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Nearly 2,000 Citrix NetScaler instances have been compromised with a backdoor by weaponizing a recently disclosed critical security vulnerability as part of a large-scale attack. "An adversary appears to have exploited CVE-2023-3519 in an automated fashion, placing web shells on vulnerable NetScalers to gain persistent access," NCC Group  said  in an advisory released Tuesday. "The adversary can execute arbitrary commands with this webshell, even when a NetScaler is patched and/or rebooted." CVE-2023-3519 refers to a critical code injection vulnerability impacting NetScaler ADC and Gateway servers that could lead to unauthenticated remote code execution. It was patched by Citrix last month. The development comes a week after the Shadowserver Foundation  said  it identified close to 7,000 vulnerable, unpatched NetScaler ADC and Gateway instances online and the flaw is being abused to drop PHP web shells on vulnerable servers for remote access. A follow-up anal...

Threat actors' use of Cloudflare R2 to host phishing pages has witnessed a 61-fold increase over the past six months. "The majority of the phishing campaigns target Microsoft login credentials, although there are some pages targeting Adobe, Dropbox, and other cloud apps," Netskope security researcher Jan Michael  said . Cloudflare R2 , analogous to Amazon Web Service S3, Google Cloud Storage, and Azure Blob Storage, is a data storage service for the cloud. The development comes as the total number of cloud apps from which malware downloads originate has  increased to 167 , with Microsoft OneDrive, Squarespace, GitHub, SharePoint, and Weebly taking the top five spots. The phishing campaigns identified by Netskope not only abuse Cloudflare R2 to distribute static phishing pages, but also leverage the company's  Turnstile  offering, a CAPTCHA replacement, to place such pages behind anti-bot barriers to evade detection. In doing so, it prevents online scanners lik...

Is your organization constantly under threat from credential phishing? Even with comprehensive security awareness training, many employees still fall victim to credential phishing scams. The result? Cybercriminals gaining immediate and unhindered access to sensitive data, email accounts, and other applications. But what if you could outsmart these criminals and protect your organization? Join  Graham Cluley , renowned cybersecurity expert and host of the Smashing Security podcast, and  Mike Britton , CISO at Abnormal Security, for an illuminating webinar that delves into the world of credential phishing and offers actionable insights. What Will You Learn? Understanding the Lure:  How attackers manipulate victims into submitting credentials, employing tactics such as generative AI. Why Victims Fall for the Trap:  A detailed look at why security awareness training may not always succeed in preventing employees from taking the bait. Effective Strategies to Comb...

Four security vulnerabilities in the ScrutisWeb ATM fleet monitoring software made by Iagona could be exploited to remotely break into ATMs, upload arbitrary files, and even reboot the terminals. The shortcomings were  discovered  by the Synack Red Team (SRT) following a client engagement. The issues have been addressed in ScrutisWeb version 2.1.38. "Successful exploitation of these vulnerabilities could allow an attacker to upload and execute arbitrary files," the U.S. Cybersecurity and Infrastructure Security Agency (CISA)  said  in an advisory published last month. ScrutisWeb  is a web browser-based solution for monitoring banking and retail ATM fleets, including gleaning information system status, detecting low paper alerts, shutting down or restarting a terminal, and remotely modifying data. Details of the four flaws are as follows - CVE-2023-33871  (CVSS score: 7.5) - A directory traversal vulnerability that could allow an unauthenticated user...

The threat actors behind the Monti ransomware have resurfaced after a two-month break with a new Linux version of the encryptor in its attacks targeting government and legal sectors. Monti  emerged  in June 2022, weeks after the Conti ransomware group shut down its operations, deliberately imitating the tactics and tools associated with the latter, including its leaked source code. Not anymore. The new version, per Trend Micro, is a departure of sorts, exhibiting significant changes from its other Linux-based predecessors. "Unlike the earlier variant, which is primarily based on the leaked Conti source code, this new version employs a different encryptor with additional distinct behaviors," Trend Micro researchers Nathaniel Morales and Joshua Paul Ignacio  said . A  BinDiff analysis  has revealed that while the older iterations had a 99% similarity rate with Conti, the latest version has only a 29% similarity rate, suggesting an overhaul. Some of the cruc...

The just-released BlackBerry Global Threat Intelligence Report reveals a 40% increase in cyberattacks against government and public service organizations versus the previous quarter. This includes public transit, utilities, schools, and other government services we rely on daily. With limited resources and often immature cyber defense programs, these publicly funded organizations are struggling against the double-pronged threat of attacks from both nation-states and the criminal underground.  These are just a few of the findings contained in the  latest edition  of BlackBerry's quarterly cybersecurity benchmarking guide. Covering events between March and May 2023, provides new information for the cybersecurity industry worldwide based on a detailed geopolitical analysis. BlackBerry observed and stopped 1.5 million attacks within the 90-day period.  Here are a few highlights in the report: 90 days by the numbers:  From March 2023 to May 2023, threat actors...