OpenSSL Reverse Shell Activity via Named Pipe

[rule]
description = """
This rule detects the execution of a named pipe, followed by a network connection initiated by the openssl process.
Attackers may use openssl to establish a reverse connection.
"""
id = "a62907d2-673a-4d64-99c0-34b6ed0c8b32"
license = "Elastic License v2"
name = "OpenSSL Reverse Shell Activity via Named Pipe"
os_list = ["linux"]
version = "1.0.3"

query = '''
sequence by process.parent.entity_id with maxspan=10s
  [process where event.type == "start" and event.action == "exec" and process.name in ("mkfifo", "mknod")]
  [network where event.type == "start" and event.action == "connection_attempted" and process.name == "openssl"]
'''

min_endpoint_version = "8.6.0"
optional_actions = []
[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 0

[[actions]]
action = "kill_process"
field = "process.entity_id"
state = 1

[[actions]]
action = "kill_process"
field = "process.parent.entity_id"
state = 0

[[actions]]
action = "kill_process"
field = "process.parent.entity_id"
state = 1

[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1059"
name = "Command and Scripting Interpreter"
reference = "https://attack.mitre.org/techniques/T1059/"
[[threat.technique.subtechnique]]
id = "T1059.004"
name = "Unix Shell"
reference = "https://attack.mitre.org/techniques/T1059/004/"



[threat.tactic]
id = "TA0002"
name = "Execution"
reference = "https://attack.mitre.org/tactics/TA0002/"
[[threat]]
framework = "MITRE ATT&CK"
[[threat.technique]]
id = "T1071"
name = "Application Layer Protocol"
reference = "https://attack.mitre.org/techniques/T1071/"


[threat.tactic]
id = "TA0011"
name = "Command and Control"
reference = "https://attack.mitre.org/tactics/TA0011/"

[internal]
min_endpoint_version = "8.6.0"