arrested the perpetrator.

“They even told her my employer had put me on administrative leave,” he said. “Surely, they’re not allowed to do that.”

Contacted by KrebsOnSecurity, the woman whose Walmart account was used to fraudulently purchase the child play sets said she’s not convinced this was a case of triangulation fraud. She declined to elaborate on why she believed this, other than to say the police told her Barker was a bad guy.

“I don’t think triangulation fraud was used in this case,” she said. “My actual Walmart.ca account was hacked and an order was placed on my account, using my credit card. The only thing Mr. Barker did was to order the item to be delivered to his address in Alberta.”

Barker shared with this author all of the documentation he gave to the RCMP, including screenshots of his Amazon.ca account showing that the items in dispute were sold by a seller named “Adavio,” and that the merchant behind this name was based in Turkey.

That Adavio account belongs to a young computer engineering student and “SEO expert” based in Adana, Turkey who did not respond to requests for comment.

Amazon.ca said it conducted an investigation and found that Mr. Barker never filed a complaint about the seller or transaction in question. The company noted that Adavio currently has a feedback rating of 4.5 stars out of 5.

“Amazon works hard to provide customers with a great experience and it’s our commitment to go above and beyond to make things right for customers,” Amazon.ca said in a written statement. “If a customer has an issue with an order, they may flag to Amazon through our Customer Service page.”

Barker said when he went to file a complaint with Amazon last year he could no longer find the Adavio account on the website, and that the site didn’t have a category for the type of complaint he wanted to file.

When he first approached KrebsOnSecurity about his plight last summer, Barker said he didn’t want any media attention to derail the chances of having his day in court, and confronting the RCMP investigator with evidence proving that he was being wrongfully prosecuted and maligned.

But a week before his court date arrived at the end of November 2023, prosecutors announced the charges against him would be stayed, meaning they had no immediate plans to prosecute the case further but that the investigation could still be reopened at some point in the future.

The RCMP declined to comment for this story, other than to confirm they had issued a stay of proceedings in the case.

Barker says the stay has left him in legal limbo — denying him the ability to clear his name, while giving the RCMP a free pass for a botched investigation. He says he has considered suing the investigating officer for defamation, but has been told by his attorney that the bar for success in such cases against the government is extremely high.

“I’m a 56-year-old law-abiding citizen, and I haven’t broken any laws,” Barker said, wondering aloud who would be stupid enough to use someone else’s credit card and have the stolen items shipped directly to their home.

“Their putting a stay on the proceedings without giving any evidence or explanation allows them to cover up bad police work,” he said. “It’s all so stupid.”

Triangulation fraud is hardly a new thing. KrebsOnSecurity first wrote about it from an e-commerce vendor’s perspective in 2015, but the scam predates that story by many years and is now a well-understood problem. The Canadian authorities should either let Mr. Barker have his day in court, or drop the charges altogether.

Patch Tuesday, October 2023 Edition

Microsoft today issued security updates for more than 100 newly-discovered vulnerabilities in its Windows operating system and related software, including four flaws that are already being exploited. In addition, Apple recently released emergency updates to quash a pair of zero-day bugs in iOS.

Apple last week shipped emergency updates in iOS 17.0.3 and iPadOS 17.0.3 in response to active attacks. The patch fixes CVE-2023-42724, which attackers have been using in targeted attacks to elevate their access on a local device.

Apple said it also patched CVE-2023-5217, which is not listed as a zero-day bug. However, as Bleeping Computer pointed out, this flaw is caused by a weakness in the open-source “libvpx” video codec library, which was previously patched as a zero-day flaw by Google in the Chrome browser and by Microsoft in Edge, Teams, and Skype products. For anyone keeping count, this is the 17th zero-day flaw that Apple has patched so far this year.

Fortunately, the zero-days affecting Microsoft customers this month are somewhat less severe than usual, with the exception of CVE-2023-44487. This weakness is not specific to Windows but instead exists within the HTTP/2 protocol used by the World Wide Web: Attackers have figured out how to use a feature of HTTP/2 to massively increase the size of distributed denial-of-service (DDoS) attacks, and these monster attacks reportedly have been going on for several weeks now.

Amazon, Cloudflare and Google all released advisories today about how they’re addressing CVE-2023-44487 in their cloud environments. Google’s Damian Menscher wrote on Twitter/X that the exploit — dubbed a “rapid reset attack” — works by sending a request and then immediately cancelling it (a feature of HTTP/2). “This lets attackers skip waiting for responses, resulting in a more efficient attack,” Menscher explained.

Natalie Silva, lead security engineer at Immersive Labs, said this flaw’s impact to enterprise customers could be significant, and lead to prolonged downtime.

“It is crucial for organizations to apply the latest patches and updates from their web server vendors to mitigate this vulnerability and protect against such attacks,” Silva said. In this month’s Patch Tuesday release by Microsoft, they have released both an update to this vulnerability, as well as a temporary workaround should you not be able to patch immediately.”

Microsoft also patched zero-day bugs in Skype for Business (CVE-2023-41763) and Wordpad (CVE-2023-36563). The latter vulnerability could expose NTLM hashes, which are used for authentication in Windows environments.

“It may or may not be a coincidence that Microsoft announced last month that WordPad is no longer being updated, and will be removed in a future version of Windows, although no specific timeline has yet been given,” said Adam Barnett, lead software engineer at Rapid7. “Unsurprisingly, Microsoft recommends Word as a replacement for WordPad.”

Other notable bugs addressed by Microsoft include CVE-2023-35349, a remote code execution weakness in the Message Queuing (MSMQ) service, a technology that allows applications across multiple servers or hosts to communicate with each other. This vulnerability has earned a CVSS severity score of 9.8 (10 is the worst possible). Happily, the MSMQ service is not enabled by default in Windows, although Immersive Labs notes that Microsoft Exchange Server can enable this service during installation.

Speaking of Exchange, Microsoft also patched CVE-2023-36778,  a vulnerability in all current versions of Exchange Server that could allow attackers to run code of their choosing. Rapid7’s Barnett said successful exploitation requires that the attacker be on the same network as the Exchange Server host, and use valid credentials for an Exchange user in a PowerShell session.

For a more detailed breakdown on the updates released today, see the SANS Internet Storm Center roundup. If today’s updates cause any stability or usability issues in Windows, AskWoody.com will likely have the lowdown on that.

Please consider backing up your data and/or imaging your system before applying any updates. And feel free to sound off in the comments if you experience any difficulties as a result of these patches.