Ross Wolf
5fcece8416
Co-Authored-By: Brent Murphy <56412096+bm11100@users.noreply.github.com> Co-Authored-By: Craig Chamberlain <randomuserid@users.noreply.github.com> Co-Authored-By: David French <56409778+threat-punter@users.noreply.github.com> Co-Authored-By: Derek Ditch <dcode@users.noreply.github.com> Co-Authored-By: Justin Ibarra <brokensound77@users.noreply.github.com>
38 lines
1.8 KiB
TOML
38 lines
1.8 KiB
TOML
[metadata]
|
|
creation_date = "2020/03/25"
|
|
ecs_version = ["1.5.0"]
|
|
maturity = "production"
|
|
updated_date = "2020/03/25"
|
|
|
|
[rule]
|
|
anomaly_threshold = 50
|
|
author = ["Elastic"]
|
|
description = """
|
|
Identifies rare processes that do not usually run on individual hosts, which can indicate execution of unauthorized
|
|
services, malware, or persistence mechanisms. Processes are considered rare when they only run occasionally as compared
|
|
with other processes running on the host.
|
|
"""
|
|
false_positives = [
|
|
"""
|
|
A newly installed program or one that runs rarely as part of a monthly or quarterly workflow could trigger this
|
|
signal.
|
|
""",
|
|
]
|
|
from = "now-45m"
|
|
interval = "15m"
|
|
license = "Elastic License"
|
|
machine_learning_job_id = "rare_process_by_host_linux_ecs"
|
|
name = "Unusual Process For a Linux Host"
|
|
note = """### Investigating an Unusual Linux Process ###
|
|
Signals from this rule indicate the presence of a Linux process that is rare and unusual for the host it ran on. 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 manifested only very 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 arguments, title and working directory. These may provide indications as to the source of the program or the nature of the tasks it is performing."""
|
|
references = ["https://www.elastic.co/guide/en/siem/guide/current/prebuilt-ml-jobs.html"]
|
|
risk_score = 21
|
|
rule_id = "46f804f5-b289-43d6-a881-9387cf594f75"
|
|
severity = "low"
|
|
tags = ["Elastic", "Linux", "ML"]
|
|
type = "machine_learning"
|
|
|