Justin Ibarra
51 lines
1.7 KiB
TOML
51 lines
1.7 KiB
TOML
[metadata]
|
|
creation_date = "2022/03/15"
|
|
maturity = "production"
|
|
updated_date = "2022/03/24"
|
|
|
|
[rule]
|
|
author = ["Elastic"]
|
|
description = """
|
|
Identifies Linux binary c89/c99 abuse to break out from restricted environments by spawning an interactive system
|
|
shell.The c89/c99 utility is an interface to the standard C compilation system and the activity of spawing a shell is
|
|
not a standard use of this binary by a user or system administrator. It indicates a potentially malicious actor
|
|
attempting to improve the capabilities or stability of their access.
|
|
"""
|
|
from = "now-9m"
|
|
index = ["logs-endpoint.events.*"]
|
|
language = "eql"
|
|
license = "Elastic License v2"
|
|
name = "Linux Restricted Shell Breakout via c89/c99 Shell evasion"
|
|
references = ["https://gtfobins.github.io/gtfobins/c89/", "https://gtfobins.github.io/gtfobins/c99/"]
|
|
risk_score = 47
|
|
rule_id = "1859ce38-6a50-422b-a5e8-636e231ea0cd"
|
|
severity = "medium"
|
|
tags = ["Elastic", "Host", "Linux", "Threat Detection", "Execution", "GTFOBins"]
|
|
timestamp_override = "event.ingested"
|
|
type = "eql"
|
|
|
|
query = '''
|
|
process where event.type == "start" and process.name in ("sh", "dash", "bash") and
|
|
process.parent.name in ("c89","c99") and process.parent.args == "-wrapper" and
|
|
process.parent.args in ("sh,-s", "bash,-s", "dash,-s", "/bin/sh,-s", "/bin/bash,-s", "/bin/dash,-s")
|
|
'''
|
|
|
|
|
|
[[rule.threat]]
|
|
framework = "MITRE ATT&CK"
|
|
[[rule.threat.technique]]
|
|
id = "T1059"
|
|
name = "Command and Scripting Interpreter"
|
|
reference = "https://attack.mitre.org/techniques/T1059/"
|
|
[[rule.threat.technique.subtechnique]]
|
|
id = "T1059.004"
|
|
name = "Unix Shell"
|
|
reference = "https://attack.mitre.org/techniques/T1059/004/"
|
|
|
|
|
|
|
|
[rule.threat.tactic]
|
|
id = "TA0002"
|
|
name = "Execution"
|
|
reference = "https://attack.mitre.org/tactics/TA0002/"
|