Keylogger Data Stored in an ADS Xavier came across a keystroke logger that stores data in alternate data streams. The data includes keystroke logs as well as clipboard data https://isc.sans.edu/diary/Keylogger%20Data%20Stored%20in%20an%20ADS/32108 Malvertising Homebrew An attacker has been attempting to trick users into installing a malicious version of Homebrew. The fake software Read More

DShield Honeypot Log Volume Increase Within the last few months, there has been a dramatic increase in honeypot log volumes and how often these high volumes are seen. This has not just been from Jesse s residential honeypot, which has historically seen higher log volumes, but from all of the Read More

Experimental Suspicious Domain Feed Our new experimental suspicious domain feed uses various criteria to identify domains that may be used for phishing or other malicious purposes. https://isc.sans.edu/diary/Experimental%20Suspicious%20Domain%20Feed/32102 Wing FTP Server RCE Vulnerability Exploited CVE-2025-47812 Huntress saw active exploitation of Wing FTP Server remote code execution (CVE-2025-47812) on a customer on Read More

SSH Tunneling in Action: direct-tcp requests Attackers are compromising ssh servers to abuse them as relays. The attacker will configure port forwarding direct-tcp connections to forward traffic to a victim. In this particular case, the Yandex mail server was the primary victim of these attacks. https://isc.sans.edu/diary/SSH%20Tunneling%20in%20Action%3A%20direct-tcp%20requests%20%5BGuest%20Diary%5D/32094 Fortiguard FortiWeb Unauthenticated SQL Read More

Setting up Your Own Certificate Authority for Development: Why and How. Some tips on setting up your own internal certificate authority using the smallstep CA. https://isc.sans.edu/diary/Setting%20up%20Your%20Own%20Certificate%20Authority%20for%20Development%3A%20Why%20and%20How./32092 Animation-Driven Tapjacking on Android Attackers can use a click-jacking like trick to trick victims into clicking on animated transparent dialogs opened from other applications. Read More

Microsoft Patch Tuesday, July 2025 Today, Microsoft released patches for 130 Microsoft vulnerabilities and 9 additional vulnerabilities not part of Microsoft's portfolio but distributed by Microsoft. 14 of these are rated critical. Only one of the vulnerabilities was disclosed before being patched, and none of the vulnerabilities have so far Read More

What s My File Name Malware may use the GetModuleFileName API to detect if it was renamed to a name typical for analysis, like sample.exe or malware.exe https://isc.sans.edu/diary/What%27s%20My%20%28File%29Name%3F/32084 Atomic macOS infostealer adds backdoor for persistent attacks Malware analyst discovered a new version of the Atomic macOS info-stealer (also known as Read More

Interesting ssh/telnet usernames Some interesting usernames observed in our honeypots https://isc.sans.edu/diary/A%20few%20interesting%20and%20notable%20ssh%20telnet%20usernames/32080 More sudo trouble The host option in Sudo can be exploited to execute commands on unauthorized hosts. https://www.stratascale.com/vulnerability-alert-CVE-2025-32462-sudo-host CitrixBleed2 PoC Posted (CVE-2025-5777) WatchTwer published additional details about the recently patched CitrixBleed vulnerability, including a PoC exploit. https://labs.watchtowr.com/how-much-more-must-we-bleed-citrix-netscaler-memory-disclosure-citrixbleed-2-cve-2025-5777/ Instagram Using Read More

Sudo chroot Elevation of Privilege The sudo chroot option can be leveraged by any local user to elevate privileges to root, even if no sudo rules are defined for that user. https://www.stratascale.com/vulnerability-alert-CVE-2025-32463-sudo-chroot Polymorphic ZIP Files A zip file with a corrupt End of Central Directory Record may extract different data Read More

Scattered Spider Update The threat actor known as Scattered Spider is in the news again, this time focusing on airlines. But the techniques used by Scattered Spider, social engineering, are still some of the most dangerous techniques used by various threat actors. https://cloud.google.com/blog/topics/threat-intelligence/unc3944-proactive-hardening-recommendations?e=48754805 AMI BIOS Vulnerability Exploited CVE-2024-54085 A vulnerability Read More

