KrebsOnSecurity Hit With Near-Record 6.3 Tbps DDoS

KrebsOnSecurity last week was hit by a near record distributed denial-of-service (DDoS) attack that clocked in at more than 6.3 terabits of data per second (a terabit is one trillion bits of data). The brief attack appears to have been a test run for a massive new Internet of Things (IoT) botnet capable of launching crippling digital assaults that few web destinations can withstand. Read on for more about the botnet, the attack, and the apparent creator of this global menace.

For reference, the 6.3 Tbps attack last week was ten times the size of the assault launched against this site in 2016 by the Mirai IoT botnet, which held KrebsOnSecurity offline for nearly four days. The 2016 assault was so large that Akamai – which was providing pro-bono DDoS protection for KrebsOnSecurity at the time — asked me to leave their service because the attack was causing problems for their paying customers.

Since the Mirai attack, KrebsOnSecurity.com has been behind the protection of Project Shield, a free DDoS defense service that Google provides to websites offering news, human rights, and election-related content. Google Security Engineer Damian Menscher told KrebsOnSecurity the May 12 attack was the largest Google has ever handled. In terms of sheer size, it is second only to a very similar attack that Cloudflare mitigated and wrote about in April.

After comparing notes with Cloudflare, Menscher said the botnet that launched both attacks bears the fingerprints of Aisuru, a digital siege machine that first surfaced less than a year ago. Menscher said the attack on KrebsOnSecurity lasted less than a minute, hurling large UDP data packets at random ports at a rate of approximately 585 million data packets per second.

“It was the type of attack normally designed to overwhelm network links,” Menscher said, referring to the throughput connections between and among various Internet service providers (ISPs). “For most companies, this size of attack would kill them.”

The Aisuru botnet comprises a globally-dispersed collection of hacked IoT devices, including routers, digital video recorders and other systems that are commandeered via default passwords or software vulnerabilities. As documented by researchers at QiAnXin XLab, the botnet was first identified in an August 2024 attack on a large gaming platform.

Aisuru reportedly went quiet after that exposure, only to reappear in November with even more firepower and software exploits. In a January 2025 report, XLab found the new and improved Aisuru (a.k.a. “Airashi“) had incorporated a previously unknown zero-day vulnerability in Cambium Networks cnPilot routers.

NOT FORKING AROUND

The people behind the Aisuru botnet have been peddling access to their DDoS machine in public Telegram chat channels that are closely monitored by multiple security firms. In August 2024, the botnet was rented out in subscription tiers ranging from $150 per day to $600 per week, offering attacks of up to two terabits per second.

“You may not attack any measurement walls, healthcare facilities, schools or government sites,” read a notice posted on Telegram by the Aisuru botnet owners in August 2024.

Interested parties were told to contact the Telegram handle “@yfork” to purchase a subscription. The account @yfork previously used the nickname “Forky,” an identity that has been posting to public DDoS-focused Telegram channels since 2021.

According to the FBI, Forky’s DDoS-for-hire domains have been seized in multiple law enforcement operations over the years. Last year, Forky said on Telegram he was selling the domain stresser[.]best, which saw its servers seized by the FBI in 2022 as part of an ongoing international law enforcement effort aimed at diminishing the supply of and demand for DDoS-for-hire services.

“The operator of this service, who calls himself ‘Forky,’ operates a Telegram channel to advertise features and communicate with current and prospective DDoS customers,” reads an FBI seizure warrant (PDF) issued for stresser[.]best. The FBI warrant stated that on the same day the seizures were announced, Forky posted a link to a story on this blog that detailed the domain seizure operation, adding the comment, “We are buying our new domains right now.”

Approximately ten hours later, Forky posted again, including a screenshot of the stresser[.]best user dashboard, instructing customers to use their saved passwords for the old website on the new one.

A review of Forky’s posts to public Telegram channels — as indexed by the cyber intelligence firms Unit 221B and Flashpoint — reveals a 21-year-old individual who claims to reside in Brazil [full disclosure: Flashpoint is currently an advertiser on this blog].

