Searches for rare processes running on multiple hosts in an entire fleet or network. This reduces the detection of false positives since automated maintenance processes usually only run occasionally on a single machine but are common to all or many hosts in a fleet.
Rule type: machine_learning
Rule indices: None
Risk score: 21
Runs every: 15m
Maximum alerts per execution: 100
- Threat Detection
Rule license: Elastic License v2
## Triage and analysis ### Investigating an Unusual Windows Process Detection alerts from this rule indicate the presence of a Windows process that is rare and unusual for all of the Windows hosts for which Winlogbeat data is available. Here are some possible avenues of investigation: - Consider the user as identified by the username field. Is this program part of an expected workflow for the user who ran this program on this host? - Examine the history of execution. If this process only manifested recently, it might be part of a new software package. If it has a consistent cadence (for example if it runs monthly or quarterly), it might be part of a monthly or quarterly business process. - Examine the process metadata like the values of the Company, Description and Product fields which may indicate whether the program is associated with an expected software vendor or package. - Examine arguments and working directory. These may provide indications as to the source of the program or the nature of the tasks it is performing. - Consider the same for the parent process. If the parent process is a legitimate system utility or service, this could be related to software updates or system management. If the parent process is something user-facing like an Office application, this process could be more suspicious. - If you have file hash values in the event data, and you suspect malware, you can optionally run a search for the file hash to see if the file is identified as malware by anti-malware tools.
Framework: MITRE ATT&CKTM