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A new ransomware family that emerged last month comes with its own bag of tricks to bypass ransomware protection by leveraging a novel technique called "intermittent encryption." Called  LockFile , the operators of the ransomware have been found exploiting recently disclosed flaws such as  ProxyShell  and  PetitPotam  to compromise Windows servers and deploy file-encrypting malware that scrambles only every alternate 16 bytes of a file, thereby giving it the ability to evade ransomware defences. "Partial encryption is generally used by ransomware operators to speed up the encryption process and we've seen it implemented by BlackMatter, DarkSide and LockBit 2.0 ransomware," Mark Loman, Sophos director of engineering, said in a statement. "What sets LockFile apart is that, unlike the others, it doesn't encrypt the first few blocks. Instead, LockFile encrypts every other 16 bytes of a document." "This means that a file such as a text documen...

Microsoft is warning of a widespread credential phishing campaign that leverages  open redirector links  in email communications as a vector to trick users into visiting malicious websites while effectively bypassing security software. "Attackers combine these links with social engineering baits that impersonate well-known productivity tools and services to lure users into clicking," Microsoft 365 Defender Threat Intelligence Team  said  in a report published this week. "Doing so leads to a series of redirections — including a CAPTCHA verification page that adds a sense of legitimacy and attempts to evade some automated analysis systems — before taking the user to a fake sign-in page. This ultimately leads to credential compromise, which opens the user and their organization to other attacks." Although redirect links in email messages serve a vital tool to take recipients to third-party websites or track click rates and measure the success of sales and marketin...

Google and Microsoft said they are pledging to invest a total of $30 billion in cybersecurity advancements over the next five years, as the U.S. government  partners  with private sector companies to address threats facing the country in the wake of a string of sophisticated malicious cyber activity targeting critical infrastructure, laying bare the risks to data, organizations, and governments worldwide. The White House cybersecurity meeting, which brought together executives from the education, energy, finance, insurance, and tech sectors, included companies like ADP, Amazon, Apple, Bank of America, Code.org, Girls Who Code, Google, IBM, JPMorgan Chase, Microsoft, and Vantage Group, among others. To that end, the U.S. government on Wednesday announced a collaboration between the National Institute of Standards and Technology (NIST) and industry partners to develop a new framework to improve the security and integrity of the technology supply chain, alongside plans to exp...

U.S. technology firm Kaseya has  released  security patches to address two zero-day vulnerabilities affecting its Unitrends enterprise backup and continuity solution that could result in privilege escalation and authenticated remote code execution. The two weaknesses are part of a  trio of vulnerabilities  discovered and reported by researchers at the Dutch Institute for Vulnerability Disclosure (DIVD) on July 3, 2021. The IT infrastructure management solution provider has addressed the issues in server software version 10.5.5-2 released on August 12, DIVD said. An as-yet-undisclosed client-side vulnerability in Kaseya Unitrends remains unpatched, but the company has published  firewall rules  that can be applied to filter traffic to and from the client and mitigate any risk associated with the flaw. As an additional precaution, it's  recommended  not to leave the servers accessible over the internet. Although specifics related to the vulnera...

Cloud infrastructure security company Wiz on Thursday revealed details of a now-fixed Azure Cosmos database vulnerability that could have been potentially exploited to grant any Azure user full admin access to other customers' database instances without any authorization. The flaw, which grants read, write, and delete privileges, has been dubbed " ChaosDB ," with Wiz researchers noting that "the vulnerability has a trivial exploit that doesn't require any previous access to the target environment, and impacts thousands of organizations, including numerous Fortune 500 companies." Cosmos DB is Microsoft's proprietary  NoSQL database  that's advertised as "a fully managed service" that "takes database administration off your hands with automatic management, updates and patching." The Wiz Research Team reported the issue to Microsoft on August 12, after which the Windows maker took steps to mitigate the issue within 48 hours of r...

Today I discuss an attack vector conducive to cross-organizational spread, in-home local propagation. Though often overlooked, this vector is especially relevant today, as many corporate employees remain working from home. In this post, I contrast in-home local propagation with traditional vectors through which a threat (ransomware in particular) spreads throughout an organization. I discuss the reasons this type of spread is problematic for employees and corporations alike. Finally, I offer simple solutions to mitigate the risk of such tactics.  Why Should IT and Security Stakeholders Care? Today's long cycle attacks are often reconnoitering the victim environment for weeks, if not months. In this time, the attacker gains a tremendous amount of knowledge about systems in the victim's footprint. This additional loiter time in the victim's environment, coupled with ad-hoc maintained work-from-home environments, presents both an  ingress avenue  for attacks into their n...

Enterprise security and network appliance vendor F5 has released patches for more than  two dozen security vulnerabilities  affecting multiple versions of BIG-IP and BIG-IQ devices that could potentially allow an attacker to perform a wide range of malicious actions, including accessing arbitrary files, escalating privileges, and executing JavaScript code. Of the 29 bugs addressed, 13 are high-severity flaws, 15 are rated medium, and one is rated low in severity. Chief among them is  CVE-2021-23031  (CVSS score: 8.8), a vulnerability affecting BIG-IP Advanced Web Application Firewall and BIG-IP Application Security Manager that allows an authenticated user to perform a privilege escalation. "When this vulnerability is exploited, an authenticated attacker with access to the Configuration utility can execute arbitrary system commands, create or delete files, and/or disable services. This vulnerability may result in complete system compromise," F5 said in its advis...