SID 1:301123

Rule Category

OS-WINDOWS -- Snort has detected traffic targeting vulnerabilities in a Windows-based operating system. This does not include browser traffic or other software on the OS, but attacks against the OS itself. (such as?)

Alert Message

OS-WINDOWS Microsoft Windows MapUrlToZone security feature bypass attempt

Rule Explanation

This rule looks for a reference to an external resource known to bypass the MapUrlToZone security feature.

What To Look For

This rule fires on attempts to download a file containing a reference known to bypass the MapUrlToZone security feature.

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

Rule Groups

Rule Categories::Operating Systems::Windows

MITRE::ATT&CK Framework::Enterprise::Execution::User Execution::Malicious File

An adversary may rely upon a user opening a malicious file in order to gain execution. Users may be subjected to social engineering to get them to open a file that will lead to code execution. This user action will typically be observed as follow-on behavior from Spearphishing Attachment. Adversaries may use several types of files that require a user to execute them, including .doc, .pdf, .xls, .rtf, .scr, .exe, .lnk, .pif, and .cpl.

MITRE::ATT&CK Framework::Enterprise::Initial Access::Phishing

Adversaries may send phishing messages to gain access to victim systems. All forms of phishing are electronically delivered social engineering. Phishing can be targeted, known as spearphishing. In spearphishing, a specific individual, company, or industry will be targeted by the adversary. More generally, adversaries can conduct non-targeted phishing, such as in mass malware spam campaigns.

CVE

CVE-2025-21219

Additional Links

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21219

Rule Vulnerability

Escalation of Privilege

An Escalation of Privilege (EOP) attack is any attack method that results in a user or application gaining permissions to access resources they normally would not have access to.

CVE Additional Information

This product uses data from the NVD API but is not endorsed or certified by the NVD.

CVE-2025-21219

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