New Variant of Crypto Confidence Scam
Scammers are offering login credentials for what appears to be high value crypto coin accounts. However, the goal is to trick users into paying for expensive VIP memberships to withdraw the money.
https://isc.sans.edu/diary/New%20Variant%20of%20Crypto%20Confidence%20Scam/31968
Malicious Chrome Extensions
Malicious Chrome extensions mimick popular services like VPNs to trick users into installing them. Once installed, the extensions will exfiltrate browser secrets
https://dti.domaintools.com/dual-function-malware-chrome-extensions/
Malicious VS Code Extensions
Malicious Visual Studio Code extensions target crypto developers to trick them into installing them to exfiltrate developer secrets.
https://securitylabs.datadoghq.com/articles/mut-9332-malicious-solidity-vscode-extensions/#indicators-of-compromise

Researchers Scanning the Internet
A newish RFC, RFC 9511, suggests researchers identify themselves by adding strings to the traffic they send, or by operating web servers on machines from which the scan originates. We do offer lists of researchers and just added three new groups today
https://isc.sans.edu/diary/Researchers%20Scanning%20the%20Internet/31964
Cloudy with a change of Hijacking: Forgotten DNS Records
Organizations do not always remove unused CNAME records. An attacker may take advantage of this if an attacker is able to take possession of the now unused public cloud resource the name pointed to.
https://blogs.infoblox.com/threat-intelligence/cloudy-with-a-chance-of-hijacking-forgotten-dns-records-enable-scam-actor/
Message signature verification can be spoofed CVE-2025-47934
A vulnerability in openpgp.js may be used to spoof message signatures. openpgp.js is a popular library in systems implementing end-to-end encrypted browser applications.
https://github.com/openpgpjs/openpgpjs/security/advisories/GHSA-8qff-qr5q-5pr8

RAT Dropped By Two Layers of AutoIT Code
Xavier explains how AutoIT was used to install a remote admin tool (RAT) and how to analyse such a tool
https://isc.sans.edu/diary/RAT%20Dropped%20By%20Two%20Layers%20of%20AutoIT%20Code/31960
RVTools compromise confirmed
Robware.net, the site behind the popular tool RVTools now confirmed that it was compromised. The site is currently offline.
https://www.robware.net/readMore
Trojaned Version of Keepass used to install info stealer and Cobalt Strike beacon
A backdoored version of KeePass was used to trick victims into installing Cobalt Strike and other malware. In this case, Keepass itself was not compromised and the malicious version was advertised via search engine optimization tricks
https://labs.withsecure.com/publications/keepass-trojanised-in-advanced-malware-campaign
Procolored UV Printer Software Compromised
The official software offered by the makers of the Procolored UV printer has been compromised, and versions with malware were distributed for about half a year.
https://www.hackster.io/news/the-maker-s-toolbox-procolored-v11-pro-dto-uv-printer-review-680d491e17e3
https://www.gdatasoftware.com/blog/2025/05/38200-printer-infected-software-downloads

xorsearch.py: Python Functions
Didier s xorsearch tool now supports python functions to filter output
https://isc.sans.edu/diary/xorsearch.py%3A%20Python%20Functions/31858
Pwn2Own Berlin 2025
Last weeks Pwn2Own contest in Berlin allowed researchers to demonstrate a number of new exploits with a large focus on privilege escalation and virtual machine escape.
https://www.zerodayinitiative.com/blog/2025/5/17/pwn2own-berlin-2025-day-three-results
Senior US Officials Impersonated in Malicious Messaging Campaign
The FBI warns of senior US officials being impersonated in text and voice messages.
https://www.ic3.gov/PSA/2025/PSA250515
Scattered Spider: TTP Evolution in 2025
Pushscurity provided an update on how Scattered Spider evolved. One thing they noted was that Scattered Spider takes advantage of legit dynamic domain name systems to make detection more difficult
https://pushsecurity.com/blog/scattered-spider-ttp-evolution-in-2025/

Web Scanning SonicWall for CVE-2021-20016 - Update
Scans for SonicWall increased by an order of magnitude over the last couple of weeks. Many of the attacks appear to originate from Global Host , a low-cost virtual hosting provider.
https://isc.sans.edu/diary/Web%20Scanning%20SonicWall%20for%20CVE-2021-20016%20-%20Update/31952
Google Update Patches Exploited Chrome Flaw
Google released an update for Chrome. The update fixes two specific flaws reported by external researchers, CVE-2025-4664 and CVE-2025-4609. The first flaw is already being exploited in the wild.
https://chromereleases.googleblog.com/2025/05/stable-channel-update-for-desktop_14.html
https://x.com/slonser_/status/1919439373986107814
RVTools Bumblebee Malware Attack
Zerodaylabs published its analysis of the RV-Tools Backdoor attack. It suggests that this may not be solely a search engine optimization campaign directing victims to the malicious installer, but that the RVTools distribution site was compromised.
https://zerodaylabs.net/rvtools-bumblebee-malware/
Operation RoundPress
ESET Security wrote up a report summarizing recent XSS attacks against open-source webmail systems
https://www.welivesecurity.com/en/eset-research/operation-roundpress/

