Exploring Statistical Measures to Predict URLs as Legitimate or Intrusive
Using frequency analysis, and training the model with honeypot data as well as log data from legitimate websites allows for a fairly simple and reliable triage of web server logs to identify possible malicious activity.
https://isc.sans.edu/diary/Exploring%20Statistical%20Measures%20to%20Predict%20URLs%20as%20Legitimate%20or%20Intrusive%20%5BGuest%20Diary%5D/31822
Critical Unexploitable Ivanti Vulnerability Exploited CVE-2025-22457
In February, Ivanti patched CVE-2025-22457. At the time, the vulnerability was not considered to be exploitable. Mandiant now published a blog disclosing that the vulnerability was exploited as soon as mid-march
https://cloud.google.com/blog/topics/threat-intelligence/china-nexus-exploiting-critical-ivanti-vulnerability/
WinRAR MotW Vulnerability CVE-2025-31334
WinRAR patched a vulnerability that would not apply the Mark of the Web correctly if a compressed file included symlinks. This may make it easier to trick a victim into executing code downloaded from a website.
https://nvd.nist.gov/vuln/detail/CVE-2025-31334
Microsoft Warns of Tax-Related Scam
With the US personal income tax filing deadline only about a week out, Microsoft warns of commonly deployed scams that they are observing related to income tax filings
https://www.microsoft.com/en-us/security/blog/2025/04/03/threat-actors-leverage-tax-season-to-deploy-tax-themed-phishing-campaigns/
Oracle Breach Update
https://www.bloomberg.com/news/articles/2025-04-02/oracle-tells-clients-of-second-recent-hack-log-in-data-stolen

Surge in Scans for Juniper t128 Default User
Lasst week, we dedtect a significant surge in ssh scans for the username t128 . This user is used by Juniper s Session Smart Routing, a product they acquired from 128 Technologies which is the reason for the somewhat unusual username.
https://isc.sans.edu/diary/Surge%20in%20Scans%20for%20Juniper%20%22t128%22%20Default%20User/31824
Vulnerable Verizon API Allowed for Access to Call Logs
An API Verizon offered to users of its call filtering application suffered from an authentication bypass vulnerability allowing users to access any Verizon user s call history. While using a JWT to authenticate the user, the phone number used to retrieve the call history logs was passed in a not-authenticated header.
https://evanconnelly.github.io/post/hacking-call-records/
Google Offering End-to-End Encryption to G-Mail Business Users
Google will add an end-to-end encryption feature to commercial GMail users. However, for non GMail users to read the emails they first must click on a link and log in to Google.
https://workspace.google.com/blog/identity-and-security/gmail-easy-end-to-end-encryption-all-businesses

Apple Patches Everything
Apple released updates for all of its operating systems. Most were released on Monday with WatchOS patches released today on Tuesday. Two already exploited vulnerabilities, which were already patched in the latest iOS and macOS versions, are now patched for older operating systems as well. A total of 145 vulnerabilities were patched.
https://isc.sans.edu/diary/Apple%20Patches%20Everything%3A%20March%2031st%202025%20Edition/31816
VMWare Workstation and Fusion update check broken
VMWare s automatic update check in its Workstation and Fusion products is currently broken due to a redirect added as part of the Broadcom transition
https://community.broadcom.com/vmware-cloud-foundation/question/certificate-error-is-occured-during-connecting-update-server
NIM Postgres Vulnerability
NIM Developers using prepared statements to send SQL queries to Postgres may expose themselves to a SQL injection vulnerability. NIM s Postgres library does not appear to use actual prepared statements; instead, it assembles the code and the user data as a string and passes them on to the database. This may lead to a SQL injection vulnerability
https://blog.nns.ee/2025/03/28/nim-postgres-vulnerability/

Apache Camel Exploit Attempt by Vulnerability Scans
A recently patched vulnerability in Apache Camel has been integrated into some vulnerability scanners, like for example OpenVAS. We do see some exploit attempts in our honeypots, but they appear to be part of internal vulnerablity scans
https://isc.sans.edu/diary/Apache%20Camel%20Exploit%20Attempt%20by%20Vulnerability%20Scan%20%28CVE-2025-27636%2C%20CVE-2025-29891%29/31814
New Security Requirements for Certificate Authorities
Starting in July, certificate authorities need to verify domain ownership data from multiple viewpoints around the internet. They will also have to use linters to verify certificate requests.
https://security.googleblog.com/2025/03/new-security-requirements-adopted-by.html
Possible Oracle Breach
Oracle still denies being the victim of a data berach as leaked data may show different.
https://doublepulsar.com/oracle-attempt-to-hide-serious-cybersecurity-incident-from-customers-in-oracle-saas-service-9231c8daff4a
https://www.theregister.com/2025/03/30/infosec_news_in_brief/
https://www.darkreading.com/cyberattacks-data-breaches/oracle-still-denies-breach-researchers-persist

A Tale of Two Phishing Sties
Two phishing sites may use very different backends, even if the site itself appears to be visually very similar. Phishing kits are often copied and modified, leading to sites using similar visual tricks on the user facing site, but very different backends to host the sites and reporting data to the miscreant.
https://isc.sans.edu/diary/A%20Tale%20of%20Two%20Phishing%20Sites/31810
A Phihsing Tale of DOH and DNS MX Abuse
Infoblox discovered a new variant of the Meerkat phishing kit that uses DoH in Javascript to discover MX records, and generate better customized phishing pages.
https://blogs.infoblox.com/threat-intelligence/a-phishing-tale-of-doh-and-dns-mx-abuse/
Using OpenID Connect for SSH
Cloudflare opensourced it's OPKSSH too. It integrates SSO systems supporting OpenID connect with SSH.
https://github.com/openpubkey/opkssh/

