SID 1:51642

Rule Category

MALWARE-CNC -- Snort has detected a Comand and Control (CNC) rule violation, most likely for commands and calls for files or other stages from the control server. The alert indicates a host has been infiltrated by an attacker, who is using the host to make calls for files, as a call-home vector for other malware-infected networks, for shuttling traffic back to bot owners, etc.

Alert Message

MALWARE-CNC Osx.Trojan.Gmera variant outbound connection

Rule Explanation

This event is generated when a MacOS machine infected with a Gmera variant attempts to send the username and IP address of the system to a remote server. Impact: A Network Trojan was detected Details: This Gmera variant collects the username and IP address from the infected machine via whoami and ‘curl -s ipecho.net/plain’. It then connects to the malware URL and sends the data using the following format: hxxp://malware.com/link.php?username&ip_address Ease of Attack:

What To Look For

No information provided

Known Usage

No public information

False Positives

No known false positives

Contributors

Cisco Talos Intelligence Group