SANS Stormcast Thursday, June 12th, 2025: Quasar RAT; Windows 11 24H2 Delay; SMB Client Vuln PoC; Connectwise Signing Keys; KDE Telnet code exec Quasar RAT Delivered Through Bat Files Xavier is walking you through a quick reverse analysis of a script that will injection code extracted from a PNG image to implement a Quasar RAT. https://isc.sans.edu/diary/Quasar%20RAT%20Delivered%20Through%20Bat%20Files/32036 Delayed Windows 11 24H2 Rollout Microsoft slightly throttled the rollout of windows 11 24H2 due to issues stemming from the patch Tuesday fixes. https://learn.microsoft.com/en-us/windows/release-health/windows-message-center#3570 An In-Depth Analysis of CVE-2025-33073 Patch Tuesday fixed an already exploited SMB client vulnerability. A blog by Synacktiv explains the nature of the issue and how to exploit it. https://www.synacktiv.com/en/publications/ntlm-reflection-is-dead-long-live-ntlm-reflection-an-in-depth-analysis-of-cve-2025 Connectwise Rotating Signing Certificates Connectwise is rotating signing certificates after a recent compromise, and will release a new version of its Screen share software soon to harden its configuration. https://www.connectwise.com/company/trust/advisories KDE Telnet URL Vulnerablity The Konsole delivered as part of KDE may be abused to execute arbitrary code via “telnet” URLs. https://kde.org/info/security/advisory-20250609-1.txt keywords: kde; telnet; konsole; conectwise; SMB; windows; RAT; BAT; Quasar

SANS Stormcast Wednesday, June 11th, 2025: Microsoft Patch Tuesday; Acrobat Patches Microsoft Patch Tuesday Microsoft today released patches for 67 vulnerabilities. 10 of these vulnerabilities are rated critical. One vulnerability has already been exploited and another vulnerability has been publicly disclosed before today. https://isc.sans.edu/diary/Microsoft%20Patch%20Tuesday%20June%202025/32032 Adobe Vulnerabilities Adobe released patches for 7 different applications. Two significant ones are Adobe Commerce and Adobe Acrobat Reader. All vulnerabilities patched for Adobe Commerce can only be exploited by an authenticated user. The Adobe Acrobat Reader vulnerabilities are exploited by a user opening a crafted PDF, and the exploit may execute arbitrary code. https://helpx.adobe.com/security/Home.html keywords: microsoft; patches; tuesday; adobe; commerce; pdf; acrobat

SANS Stormcast June, Tuesday, June 10th, 2025: Octosql; Mirai vs. Wazuh DNS4EU; Wordpress Fair Package Manager OctoSQL & Vulnerability Data OctoSQL is a neat tool to query files in different formats using SQL. This can, for example, be used to query the JSON vulnerability files from CISA or NVD and create interesting joins between different files. https://isc.sans.edu/diary/OctoSQL+Vulnerability+Data/32026 Mirai vs. Wazuh The Mirai botnet has now been observed exploiting a vulnerability in the open-source EDR tool Wazuh. https://www.akamai.com/blog/security-research/botnets-flaw-mirai-spreads-through-wazuh-vulnerability DNS4EU The European Union created its own public recursive resolver to offer a public resolver compliant with European privacy laws. This resolver is currently operated by ENISA, but the intent is to have a commercial entity operate and support it by a commercial entity. https://www.joindns4.eu/ WordPress FAIR Package Manager Recent legal issues around different WordPress-related entities have made it more difficult to maintain diverse sources of WordPress plugins. With WordPress plugins usually being responsible for many of the security issues, the Linux Foundation has come forward to support the “FAIR Package Manager,” a tool intended to simplify the management of WordPress packages. https://github.com/fairpm keywords: Octosql; wazuh; mirai; dns4eu; dns; wordpress; fair;

SANS Stormcast June, June 9th, 2025: Extracting PNG Data; GlueStack Packages Backdoor; MacOS targeted by Clickfix; INETPUB restore script Extracting With pngdump.py Didier extended his pngdump.py script to make it easier to extract additional data appended to the end of the image file. https://isc.sans.edu/diary/Extracting%20With%20pngdump.py/32022 16 React Native Packages for GlueStack Backdoored Overnight 16 npm packages with over a million weekly downloads between them were compromised. The compromised packages include a remote admin tool that was seen before in similar attacks. https://www.aikido.dev/blog/supply-chain-attack-on-react-native-aria-ecosystem Atomic MacOS Stealer Exploits Clickfix MacOS users are now also targeted by fake captchas, tricking users into running exploit code. https://www.cloudsek.com/blog/amos-variant-distributed-via-clickfix-in-spectrum-themed-dynamic-delivery-campaign-by-russian-speaking-hackers Microsoft INETPUB Script Microsoft published a simple PowerShell script to restore the inetpub folder in case you removed it by mistake. https://www.powershellgallery.com/packages/Set-InetpubFolderAcl/1.0 keywords: microsoft; inetpub; atomix; amos; stealer; clickfix; gluestack; backdoor; pngdump.py

