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Critical Sharepoint 0-Day Vulnerablity Exploited CVE-2025-53770 (ToolShell), (Sun, Jul 20th)
Microsoft announced yesterday that a newly discovered critical remote code execution vulnerability in SharePoint is being exploited. There is no patch available. As a workaround, Microsoft suggests using Microsoft Defender to detect any attacks. To use Defender, you must first configure the AMSI integration to give Defender visibility into SharePoint. Recent versions of SharePoint have…
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Veeam Phishing via Wav File, (Fri, Jul 18th)
A interesting phishing attempt was reported by a contact. It started with a simple email that looked like a voice mail notification like many VoIP systems deliver when the call is missed. There was a WAV file attached to the mail[1]. Here is a transcript of the recording: “Hi, this is xxxx from Veeam Software.…
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ISC Stormcast For Friday, July 18th, 2025 https://isc.sans.edu/podcastdetail/9532, (Fri, Jul 18th)
(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.
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Hiding Payloads in Linux Extended File Attributes, (Thu, Jul 17th)
This week, it’s SANSFIRE[1]! I’m attending the FOR577[2] training (“Linux Incident Response & Threat Hunting”). On day 2, we covered the different filesystems and how data is organized on disk. In the Linux ecosystem, most filesystems (ext3, ext4, xfs, …) support “extended file attributes”, also called “xattr”. It’s a file system feature that enables users to…
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ISC Stormcast For Thursday, July 17th, 2025 https://isc.sans.edu/podcastdetail/9530, (Thu, Jul 17th)
(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.
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More Free File Sharing Services Abuse, (Wed, Jul 16th)
A few months ago, I wrote a diary about online services used to exfiltrate data[1]. In this diary, I mentioned some well-known services. One of them was catbox.moe[2]. Recently, I found a sample that was trying to download some payload from this website. I performed a quick research and collected more samples! I collected (and…
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ISC Stormcast For Wednesday, July 16th, 2025 https://isc.sans.edu/podcastdetail/9528, (Wed, Jul 16th)
(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.
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Keylogger Data Stored in an ADS, (Tue, Jul 15th)
If many malware samples try to be “filess” (read: they try to reduce their filesystem footprint to the bare minimum), another technique remains interesting: Alternate Data Streams or “ADS”[1]. This NTFS feature allows files to contain multiple data streams, enabling hidden or additional metadata to be stored alongside the main file content without being visible in…
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ISC Stormcast For Tuesday, July 15th, 2025 https://isc.sans.edu/podcastdetail/9526, (Tue, Jul 15th)
(c) SANS Internet Storm Center. https://isc.sans.edu Creative Commons Attribution-Noncommercial 3.0 United States License.
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DShield Honeypot Log Volume Increase, (Mon, Jul 14th)
The volume of honeypot logs changes over time. Very rarely are honeypot logs quiet, meaning that there are no internet scans or malicious activity generating logs. Honeypots can see large increases in activity [1], but this has tended to be the exception, rather than the rule. Within the last few months, however, there has been…