Since late 2022, Forky’s posts have frequently promoted a DDoS mitigation company and ISP that he operates called botshield[.]io. The Botshield website is connected to a business entity registered in the United Kingdom called Botshield LTD, which lists a 21-year-old woman from Sao Paulo, Brazil as the director. Internet routing records indicate Botshield (AS213613) currently controls several hundred Internet addresses that were allocated to the company earlier this year.

Domaintools.com reports that botshield[.]io was registered in July 2022 to a Kaike Southier Leite in Sao Paulo. A LinkedIn profile by the same name says this individual is a network specialist from Brazil who works in “the planning and implementation of robust network infrastructures, with a focus on security, DDoS mitigation, colocation and cloud server services.”

MEET FORKY

In his posts to public Telegram chat channels, Forky has hardly attempted to conceal his whereabouts or identity. In countless chat conversations indexed by Unit 221B, Forky could be seen talking about everyday life in Brazil, often remarking on the extremely low or high prices in Brazil for a range of goods, from computer and networking gear to narcotics and food.

Reached via Telegram, Forky claimed he was “not involved in this type of illegal actions for years now,” and that the project had been taken over by other unspecified developers. Forky initially told KrebsOnSecurity he had been out of the botnet scene for years, only to concede this wasn’t true when presented with public posts on Telegram from late last year that clearly showed otherwise.

Forky denied being involved in the attack on KrebsOnSecurity, but acknowledged that he helped to develop and market the Aisuru botnet. Forky claims he is now merely a staff member for the Aisuru botnet team, and that he stopped running the botnet roughly two months ago after starting a family. Forky also said the woman named as director of Botshield is related to him.

Forky offered equivocal, evasive responses to a number of questions about the Aisuru botnet and his business endeavors. But on one point he was crystal clear:

“I have zero fear about you, the FBI, or Interpol,” Forky said, asserting that he is now almost entirely focused on their hosting business — Botshield.

Forky declined to discuss the makeup of his ISP’s clientele, or to clarify whether Botshield was more of a hosting provider or a DDoS mitigation firm. However, Forky has posted on Telegram about Botshield successfully mitigating large DDoS attacks launched against other DDoS-for-hire services.

DomainTools finds the same Sao Paulo street address in the registration records for botshield[.]io was used to register several other domains, including cant-mitigate[.]us. The email address in the WHOIS records for that domain is forkcontato@gmail.com, which DomainTools says was used to register the domain for the now-defunct DDoS-for-hire service stresser[.]us, one of the domains seized in the FBI’s 2023 crackdown.

On May 8, 2023, the U.S. Department of Justice announced the seizure of stresser[.]us, along with a dozen other domains offering DDoS services. The DOJ said ten of the 13 domains were reincarnations of services that were seized during a prior sweep in December, which targeted 48 top stresser services (also known as “booters”).

Forky claimed he could find out who attacked my site with Aisuru. But when pressed a day later on the question, Forky said he’d come up empty-handed.

“I tried to ask around, all the big guys are not retarded enough to attack you,” Forky explained in an interview on Telegram. “I didn’t have anything to do with it. But you are welcome to write the story and try to put the blame on me.”

THE GHOST OF MIRAI

The 6.3 Tbps attack last week caused no visible disruption to this site, in part because it was so brief — lasting approximately 45 seconds. DDoS attacks of such magnitude and brevity typically are produced when botnet operators wish to test or demonstrate their firepower for the benefit of potential buyers. Indeed, Google’s Menscher said it is likely that both the May 12 attack and the slightly larger 6.5 Tbps attack against Cloudflare last month were simply tests of the same botnet’s capabilities.

In many ways, the threat posed by the Aisuru/Airashi botnet is reminiscent of Mirai, an innovative IoT malware strain that emerged in the summer of 2016 and successfully out-competed virtually all other IoT malware strains in existence at the time.

As first revealed by KrebsOnSecurity in January 2017, the Mirai authors were two U.S. men who co-ran a DDoS mitigation service — even as they were selling far more lucrative DDoS-for-hire services using the most powerful botnet on the planet.

Less than a week after the Mirai botnet was used in a days-long DDoS against KrebsOnSecurity, the Mirai authors published the source code to their botnet so that they would not be the only ones in possession of it in the event of their arrest by federal investigators.