SANS Stormcast Friday, June 6th, 2025: Fake Zoom Clients; Python tarfile vulnerability; HPE Insight Remote Support Patch Be Careful With Fake Zoom Client Downloads Miscreants are tricking victims into downloading fake Zoom clients (and likely other meeting software) by first sending them fake meeting invites that direct victims to a page that offers malware for download as an “update” to the Zoom client. https://isc.sans.edu/diary/Be%20Careful%20With%20Fake%20Zoom%20Client%20Downloads/32014 Python tarfile Vulnerability Recently, the Python tarfile module introduced a “filter” option to help mitigate some of the insecure behavior common to software unpacking archives. This filter is, however, not working quite as well as it should. https://mail.python.org/archives/list/[email protected]/thread/MAXIJJCUUMCL7ATZNDVEGGHUMQMUUKLG/ Hewlett Packard Enterprise Insight Remote Support processAttachmentDataStream Directory Traversal Remote Code Execution Vulnerability HP fixed, among other vulnerabilities, a critical remote code execution vulnerability in Insight Remote Support (IRS) https://www.zerodayinitiative.com/advisories/ZDI-25-325/ keywords: hp; insight; remote; support; irs; python; tarfile; zoom;

SANS Stormcast Thursday, June 5th, 2025: Phishing Comment Trick; AWS default logging mode change; Cisco Backdoor Fixed; Infoblox Vulnerability Details Released Phishing e-mail that hides malicious links from Outlook users Jan found a phishing email that hides the malicious link from Outlook users. The email uses specific HTML comment clauses Outlook interprets to render or not render specific parts of the email’s HTML code. Jan suggests that the phishing email is intented to not expose users of  https://isc.sans.edu/diary/Phishing%20e-mail%20that%20hides%20malicious%20link%20from%20Outlook%20users/32010 Amazon changing default logging from blocking to non-blocking Amazon will change the default logging mode from blocking to non-blocking. Non-blocking logging will not stop the application if logging fails, but may result in a loss of logs. https://aws.amazon.com/blogs/containers/preventing-log-loss-with-non-blocking-mode-in-the-awslogs-container-log-driver/ Cisco Removes Backdoor Cisco fixed a Cisco Identity Services Engine on Cloud Platforms Static Credential Vulnerability. https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-ise-aws-static-cred-FPMjUcm7 Infoblox Vulnerability Details disclosed Details regarding several vulnerabilities recently patched in Infoblox’s NetMRI have been made public. In particular an unauthenticated remote code execution issue should be considered critical. https://rhinosecuritylabs.com/research/infoblox-multiple-cves/ keywords: infoblox; netmri; Cisco; backdoor; amazon; logging; outlook; phishing

SANS Stormcast Wednesday, June 4th, 2025: vBulletin Exploited; Chrome 0-Day Patch; Roundcube RCE Patch; Multiple HP StoreOnce Vulns Patched vBulletin Exploits CVE-2025-48827, CVE-2025-48828 We do see exploit attempts for the vBulletin flaw disclosed about a week ago. The flaw is only exploitable if vBulltin is run on PHP 8.1, and was patched over a year ago. However, vBulltin never disclosed the type of vulnerability that was patched. https://isc.sans.edu/diary/vBulletin%20Exploits%20%28CVE-2025-48827%2C%20CVE-2025-48828%29/32006 Google Chrome 0-Day Patched Google released a security update for Google Chrome patching three flaws. One of these is already being exploited. https://chromereleases.googleblog.com/ Roundcube Update Roundcube patched a vulnerability that allows any authenticated user to execute arbitrary code. https://roundcube.net/news/2025/06/01/security-updates-1.6.11-and-1.5.10 HP Vulnerabilities in StoreOnce HP patched multiple vulnerabilities in StoreOnce. These issues could lead to remote code execution https://support.hpe.com/hpesc/public/docDisplay?docId=hpesbst04847en_us&docLocale=en_US keywords: HP; roundcube; storeonce; google; chrome; 0-day; vBulletin

