Cloudflare Scrubs Aisuru Botnet from Top Domains List

For the past week, domains associated with the massive Aisuru botnet have repeatedly usurped Amazon , Apple , Google and Microsoft in Cloudflare's public ranking of the most frequently requested websites. Cloudflare responded by redacting Aisuru domain names from their top websites list. The chie...

Alleged Jabber Zeus Coder ‘MrICQ’ in U.S. Custody

A Ukrainian man indicted in 2012 for conspiring with a prolific hacking group to steal tens of millions of dollars from U.S. businesses was arrested in Italy and is now in custody in the United States, KrebsOnSecurity has learned. Sources close to the investigation say Yuriy Igorevich Rybtsov , a...

Aisuru Botnet Shifts from DDoS to Residential Proxies

Aisuru , the botnet responsible for a series of record-smashing distributed denial-of-service DDoS attacks this year, recently was overhauled to support a more low-key, lucrative and sustainable business: Renting hundreds of thousands of infected Internet of Things IoT devices to proxy services...

Canada Fines Cybercrime Friendly Cryptomus $176M

Financial regulators in Canada this week levied $176 million in fines against Cryptomus , a digital payments platform that supports dozens of Russian cryptocurrency exchanges and websites hawking cybercrime services. The penalties for violating Canada's anti money-laundering laws come ten months...

Email Bombs Exploit Lax Authentication in Zendesk

Cybercriminals are abusing a widespread lack of authentication in the customer service platform Zendesk to flood targeted email inboxes with menacing messages that come from hundreds of Zendesk corporate customers simultaneously. Zendesk is an automated help desk service designed to make it simpl...

Patch Tuesday, October 2025 ‘End of 10’ Edition

Microsoft today released software updates to plug a whopping 172 security holes in its Windows operating systems, including at least two vulnerabilities that are already being actively exploited. October's Patch Tuesday also marks the final month that Microsoft will ship security updates for...

DDoS Botnet Aisuru Blankets US ISPs in Record DDoS

The world's largest and most disruptive botnet is now drawing a majority of its firepower from compromised Internet-of-Things IoT devices hosted on U.S. Internet providers like AT &T, Comcast and Verizon , new evidence suggests. Experts say the heavy concentration of infected devices at U.S...

ShinyHunters Wage Broad Corporate Extortion Spree

A cybercriminal group that used voice phishing attacks to siphon more than a billion records from Salesforce customers earlier this year has launched a website that threatens to publish data stolen from dozens of Fortune 500 firms if they refuse to pay a ransom. The group also claimed...

Feds Tie ‘Scattered Spider’ Duo to $115M in Ransoms

U.S. prosecutors last week levied criminal hacking charges against 19-year-old U.K. national Thalha Jubair for allegedly being a core member of Scattered Spider , a prolific cybercrime group blamed for extorting at least $115 million in ransom payments from victims. The charges came as Jubair and...

Self-Replicating Worm Hits 180+ Software Packages

At least 187 code packages made available through the JavaScript repository NPM have been infected with a self-replicating worm that steals credentials from developers and publishes those secrets on GitHub , experts warn. The malware, which briefly infected multiple code packages from the securit...

Bulletproof Host Stark Industries Evades EU Sanctions

In May 2025, the European Union levied financial sanctions on the owners ofStark Industries Solutions Ltd. , a bulletproof hosting provider that materialized two weeks before Russia invaded Ukraine and quickly became a top source of Kremlin-linked cyberattacks and disinformation campaigns. But ne...

Microsoft Patch Tuesday, September 2025 Edition

Microsoft Corp. today issued security updates to fix more than 80 vulnerabilities in its Windows operating systems and software. There are no known "zero-day" or actively exploited vulnerabilities in this month's bundle from Redmond, which nevertheless includes patches for 13 flaws that earned...

18 Popular Code Packages Hacked, Rigged to Steal Crypto

At least 18 popular JavaScript code packages that are collectively downloaded more than two billion times each week were briefly compromised with malicious software today, after a developer involved in maintaining the projects was phished. The attack appears to have been quickly contained and was...

GOP Cries Censorship Over Spam Filters That Work

The chairman of the Federal Trade Commission FTC last week sent a letter to Google's CEO demanding to know why Gmail was blocking messages from Republican senders while allegedly failing to block similar missives supporting Democrats. The letter followed media reports accusing Gmail of...

The Ongoing Fallout from a Breach at AI Chatbot Maker Salesloft

The recent mass-theft of authentication tokens from Salesloft , whose AI chatbot is used by a broad swath of corporate America to convert customer interaction into Salesforce leads, has left many companies racing to invalidate the stolen credentials before hackers can exploit them. Now Google war...

Affiliates Flock to ‘Soulless’ Scam Gambling Machine

Last month, KrebsOnSecurity tracked the sudden emergence of hundreds of polished online gaming and wagering websites that lure people with free credits and eventually abscond with any cryptocurrency funds deposited by players. We've since learned that these scam gambling sites have proliferated...