Another day, another phishing campaign abusing google.com open redirects
Google s links from it s maps page to hotel listings do suffer from an open redirect vulnerability that is actively exploited to direct users to phishing pages.
https://isc.sans.edu/diary/Another%20day%2C%20another%20phishing%20campaign%20abusing%20google.com%20open%20redirects/31950
Adobe Patches
Adobe patched 12 different applications. Of particular interest is the update to ColdFusion, which fixes several arbitrary code execution and arbitrary file read problems.
https://helpx.adobe.com/security/security-bulletin.html
Samsung Patches magicInfo 9 Again
Samsung released a new patch for the already exploited magicInfo 9 CMS vulnerability. While the description is identical to the patch released last August, a new CVE number is used.
https://security.samsungtv.com/securityUpdates#SVP-MAY-2025
Ivanti Patches Critical Ivanti Neurons Flaw
Ivanti released a patch for Ivanti Neurons for ITSM (on-prem only) fixing a critical authentication bypass vulnerability. Ivanti also points to its guidance to secure the underlying IIS server to make exploitation of flaws like this more difficult

Microsoft Patch Tuesday
Microsoft patched 70-78 vulnerabilities (depending on how you count them). Five of these vulnerabilities are already being exploited. In particular, a remote code execution vulnerability in the scripting engine should be taken seriously. It requires the Microsoft Edge browser to run in Internet Explorer mode.
https://isc.sans.edu/diary/Microsoft%20Patch%20Tuesday%3A%20May%202025/31946
Security Advisory Ivanti Endpoint Manager Mobile (EPMM) May 2025 (CVE-2025-4427 and CVE-2025-4428)
Ivanti patched an authentication bypass vulnerability and a remote code execution vulnerability. The authentication bypass can exploit the remote code execution vulnerability without authenticating first.
https://forums.ivanti.com/s/article/Security-Advisory-Ivanti-Endpoint-Manager-Mobile-EPMM?language=en_US
Fortinet Patches Exploited Vulnerability in API (CVE-2025-32756)
Fortinet patched an already exploited stack-based buffer overflow vulnerability in the API of multiple Fortinet products. The vulnerability is exploited via crafted HTTP requests.
https://fortiguard.fortinet.com/psirt/FG-IR-25-254

Apple Updates Everything
Apple patched all of its operating systems. This update ports a patch for a recently exploited vulnerability to older versions of iOS and macOS.
https://isc.sans.edu/diary/31942
It Is 2025, And We Are Still Dealing With Default IoT Passwords And Stupid 2013 Router Vulnerabilities
Versions of the Mirai botnet are attacking devices made by Unipi Technology. These devices are using a specific username and password combination. In addition, this version of the Mirai botnet will also attempt exploits against an old Netgear vulnerability.
https://isc.sans.edu/diary/It%20Is%202025%2C%20And%20We%20Are%20Still%20Dealing%20With%20Default%20IoT%20Passwords%20And%20Stupid%202013%20Router%20Vulnerabilities/31940
Output Messenger Vulnerability
The internal messenger application Output Messenger is currently used in sophisticated attacks. Attackers are exploiting a path traversal vulnerability that has not been fixed.
https://www.outputmessenger.com/cve-2025-27920/
Commvault Correction
Commvault s patch indeed fixes the recent vulnerability. The Pioneer Release Will Dormann used to experiment will only offer patches after it has been registered, which leads to an error when assessing the patch s efficacy.
https://www.darkreading.com/application-security/commvault-patch-works-as-intended

Steganography Challenge
Didier revealed the solution to last weekend s cryptography challenge. The image used the same encoding scheme as Didier described before, but the columns and rows were transposed.
https://isc.sans.edu/forums/diary/Steganography%20Challenge%3A%20My%20Solution/31912/
FBI Warns of End-of-life routers
The FBI is tracking larger botnets taking advantage of unpatched routers. Many of these routers are end-of-life, and no patches are available for the exploited vulnerabilities. The attackers are turning the devices into proxies, which are resold for various criminal activities.
https://www.ic3.gov/PSA/2025/PSA250507
ASUS Driverhub Vulnerability
ASUS Driverhub software does not properly check the origin of HTTP requests, allowing a CSRF attack from any website leading to arbitrary code execution.
https://mrbruh.com/asusdriverhub/
RV-Tools SEO Poisoning
Varonis Threat Labs observed SEO poisoning being used to trick system administrators into installing a malicious version of RV Tools. The malicious version includes a remote access tool leading to the theft of credentials
https://www.varonis.com/blog/seo-poisoning#initial-access-and-persistence

No Internet Access: SSH to the Rescue
If faced with restrictive outbound network access policies, a single inbound SSH connection can quickly be turned into a tunnel or a full-blown VPN
https://isc.sans.edu/diary/No%20Internet%20Access%3F%20SSH%20to%20the%20Rescue!/31932
SAMSUNG magicINFO 9 Server Flaw Still exploitable
The SAMSUNG magicINFO 9 Server Vulnerability we found being exploited last week is apparently still not completely patched, and current versions are vulnerable to the exploit observed in the wild.
https://www.huntress.com/blog/rapid-response-samsung-magicinfo9-server-flaw
Bring Your Own Installer: Bypassing SentinelOne Through Agent Version Change Interruption
SentinelOne s installer is vulnerable to an exploit allowing attackers to shut down the end point protection software
https://www.aon.com/en/insights/cyber-labs/bring-your-own-installer-bypassing-sentinelone
Commvault Still Exploitable
A recent patch for Commvault is apparently ineffective and the PoC exploit published by watchTowr is still working against up to date patched systems
https://infosec.exchange/@wdormann/114458913006792356