Rule Document 1:66613

Rule Category

INDICATOR-COMPROMISE -- 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. In this case, attackers may be attempting to gain privileges and access other systems, spread influence, and make calls and commands with elevated access. The context of the traffic is important to determine intrusion; traffic from an administration utility performing commands on a user's computer is likely not a compromise, but a user laptop accessing a webserver may indicate intrusion.

Alert Message

INDICATOR-COMPROMISE Nx Console post-compromise malicious script download attempt

Rule Explanation

This rule looks for HTTP requests that contain a distinctive GitHub search URI used by the Nx Console post‑compromise downloader. Successful exploitation indicates the host is contacting a command‑and‑control endpoint to retrieve further malicious code.

What To Look For

This rule fires on attempts by compromised Nx Console environments to download additional malicious scripts via a specific GitHub search query.

Known Usage

Attacks/Scans seen in the wild

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group