DSLRoot, Proxies, and the Threat of ‘Legal Botnets’

The cybersecurity community on Reddit responded in disbelief this month when a self-described Air National Guard member with top secret security clearance began questioning the arrangement they'd made with company called DSLRoot , which was paying $250 a month to plug a pair of laptops into the...

SIM-Swapper, Scattered Spider Hacker Gets 10 Years

A 20-year-old Florida man at the center of a prolific cybercrime group known as "Scattered Spider " was sentenced to 10 years in federal prison today, and ordered to pay roughly $13 million in restitution to victims. Noah Michael Urban of Palm Coast, Fla. pleaded guilty in April 2025 to charges o...

Oregon Man Charged in ‘Rapper Bot’ DDoS Service

A 22-year-old Oregon man has been arrested on suspicion of operating "Rapper Bot ," a massive botnet used to power a service for launching distributed denial-of-service DDoS attacks against targets -- including a March 2025 DDoS that knocked Twitter/X offline. The Justice Department asserts the...

Mobile Phishers Target Brokerage Accounts in ‘Ramp and Dump’ Cashout Scheme

Cybercriminal groups peddling sophisticated phishing kits that convert stolen card data into mobile wallets have recently shifted their focus to targeting customers of brokerage services, new research shows. Undeterred by security controls at these trading platforms that block users from wiring...

Microsoft Patch Tuesday, August 2025 Edition

Microsoft today released updates to fix more than 100 security flaws in its Windows operating systems and other software. At least 13 of the bugs received Microsoft's most-dire "critical" rating, meaning they could be abused by malware or malcontents to gain remote access to a Windows system with...

KrebsOnSecurity in New ‘Most Wanted’ HBO Max Series

A new documentary series about cybercrime airing next month on HBO Max features interviews with Yours Truly. The four-part series follows the exploits of Julius Kivimäki , a prolific Finnish hacker recently convicted of leaking tens of thousands of patient records from an online psychotherapy...

Who Got Arrested in the Raid on the XSS Crime Forum?

On July 22, 2025, the European police agency Europol said a long-running investigation led by the French Police resulted in the arrest of a 38-year-old administrator of XSS, a Russian-language cybercrime forum with more than 50,000 members. The action has triggered an ongoing frenzy of speculatio...

Scammers Unleash Flood of Slick Online Gaming Sites

Fraudsters are flooding Discord and other social media platforms with ads for hundreds of polished online gaming and wagering websites that lure people with free credits and eventually abscond with any cryptocurrency funds deposited by players. Here's a closer look at the social engineering tacti...

Phishers Target Aviation Execs to Scam Customers

KrebsOnSecurity recently heard from a reader whose boss's email account got phished and was used to trick one of the company's customers into sending a large payment to scammers. An investigation into the attacker's infrastructure points to a long-running Nigerian cybercrime ring that is actively...

Microsoft Fix Targets Attacks on SharePoint Zero-Day

On Sunday, July 20, Microsoft Corp. issued an emergency security update for a vulnerability in SharePoint Server that is actively being exploited to compromise vulnerable organizations. The patch comes amid reports that malicious hackers have used the SharePoint flaw to breach U.S. federal and...

Poor Passwords Tattle on AI Hiring Bot Maker Paradox.ai

Security researchers recently revealed that the personal information of millions of people who applied for jobs at McDonald 's was exposed after they guessed the password "123456" for the fast food chain's account at Paradox.ai , a company that makes artificial intelligence based hiring chatbots...

DOGE Denizen Marko Elez Leaked API Key for xAI

Marko Elez , a 25-year-old employee at Elon Musk's Department of Government Efficiency DOGE, has been granted access to sensitive databases at the U.S. Social Security Administration, the Treasury and Justice departments, and the Department of Homeland Security. So it should fill all Americans wi...

UK Arrests Four in ‘Scattered Spider’ Ransom Group

Authorities in the United Kingdom this week arrested four people aged 17 to 20 in connection with recent data theft and extortion attacks against the retailers Marks & Spencer and Harrods , and the British food retailer Co-op Group. The breaches have been linked to a prolific but loosely-affiliat...

Microsoft Patch Tuesday, July 2025 Edition

Microsoft today released updates to fix at least 137 security vulnerabilities in its Windows operating systems and supported software. None of the weaknesses addressed this month are known to be actively exploited, but 14 of the flaws earned Microsoft's most-dire "critical" rating, meaning they...

Big Tech’s Mixed Response to U.S. Treasury Sanctions

In May 2025, the U.S. government sanctioned a Chinese national for operating a cloud provider linked to the majority of virtual currency investment scam websites reported to the FBI. But a new report finds the accused continues to operate a slew of established accounts at American tech companies ...

Senator Chides FBI for Weak Advice on Mobile Security

Agents with the Federal Bureau of Investigation FBI briefed Capitol Hill staff recently on hardening the security of their mobile devices, after a contacts list stolen from the personal phone of the White House Chief of Staff Susie Wiles was reportedly used to fuel a series of text messages and...