Ironically, the leaking of the Mirai source is precisely what led to the eventual unmasking and arrest of the Mirai authors, who went on to serve probation sentences that required them to consult with FBI investigators on DDoS investigations. But that leak also rapidly led to the creation of dozens of Mirai botnet clones, many of which were harnessed to fuel their own powerful DDoS-for-hire services.

Menscher told KrebsOnSecurity that as counterintuitive as it may sound, the Internet as a whole would probably be better off if the source code for Aisuru became public knowledge. After all, he said, the people behind Aisuru are in constant competition with other IoT botnet operators who are all striving to commandeer a finite number of vulnerable IoT devices globally.

Such a development would almost certainly cause a proliferation of Aisuru botnet clones, he said, but at least then the overall firepower from each individual botnet would be greatly diminished — or at least within range of the mitigation capabilities of most DDoS protection providers.

Barring a source code leak, Menscher said, it would be nice if someone published the full list of software exploits being used by the Aisuru operators to grow their botnet so quickly.

“Part of the reason Mirai was so dangerous was that it effectively took out competing botnets,” he said. “This attack somehow managed to compromise all these boxes that nobody else knows about. Ideally, we’d want to see that fragmented out, so that no [individual botnet operator] controls too much.”

Trump 2.0 Brings Cuts to Cyber, Consumer Protections

One month into his second term, President Trump’s actions to shrink the government through mass layoffs, firings and withholding funds allocated by Congress have thrown federal cybersecurity and consumer protection programs into disarray. At the same time, agencies are battling an ongoing effort by the world’s richest man to wrest control over their networks and data.

The Trump administration has fired at least 130 employees at the federal government’s foremost cybersecurity body — the Cybersecurity and Infrastructure Security Agency (CISA). Those dismissals reportedly included CISA staff dedicated to securing U.S. elections, and fighting misinformation and foreign influence operations.

Earlier this week, technologists with Elon Musk’s Department of Government Efficiency (DOGE) arrived at CISA and gained access to the agency’s email and networked files. Those DOGE staffers include Edward “Big Balls” Coristine, a 19-year-old former denizen of the “Com,” an archipelago of Discord and Telegram chat channels that function as a kind of distributed cybercriminal social network.

The investigative journalist Jacob Silverman writes that Coristine is the grandson of Valery Martynov, a KGB double agent who spied for the United States. Silverman recounted how Martynov’s wife Natalya Martynova moved to the United States with her two children after her husband’s death.

“Her son became a Virginia police officer who sometimes posts comments on blogs about his historically famous father,” Silverman wrote. “Her daughter became a financial professional who married Charles Coristine, the proprietor of LesserEvil, a snack company. Among their children is a 19-year-old young man named Edward Coristine, who currently wields an unknown amount of power and authority over the inner-workings of our federal government.”

Another member of DOGE is Christopher Stanley, formerly senior director for security engineering at X and principal security engineer at Musk’s SpaceX. Stanley, 33, had a brush with celebrity on Twitter in 2015 when he leaked the user database for the DDoS-for-hire service LizardStresser, and soon faced threats of physical violence against his family.

My 2015 story on that leak did not name Stanley, but he exposed himself as the source by posting a video about it on his Youtube channel. A review of domain names registered by Stanley shows he went by the nickname “enKrypt,” and was the former owner of a pirated software and hacking forum called error33[.]net, as well as theC0re, a video game cheating community.

“A NATIONAL CYBERATTACK”

DOGE has been steadily gaining sensitive network access to federal agencies that hold a staggering amount of personal and financial information on Americans, including the Social Security Administration (SSA), the Department of Homeland Security, the Office of Personnel Management (OPM), and the Treasury Department.

Most recently, DOGE has sought broad access to systems at the Internal Revenue Service that contain the personal tax information on millions of Americans, including how much individuals earn and owe, property information, and even details related to child custody agreements. The New York Times reported Friday that the IRS had reached an agreement whereby a single DOGE employee — 25-year-old Gavin Kliger — will be allowed to see only anonymized taxpayer information.

The rapidity with which DOGE has rifled through one federal database after another in the name of unearthing “massive fraud” by government agencies has alarmed many security experts, who warned that DOGE’s actions bypassed essential safeguards and security measures.

