sigma-rules/rules/linux/persistence_shell_activity_by_web_server.toml

[metadata]
creation_date = "2020/02/18"
maturity = "production"
updated_date = "2021/03/03"

[rule]
author = ["Elastic"]
description = "Identifies suspicious commands executed via a web server, which may suggest a vulnerability and remote shell access."
false_positives = [
    """
    Network monitoring or management products may have a web server component that runs shell commands as part of normal
    behavior.
    """,
]
from = "now-9m"
index = ["auditbeat-*", "logs-endpoint.events.*"]
language = "kuery"
license = "Elastic License v2"
name = "Potential Shell via Web Server"
references = ["https://pentestlab.blog/tag/web-shell/"]
risk_score = 47
rule_id = "231876e7-4d1f-4d63-a47c-47dd1acdc1cb"
severity = "medium"
tags = ["Elastic", "Host", "Linux", "Threat Detection", "Persistence"]
timestamp_override = "event.ingested"
type = "query"

query = '''
event.category:process and event.type:(start or process_started) and process.name:(bash or dash) and
  user.name:(apache or nginx or www or "www-data")
'''


[[rule.threat]]
framework = "MITRE ATT&CK"
[[rule.threat.technique]]
id = "T1505"
name = "Server Software Component"
reference = "https://attack.mitre.org/techniques/T1505/"
[[rule.threat.technique.subtechnique]]
id = "T1505.003"
name = "Web Shell"
reference = "https://attack.mitre.org/techniques/T1505/003/"



[rule.threat.tactic]
id = "TA0003"
name = "Persistence"
reference = "https://attack.mitre.org/tactics/TA0003/"