Inside a Dark Adtech Empire Fed by Fake CAPTCHAs

Late last year, security researchers made a startling discovery: Kremlin-backed disinformation campaigns were bypassing moderation on social media platforms by leveraging the same malicious advertising technology that powers a sprawling ecosystem of online hucksters and website hackers. A new...

Patch Tuesday, June 2025 Edition

Microsoft today released security updates to fix at least 67 vulnerabilities in its Windows operating systems and software. Redmond warns that one of the flaws is already under active attack, and that software blueprints showing how to exploit a pervasive Windows bug patched this month are now...

Proxy Services Feast on Ukraine’s IP Address Exodus

Image: Mark Rademaker, via Shutterstock. Ukraine has seen nearly one-fifth of its Internet space come under Russian control or sold to Internet address brokers since February 2022, a new study finds. The analysis indicates large chunks of Ukrainian Internet address space are now in the hands of...

U.S. Sanctions Cloud Provider ‘Funnull’ as Top Source of ‘Pig Butchering’ Scams

Image: Shutterstock, ArtHead. The U.S. government today imposed economic sanctions on Funnull Technology Inc. , a Philippines-based company that provides computer infrastructure for hundreds of thousands of websites involved in virtual currency investment scams known as “pig butchering." In Janua...

Pakistan Arrests 21 in ‘Heartsender’ Malware Service

Authorities in Pakistan have arrested 21 individuals accused of operating "Heartsender ," a once popular spam and malware dissemination service that operated for more than a decade. The main clientele for HeartSender were organized crime groups that tried to trick victim companies into making...

Oops: DanaBot Malware Devs Infected Their Own PCs

The U.S. government today unsealed criminal charges against 16 individuals accused of operating and selling DanaBot , a prolific strain of information-stealing malware that has been sold on Russian cybercrime forums since 2018. The FBI says a newer version of DanaBot was used for espionage, and...

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 capabl...

Breachforums Boss to Pay $700k in Healthcare Breach

In what experts are calling a novel legal outcome, the 22-year-old former administrator of the cybercrime community Breachforums will forfeit nearly $700,000 to settle a civil lawsuit from a health insurance company whose customer data was posted for sale on the forum in 2023. Conor Brian...

Patch Tuesday, May 2025 Edition

Microsoft on Tuesday released software updates to fix at least 70 vulnerabilities in Windows and related products, including five zero-day flaws that are already seeing active exploitation. Adding to the sense of urgency with this month's patch batch from Redmond are fixes for two other weaknesse...

Pakistani Firm Shipped Fentanyl Analogs, Scams to US

A Texas firm recently charged with conspiring to distribute synthetic opioids in the United States is at the center of a vast network of companies in the U.S. and Pakistan whose employees are accused of using online ads to scam westerners seeking help with trademarks, book writing, mobile app...

xAI Dev Leaks API Key for Private SpaceX, Tesla LLMs

An employee at Elon Musk's artificial intelligence company xAI leaked a private key on GitHub that for the past two months could have allowed anyone to query private xAI large language models LLMs which appear to have been custom made for working with internal data from Musk's companies, includin...

Alleged ‘Scattered Spider’ Member Extradited to U.S.

A 23-year-old Scottish man thought to be a member of the prolific Scattered Spider cybercrime group was extradited last week from Spain to the United States, where he is facing charges of wire fraud, conspiracy and identity theft. U.S. prosecutors allege Tyler Robert Buchanan and co-conspirators...

DOGE Worker’s Code Supports NLRB Whistleblower

A whistleblower at the National Labor Relations Board NLRB alleged last week that denizens of Elon Musk's Department of Government Efficiency DOGE siphoned gigabytes of data from the agency's sensitive case files in early March. The whistleblower said accounts created for DOGE at the NLRB...

Whistleblower: DOGE Siphoned NLRB Case Data

A security architect with the National Labor Relations Board NLRB alleges that employees from Elon Musk 's Department of Government Efficiency DOGE transferred gigabytes of sensitive data from agency case files in early March, using short-lived accounts configured to leave few traces of network...

Funding Expires for Key Cyber Vulnerability Database

A critical resource that cybersecurity professionals worldwide rely on to identify, mitigate and fix security vulnerabilities in software and hardware is in danger of breaking down. The federally funded, non-profit research and development organization MITRE warned today that its contract to...

Trump Revenge Tour Targets Cyber Leaders, Elections

President Trump last week revoked security clearances for Chris Krebs , the former director of the Cybersecurity and Infrastructure Security Agency CISA who was fired by Trump after declaring the 2020 election the most secure in U.S. history. The White House memo, which also suspended clearances...

China-based SMS Phishing Triad Pivots to Banks

China-based purveyors of SMS phishing kits are enjoying remarkable success converting phished payment card data into mobile wallets from Apple and Google. Until recently, the so-called "Smishing Triad " mainly impersonated toll road operators and shipping companies. But experts say these groups a...

Patch Tuesday, April 2025 Edition

Microsoft today released updates to plug at least 121 security holes in its Windows operating systems and software, including one vulnerability that is already being exploited in the wild. Eleven of those flaws earned Microsoft's most-dire "critical" rating, meaning malware or malcontents could...