[metadata]
creation_date = "2020/07/06"
maturity = "production"
updated_date = "2020/12/09"

[rule]
author = ["Elastic"]
description = """
This rule detects a known command and control pattern in network events. The FIN7 threat group is known to use this
command and control technique, while maintaining persistence in their target's network.
"""
false_positives = [
    """
    This rule could identify benign domains that are formatted similarly to FIN7's command and control algorithm. Alerts
    should be investigated by an analyst to assess the validity of the individual observations.
    """,
]
index = ["packetbeat-*"]
language = "lucene"
license = "Elastic License"
name = "Possible FIN7 DGA Command and Control Behavior"
note = "In the event this rule identifies benign domains in your environment, the `destination.domain` field in the rule can be modified to include those domains. Example: `...AND NOT destination.domain:(zoom.us OR benign.domain1 OR benign.domain2)`."
references = [
    "https://www.fireeye.com/blog/threat-research/2018/08/fin7-pursuing-an-enigmatic-and-evasive-global-criminal-operation.html",
]
risk_score = 73
rule_id = "4a4e23cf-78a2-449c-bac3-701924c269d3"
severity = "high"
tags = ["Elastic", "Network", "Threat Detection", "Command and Control"]
type = "query"

query = '''
event.category:(network OR network_traffic) AND type:(tls OR http) AND network.transport:tcp
AND destination.domain:/[a-zA-Z]{4,5}\.(pw|us|club|info|site|top)/ AND NOT destination.domain:zoom.us
'''


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

[[rule.threat.technique]]
id = "T1568"
name = "Dynamic Resolution"
reference = "https://attack.mitre.org/techniques/T1568/"
[[rule.threat.technique.subtechnique]]
id = "T1568.002"
name = "Domain Generation Algorithms"
reference = "https://attack.mitre.org/techniques/T1568/002/"


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