“The most alarming aspect isn’t just the access being granted,” wrote Bruce Schneier and Davi Ottenheimer, referring to DOGE as a national cyberattack. “It’s the systematic dismantling of security measures that would detect and prevent misuse—including standard incident response protocols, auditing, and change-tracking mechanisms—by removing the career officials in charge of those security measures and replacing them with inexperienced operators.”

Jacob Williams is a former hacker with the U.S. National Security Agency who now works as managing director of the cybersecurity firm Hunter Labs. Williams kicked a virtual hornet’s nest last week when he posted on LinkedIn that the network incursions by DOGE were “a bigger threat to U.S. federal government information systems than China.”

Williams said while he doesn’t believe anyone at DOGE would intentionally harm the integrity and availability of these systems, it’s widely reported (and not denied) that DOGE introduced code changes into multiple federal IT systems. These code changes, he maintained, are not following the normal process for vetting and review given to federal government IT systems.

“For those thinking ‘I’m glad they aren’t following the normal federal government IT processes, those are too burdensome’ I get where you’re coming from,” Williams wrote. “But another name for ‘red tape’ are ‘controls.’ If you’re comfortable bypassing controls for the advancement of your agenda, I have questions – mostly about whether you do this in your day job too. Please tag your employer letting them know your position when you comment that controls aren’t important (doubly so if you work in cybersecurity). All satire aside, if you’re comfortable abandoning controls for expediency, I implore you to decide where the line is that you won’t cross in that regard.”

The DOGE website’s “wall of receipts” boasts that Musk and his team have saved the federal government more than $55 billion through staff reductions, lease cancellations and terminated contracts. But a team of reporters at The New York Times found the math that could back up those checks is marred with accounting errors, incorrect assumptions, outdated data and other mistakes.

For example, DOGE claimed it saved $8 billion in one contract, when the total amount was actually $8 million, The Times found.

“Some contracts the group claims credit for were double- or triple-counted,” reads a Times story with six bylines. “Another initially contained an error that inflated the totals by billions of dollars. While the DOGE team has surely cut some number of billions of dollars, its slapdash accounting adds to a pattern of recklessness by the group, which has recently gained access to sensitive government payment systems.”

So far, the DOGE website does not inspire confidence: We learned last week that the doge.gov administrators somehow left their database wide open, allowing someone to publish messages that ridiculed the site’s insecurity.

APPOINTMENTS

Trump’s efforts to grab federal agencies by their data has seen him replace career civil servants who refused to allow DOGE access to agency networks. CNN reports that Michelle King, acting commissioner of the Social Security Administration for more than 30 years, was shown the door after she denied DOGE access to sensitive information.

King was replaced by Leland Dudek, formerly a senior advisor in the SSA’s Office of Program Integrity. This week, Dudek posted a now-deleted message on LinkedIn acknowledging he had been placed on administrative leave for cooperating with DOGE.

“I confess,” Dudek wrote. “I bullied agency executives, shared executive contact information, and circumvented the chain of command to connect DOGE with the people who get stuff done. I confess. I asked where the fat was and is in our contracts so we can make the right tough choices.”

According to Wired, the National Institute of Standards and Technology (NIST) was also bracing this week for roughly 500 staffers to be fired, which could have serious impacts on NIST’s cybersecurity standards and software vulnerability tracking work.

“And cuts last week at the US Digital Service included the cybersecurity lead for the central Veterans Affairs portal, VA.gov, potentially leaving VA systems and data more vulnerable without someone in his role,” Wired’s Andy Greenberg and Lily Hay Newman wrote.

NextGov reports that Trump named the Department of Defense’s new chief information security officer: Katie Arrington, a former South Carolina state lawmaker who helped steer Pentagon cybersecurity contracting policy before being put on leave amid accusations that she disclosed classified data from a military intelligence agency.

NextGov notes that the National Security Agency suspended her clearance in 2021, although the exact reasons that led to the suspension and her subsequent leave were classified. Arrington argued that the suspension was a politically motivated effort to silence her.

