SID 1:8081

Rule Category

INDICATOR-SCAN -- Snort detected a system behavior that suggests the system has been affected by malware. That behavior is known as an Indicator of Compromise (IOC). The symptoms could be a wide range of behaviors, from a suspicious file name to an unusual use of a utility. Symptoms do not guarantee an infection; your network configuration may not be affected by malware, but showing indicators as a result of a normal function. This alert showed because Snort has detected a tool or script attempting to find objects on the network. This could be as simple as pinging a specific port that WordPress admins commonly use to see if a WordPress-targeted attack might succeed, or it could be as complex as attempting to create a map of the entire network, including ports, services, and devices. Snort scans the signature of this attempt to determine if it is different from the allowed network scanning tools (such as NMAP), and is therefore likely an attack.

Alert Message

INDICATOR-SCAN UPnP service discover attempt

Rule Explanation

This event is generated when a scan is detected. Impact: Information gathering. Details: This event indicates that an attempt has been made to scan a host. This may be the prelude to an attack. Scanners are used to ascertain which ports a host may be listening on, whether or not the ports are filtered by a firewall and if the host is vulnerable to a particular exploit. Ease of Attack: Simple.

What To Look For

No information provided

Known Usage

No public information

False Positives

Known false positives, with the described conditions

A scanner may be used in a security audit.

Contributors

Cisco Talos Brian Caswell Nigel Houghton