SANS Stormcast Friday, September 26th, 2025: Webshells in .well-known; Critical Cisco Vulns Exploited; XCSSET Update; GoAnywhere MFT Exploit Details
Update: 2025-09-26
Description
Webshells Hiding in .well-known Places
Our honeypots registered an increase in scans for URLs in the .well-known directory, which appears to be looking for webshells.
https://isc.sans.edu/diary/Webshells%20Hiding%20in%20.well-known%20Places/32320
Cisco Patches Critical Exploited Vulnerabilities
Cisco released updates addressing already-exploited vulnerabilities in the VPN web server for the ASA and FTD appliances.
https://sec.cloudapps.cisco.com/security/center/resources/asa_ftd_continued_attacks
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-z5xP8EUB
https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-asaftd-webvpn-YROOTUW
XCSSET Evolves Again
Microsoft detected a new XCSSET variant, an infostealer infecting X-Code projects.
https://www.microsoft.com/en-us/security/blog/2025/09/25/xcsset-evolves-again-analyzing-the-latest-updates-to-xcssets-inventory/
Exploitation of Fortra GoAnywhere MFT CVE-2025-10035
watchTowr analyzed the latest GoAnywhere MFT vulnerability and exploits used against it.
https://labs.watchtowr.com/it-is-bad-exploitation-of-fortra-goanywhere-mft-cve-2025-10035-part-2/
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