Trump also appointed the former chief operating officer of the Republican National Committee as the new head of the Office of National Cyber Director. Sean Cairncross, who has no formal experience in technology or security, will be responsible for coordinating national cybersecurity policy, advising the president on cyber threats, and ensuring a unified federal response to emerging cyber-risks, Politico writes.

DarkReading reports that Cairncross would share responsibility for advising the president on cyber matters, along with the director of cyber at the White House National Security Council (NSC) — a group that advises the president on all matters security related, and not just cyber.

CONSUMER PROTECTION?

The president also ordered staffers at the Consumer Financial Protection Bureau (CFPB) to stop most work. Created by Congress in 2011 to be a clearinghouse of consumer complaints, the CFPB has sued some of the nation’s largest financial institutions for violating consumer protection laws.

The CFPB says its actions have put nearly $18 billion back in Americans’ pockets in the form of monetary compensation or canceled debts, and imposed $4 billion in civil money penalties against violators. The CFPB’s homepage has featured a “404: Page not found” error for weeks now.

Trump has appointed Russell Vought, the architect of the conservative policy playbook Project 2025, to be the CFPB’s acting director. Vought has publicly favored abolishing the agency, as has Elon Musk, whose efforts to remake X into a payments platform would otherwise be regulated by the CFPB.

The New York Times recently published a useful graphic showing all of the government staffing changes, including the firing of several top officials, affecting agencies with federal investigations into or regulatory battles with Musk’s companies. Democrats on the House Judiciary Committee also have released a comprehensive account (PDF) of Musk’s various conflicts of interest.

As the Times notes, Musk and his companies have repeatedly failed to comply with federal reporting protocols aimed at protecting state secrets, and these failures have prompted at least three federal reviews. Those include an inquiry launched last year by the Defense Department’s Office of Inspector General. Four days after taking office, Trump fired the DoD inspector general along with 17 other inspectors general.

The Trump administration also shifted the enforcement priorities of the U.S. Securities and Exchange Commission (SEC) away from prosecuting misconduct in the cryptocurrency sector, reassigning lawyers and renaming the unit to focus more on “cyber and emerging technologies.”

Reuters reports that the former SEC chair Gary Gensler made fighting misconduct in a sector he termed the “wild west” a priority for the agency, targeting not only cryptocurrency fraudsters but also the large firms that facilitate trading such as Coinbase.

On Friday, Coinbase said the SEC planned to withdraw its lawsuit against the crypto exchange. Also on Friday, the cryptocurrency exchange Bybit announced on X that a cybersecurity breach led to the theft of more than $1.4 billion worth of cryptocurrencies — making it the largest crypto heist ever.

ORGANIZED CRIME AND CORRUPTION

On Feb. 10, Trump ordered executive branch agencies to stop enforcing the U.S. Foreign Corrupt Practices Act, which froze foreign bribery investigations, and even allows for “remedial actions” of past enforcement actions deemed “inappropriate.”

Trump’s action also disbanded the Kleptocracy Asset Recovery Initiative and KleptoCapture Task Force — units which proved their value in corruption cases and in seizing the assets of sanctioned Russian oligarchs — and diverted resources away from investigating white-collar crime.

That’s according to the independent Organized Crime and Corruption Reporting Project (OCCRP), an investigative journalism outlet that until very recently was funded in part by the U.S. Agency for International Development (USAID).

The OCCRP lost nearly a third of its funding and was forced to lay off 43 reporters and staff after Trump moved to shutter USAID and freeze its spending. NBC News reports the Trump administration plans to gut the agency and leave fewer than 300 staffers on the job out of the current 8,000 direct hires and contractors.

The Global Investigative Journalism Network wrote this week that the sudden hold on USAID foreign assistance funding has frozen an estimated $268 million in agreed grants for independent media and the free flow of information in more than 30 countries — including several under repressive regimes.

Elon Musk has called USAID “a criminal organization” without evidence, and promoted fringe theories on his social media platform X that the agency operated without oversight and was rife with fraud. Just months before the election, USAID’s Office of Inspector General announced an investigation into USAID’s oversight of Starlink satellite terminals provided to the government of Ukraine.

