SID 1:2043

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 isakmp login failed

Rule Explanation

This event is generated when an attempt is made to exploit a known vulnerability in the Internet Security Association and Key Management Protocol (ISAKMP). Impact: Unknown. Details: ISAKMP is a framework for authentication using cryptographic keys. It specifically defines the process of key exchange as opposed to the generation of a cryptographic key. ISAKMP also details the procedures for the required security associations in network security services. This event indicates that a key exchange using ISAKMP failed. 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 user may mistype a username or may be trying to authenticate using an expired key.

Contributors

Cisco Talos Brian Caswell Nigel Houghton