Open-VSX Flaw Puts Developers at Risk A flaw in the open-vsx extension marketplace could have let to the compromise of any extension offered by the marketplace. https://blog.koi.security/marketplace-takeover-how-we-couldve-taken-over-every-developer-using-a-vscode-fork-f0f8cf104d44 Bluetooth Vulnerability Could Allow Eavesdropping A vulnerability in the widely used Airoha Bluetooth chipset can be used to compromise devices and use them Read More

NetScaler ADC and NetScaler Gateway Security Bulletin for CVE-2025-6543 Citrix patched a memory overflow vulnerability leading to unintended control flow and denial of service. https://support.citrix.com/support-home/kbsearch/article?articleNumber=CTX694788 Remote code execution in CentOS Web Panel - CVE-2025-48703 An arbitrary file upload vulnerability in the user (not admin) part of Web Panel can be Read More

Quick Password Brute Forcing Evolution Statistics After collecting usernames and passwords from our ssh and telnet honeypots for about a decade, I took a look back at how scans changed. Attackers are attempting more passwords in each scans than they used to, but the average length of passwords did not Read More

Scans for Ichano AtHome IP Cameras A couple days ago, a few sources started scanning for the username super_yg and the password 123. This is associated with Ichano IP Camera software. https://isc.sans.edu/diary/Scans%20for%20Ichano%20AtHome%20IP%20Cameras/32062 Critical Netscaler Security Update CVE-2025-5777 CVE 2025-5777 is a critical severity vulnerability impacting NetScaler Gateway, i.e. if NetScaler Read More

ADS & Python Tools Didier explains how to use his tools cut-bytes.py and filescanner to extract information from alternate data streams. https://isc.sans.edu/diary/ADS%20%26%20Python%20Tools/32058 Enhanced security defaults for Windows 365 Cloud PCs Microsoft announced more secure default configurations for its Windows 365 Cloud PC offerings. https://techcommunity.microsoft.com/blog/windows-itpro-blog/enhanced-security-defaults-for-windows-365-cloud-pcs/4424914 CVE-2025-34508: Another File Sharing Application, Another Read More

How Long Until the Phishing Starts? About Two Weeks After setting up a Google Workspace and adding a new user, it took only two weeks for the new employee to receive somewhat targeted phishing emails. https://isc.sans.edu/diary/How%20Long%20Until%20the%20Phishing%20Starts%3F%20About%20Two%20Weeks/32052 Scammers hijack websites of Bank of America, Netflix, Microsoft, and more to insert fake Read More

Extracting Data From JPEGs Didier shows how to efficiently extract data from JPEGs using his tool jpegdump.py https://isc.sans.edu/diary/A%20JPEG%20With%20A%20Payload/32048 Windows Recall Export in Europe In its latest insider build for Windows 11, Microsoft is testing an export feature for data stored by Recall. The feature is limited to European users and Read More

Katz Stealer in JPG Xavier found some multistage malware that uses an Excel Spreadsheet and an HTA file to load an image that includes embeded a copy of Katz stealer. https://isc.sans.edu/diary/More+Steganography/32044 https://unit42.paloaltonetworks.com/malicious-javascript-using-jsfiretruck-as-obfuscation/ JavaScript obfuscated with JSF*CK is being used on over 200,000 websites to direct victims to malware Expired Discord Read More

Automated Tools to Assist with DShield Honeypot Investigations https://isc.sans.edu/diary/Automated%20Tools%20to%20Assist%20with%20DShield%20Honeypot%20Investigations%20%5BGuest%20Diary%5D/32038 EchoLeak: Zero-Click Microsoft 365 Copilot Data Leak Microsoft fixed a vulnerability in Copilot that could have been abused to exfiltrate data from Copilot users. Copilot mishandled instructions an attacker included in documents inspected by Copilot and executed them. https://www.aim.security/lp/aim-labs-echoleak-blogpost Thunderbolt Vulnerability Read More

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 Read More