SID 1:301117

Rule Category

FILE-OFFICE -- Snort detected traffic targeting vulnerabilities in files belonging to the Microsoft Office suite of software (Excel, PowerPoint, Word, Visio, Access, Outlook, etc.).

Alert Message

FILE-OFFICE Microsoft Excel remote code execution attempt

Rule Explanation

This rule looks for files intended to exploit a remote code execution vulnerability in Microsoft Excel.

What To Look For

This rule fires on attempts to exploit a remote code execution vulnerability in Microsoft Excel.

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group

Rule Groups

Rule Categories::Operating Systems::Windows

Rule Categories::File::Office

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.

CVE

CVE-2025-21354

Additional Links

msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21354

Rule Vulnerability

Memory Corruption

Memory Corruption is any vulnerability that allows the modification of the content of memory locations in a way not intended by the developer. Memory corruption results are inconsistent; they could lead to fatal errors and system crashes or data leakage; some have no effect at all.

CVE Additional Information

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

CVE-2025-21354

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