SANS Stormcast Tuesday, June 3rd, 2025: Windows SSH C2; Google Removes CAs from trusted list; MSFT issues Emergency Patch to fix Crash issue; Qualcom Adreno GPU 0-day Simple SSH Backdoor Xavier came across a simple SSH backdoor taking advantage of the ssh client preinstalled on recent Windows systems. The backdoor is implemented via an SSH configuration file that instructs the SSH client to connect to a remote system and forward a shell on a random port. This will make the shell accessible to anybody able to connect to the C2 host. https://isc.sans.edu/diary/Simple%20SSH%20Backdoor/32000 Google Chrome to Distrust CAs Google Chrome will remove the Chunghwa Telecom and Netlock certificate authorities from its list of trusted CAs. Any certificates issued after July 31st will not be trusted. Certificates issued before the deadline will be trusted until they expire. https://security.googleblog.com/2025/05/sustaining-digital-certificate-security-chrome-root-store-changes.html Microsoft Emergency Update to Fix Crashes Caused by May Patch Microsoft released an emergency update for a bug caused by one of the patches released in May. Due to the bug, systems may not restart after the patch is applied. This affects, first of all, virtual systems running in Azure and HyperV but apparently has also affected some physical systems. https://learn.microsoft.com/en-us/windows/release-health/status-windows-11-23h2#kb5058405-might-fail-to-install-with-recovery-error-0xc0000098-in-acpi-sys Qualcomm Adreno Graphics Processing Unit Patch (Exploited!) Qualcomm released an update for the driver for its Adreno GPU. The patched vulnerability is already being exploited against Android devices. https://docs.qualcomm.com/product/publicresources/securitybulletin/june-2025-bulletin.html keywords: qualcom; adreno; netlock; chungwa; ssh;

SANS Stormcast Monday, May 2nd, 2025: PNG with RAT; Cisco IOS XE WLC Exploit; vBulletin Exploit A PNG Image With an Embedded Gift Xavier shows how Python code attached to a PNG image can be used to implement a command and control channel or a complete remote admin kit. https://isc.sans.edu/diary/A+PNG+Image+With+an+Embedded+Gift/31998 Cisco IOS XE WLC Arbitrary File Upload Vulnerability (CVE-2025-20188) Analysis Horizon3 analyzed a recently patched flaw in Cisco Wireless Controllers. This arbitrary file upload flaw can easily be used to execute arbitrary code. https://horizon3.ai/attack-research/attack-blogs/cisco-ios-xe-wlc-arbitrary-file-upload-vulnerability-cve-2025-20188-analysis/ Don't Call That "Protected" Method: Dissecting an N-Day vBulletin RCE A change in PHP 8.1 can expose methods previously expected to be “safe”. vBulletin fixed a related flaw about a year ago without explicitly highlighting the security impact of the fix. A blog post now exposed the flaw and provided exploit examples. We have seen exploit attempts against honeypots starting May 25th, two days after the blog was published. https://karmainsecurity.com/dont-call-that-protected-method-vbulletin-rce keywords: vbulletin; php; exploit; cisco; wlc; png;

SANS Stormcast Friday, May 30th 2025: Alternate Data Streams; Connectwise Breach; Google Calendar C2; Alternate Data Streams: Adversary Defense Evasion and Detection Good Primer of alternate data streams and how they are abused, as well as how to detect and defend against ADS abuse. https://isc.sans.edu/diary/Alternate%20Data%20Streams%20%3F%20Adversary%20Defense%20Evasion%20and%20Detection%20%5BGuest%20Diary%5D/31990 Connectwise Breach Affects ScreenConnect Customers Connectwise’s ScreenConnect solution was compromised, leading to attacks against a small number of customers. This is yet another example of how attackers are taking advantage of remote access solutions. https://www.connectwise.com/company/trust/advisories Mark Your Calendar: APT41 Innovative Tactics Google detected attacks leveraging Google’s calendar solution as a command and control channel. https://cloud.google.com/blog/topics/threat-intelligence/apt41-innovative-tactics Webs of Deception: Using the SANS ICS Kill Chain to Flip the Advantage to the Defender Defending a small Industrial Control System (ICS) against sophisticated threats can seem futile. The resource disparity between small ICS defenders and sophisticated attackers poses a significant security challenge. https://www.sans.edu/cyber-research/webs-deception-using-sans-ics-kill-chain-flip-advantage-defender/ keywords: deceptoin; ics; apt41; google; calendar; connectwise; screenconnect; ads; alternate data streams;