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.
INDICATOR-COMPROMISE UPnP SUBSCRIBE Callback denial-of-service attempt
The UPNP implementation on many devices are vulnerable to a type of SSRF that would allow an attacker the ability to obtain data they otherwise would not have access to.
What To Look For
This rule will alert when an attempt is made to perform an external UPNP Subscriber Callback request is made against an internal system.
Public information/Proof of Concept available
No known false positives
Cisco Talos Intelligence Group
MITRE ATT&CK Framework
Technique: Account Access Removal
For reference, see the MITRE ATT&CK vulnerability types here:
Denial of Service
Denial of Service attacks aim to make a server or program unresponsive for users. These attacks may be volume-based, to overwhelm the system, or they may use certain logical flaws in the software to cut the service off from the users. The attack may come from one or multiple sources. These attacks do not usually lead to a remote code execution. Volume based attacks are best handled using a firewall application.
CVE Additional Information