Sitecore "thumbnailsaccesstoken" Deserialization Scans (and some new reports) CVE-2025-27218
Our honeypots detected a deserialization attack against the CMS Sitecore using a thumnailaccesstoken header. The underlying vulnerability was patched in January, and security firm Searchlight Cyber revealed details about this vulnerability a couple of weeks ago.
https://isc.sans.edu/diary/Sitecore%20%22thumbnailsaccesstoken%22%20Deserialization%20Scans%20%28and%20some%20new%20reports%29%20CVE-2025-27218/31806
Blasting Past Webp
Google s Project Zero revealed details how the NSO BLASTPASS exploit took advantage of a Webp image parsing vulnerability in iOS. This zero-click attack was employed in targeted attack back in 2023 and Apple patched the underlying vulnerability in September 2023. But this is the first byte by byte description showing how the attack worked.
https://googleprojectzero.blogspot.com/2025/03/blasting-past-webp.html
Splunk Vulnerabilities
Splunk patched about a dozen of vulnerabilities. None of them are rated critical, but a vulnerability rated High allows authenticated users to execute arbitrary code.
https://advisory.splunk.com/
Firefox 0-day Patched
Mozilla patched a sandbox escape vulnerability that is already being exploited.
https://www.mozilla.org/en-US/security/advisories/mfsa2025-19/

Leveraging CNNs and Entropy-Based Feature Selection to Identify Potential Malware Artifacts of Interest
This diary explores a novel methodology for classifying malware by integrating entropy-driven feature selection with a specialized Convolutional Neural Network (CNN). Motivated by the increasing obfuscation tactics used by modern malware authors, we will focus on capturing high-entropy segments within files, regions most likely to harbor malicious functionality, and feeding these distinct byte patterns into our model.
https://isc.sans.edu/diary/%5BGuest%20Diary%5D%20Leveraging%20CNNs%20and%20Entropy-Based%20Feature%20Selection%20to%20Identify%20Potential%20Malware%20Artifacts%20of%20Interest/31790

Malware found on npm infecting local package with reverse shell
Researchers at Reversinglabs found two malicious NPM packages, ethers-provider2, and ethers-providerz that patch the well known (and not malicious) ethers package to add a reverse shell and downloader.
https://www.reversinglabs.com/blog/malicious-npm-patch-delivers-reverse-shell
Google Patched Google Chrome 0-day
Google patched a vulnerability in Chrome that was already exploited in attacks against media and educational organizations in Russia
https://chromereleases.googleblog.com/2025/03/stable-channel-update-for-desktop_25.html

XWiki Search Vulnerablity Exploit Attempts (CVE-2024-3721)
Our honeypot detected an increase in exploit attempts for an XWiki command injection vulnerablity. The vulnerability was patched last April, but appears to be exploited more these last couple days. The vulnerability affects the search feature and allows the attacker to inject Groovy code templates.
https://isc.sans.edu/diary/X-Wiki%20Search%20Vulnerability%20exploit%20attempts%20%28CVE-2024-3721%29/31800
Correction: FBI Image Converter Warning
The FBI's Denver office warned of online file converters, not downloadable conversion tools
https://www.fbi.gov/contact-us/field-offices/denver/news/fbi-denver-warns-of-online-file-converter-scam
VMWare Vulnerability
Broadcom released a fix for a VMWare Tools vulnerability. The vulnerability allows users of a Windows virtual machine to escalate privileges within the machine.
https://support.broadcom.com/web/ecx/support-content-notification/-/external/content/SecurityAdvisories/0/25518
Draytek Reboots
Over the weekend, users started reporting Draytek routers rebooting and getting stuck in a reboot loop. Draytek now published advise as to how to fix the problem.
https://faq.draytek.com.au/docs/draytek-routers-rebooting-how-to-solve-this-issue/
Microsoft Managemnt Console Exploit CVE-2025-26633
TrendMicro released details showing how the MMC vulnerability Microsoft patched as part of its patch tuesday this month was exploited.
https://www.trendmicro.com/en_us/research/25/c/cve-2025-26633-water-gamayun.html

Privacy Aware Bots
A botnet is using privacy as well as CSRF prevention headers to better blend in with normal browsers. However, in the process they may make it actually easier to spot them.
https://isc.sans.edu/diary/Privacy%20Aware%20Bots/31796
Critical Ingress Nightmare Vulnerability
ingress-nginx fixed four new vulnerabilities, one of which may lead to a Kubernetes cluster compromise. Note that at the time I am making this live, not all of the URLs below are available yet, but I hope they will be available shortly after publishing this podcast
https://www.darkreading.com/application-security/critical-ingressnightmare-vulns-kubernetes-environments
https://www.wiz.io/blog/ingress-nginx-kubernetes-vulnerabilities
https://kubernetes.io/blog/
FBI Warns of File Converter Scams
File converters may include malicious ad ons. Be careful where you get your software from.
https://www.fbi.gov/contact-us/field-offices/denver/news/fbi-denver-warns-of-online-file-converter-scam
VSCode Extension Includes Ransomware
https://x.com/ReversingLabs/status/1902355043065500145

Critical Next.js Vulnerability CVE-2025-29927
A critical vulnerability in how the x-middleware-subrequest header is verified may lead to bypassing authorization in Next.js applications.
https://zhero-web-sec.github.io/research-and-things/nextjs-and-the-corrupt-middleware
https://github.com/vercel/next.js/security/advisories/GHSA-f82v-jwr5-mffw
https://www.runzero.com/blog/next-js/
Microsoft Trust Signing Service Abused
Attackers abut the Microsoft Trust Signing Service, a service meant to help developers create signed software, to obtain short lived signatures for malware.
https://www.bleepingcomputer.com/news/security/microsoft-trust-signing-service-abused-to-code-sign-malware/