KrebsOnSecurity this week heard from a trusted source that all outgoing email from USAID now carries a notation of “sensitive but unclassified,” a designation that experts say could make it more difficult for journalists and others to obtain USAID email records under the Freedom of Information Act (FOIA). On Feb. 20, Fedscoop reported also hearing the same thing from multiple sources, noting that the added message cannot be seen by senders until after the email is sent.

FIVE BULLETS

On Feb. 18, Trump issued an executive order declaring that only the U.S. attorney general and the president can provide authoritative interpretations of the law for the executive branch, and that this authority extends to independent agencies operating under the executive branch.

Trump is arguing that Article II, Clause 1 of the Constitution vests this power with the president. However, jurist.org writes that Article II does not expressly state the president or any other person in the executive branch has the power to interpret laws.

“The article states that the president is required to ‘take care that the laws be faithfully executed,'” Juris noted. “Jurisdiction to interpret laws and determine constitutionality belongs to the judicial branch under Article III. The framers of the Constitution designed the separation of duties to prevent any single branch of government from becoming too powerful.”

The executive order requires all agencies to submit to “performance standards and management objectives” to be established by the White House Office of Management and Budget, and to report periodically to the president.

Those performance metrics are already being requested: Employees at multiple federal agencies on Saturday reported receiving an email from the Office of Personnel Management ordering them to reply with a set of bullet points justifying their work for the past week.

“Please reply to this email with approx. 5 bullets of what you accomplished last week and cc your manager,” the notice read. “Please do not send any classified information, links, or attachments. Deadline is this Monday at 11:59 p.m. EST.”

In a social media post Saturday, Musk said the directive came at the behest of President Trump, and that failure to respond would be taken as a resignation. Meanwhile, Bloomberg writes the Department of Justice has been urging employees to hold off replying out of concern doing so could trigger ethics violations. The National Treasury Employees Union also is advising its employees not to respond.

A legal battle over Trump’s latest executive order is bound to join more than 70 other lawsuits currently underway to halt the administration’s efforts to massively reduce the size of the federal workforce through layoffs, firings and attrition.

KING TRUMP?

On Feb. 15, the president posted on social media, “He who saves his Country does not violate any Law,” citing a quote often attributed to the French dictator Napoleon Bonaparte. Four days later, Trump referred to himself as “the king” on social media, while the White House nonchalantly posted an illustration of him wearing a crown.

Trump has been publicly musing about running for an unconstitutional third-term in office, a statement that some of his supporters dismiss as Trump just trying to rile his liberal critics. However, just days after Trump began his second term, Rep. Andy Ogles (R-Tenn.) introduced a bill to amend the Constitution so that Trump — and any other future president — can be elected to serve a third term.

This week at the Conservative Political Action Conference (CPAC), Rep. Ogles reportedly led a group of Trump supporters calling itself the “Third Term Project,” which is trying to gain support for the bill from GOP lawmakers. The event featured images of Trump depicted as Caesar.

Russia continues to be among the world’s top exporters of cybercrime, narcotics, money laundering, human trafficking, disinformation, war and death, and yet the Trump administration has suddenly broken with the Western world in normalizing relations with Moscow.

This week President Trump stunned U.S. allies by repeating Kremlin talking points that Ukraine is somehow responsible for Russia’s invasion, and that Ukrainian President Volodymyr Zelensky is a “dictator.” The president repeated these lies even as his administration is demanding that Zelensky give the United States half of his country’s mineral wealth in exchange for a promise that Russia will cease its territorial aggression there.

President Trump’s servility toward an actual dictator — Russian President Vladimir Putin — does not bode well for efforts to improve the cybersecurity of U.S. federal IT networks, or the private sector systems on which the government is largely reliant. In addition, this administration’s baffling moves to alienate, antagonize and sideline our closest allies could make it more difficult for the United States to secure their ongoing cooperation in cybercrime investigations.

It’s also startling how closely DOGE’s approach so far hews to tactics typically employed by ransomware gangs: A group of 20-somethings with names like “Big Balls” shows up on a weekend and gains access to your servers, deletes data, locks out key staff, takes your website down, and prevents you from serving customers.

When the federal executive starts imitating ransomware playbooks against its own agencies while Congress largely gazes on in either bewilderment or amusement, we’re in four-alarm fire territory. At least in theory, one can negotiate with ransomware purveyors.