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 SMB Trans secondary out of bounds write attempt

Rule Explanation

This event is generated when an attempt to exploit an SMB connection using exploits seen in the APT3 Bemstour campaign. Impact: Potential Remote Code Execution Details: This alert is triggered when SMB traffic that closely resembles an exploit observed in the APT3 Bemstour campaign. This rule is a generic rule used to detect suspicious activity in the SMB transactions that could indicate an exploit. Ease of Attack: Simple

What To Look For

This rule fires when an attempt to exploit a Windows SMB vulnerability is detected on the network.

Known Usage

No public information

False Positives

No known false positives


Cisco Talos Intelligence Group

MITRE ATT&CK Framework

Tactic: Initial Access

Technique: Exploit Public-Facing Application

For reference, see the MITRE ATT&CK vulnerability types here:

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