Jonhnathan
73b3bec457
* Adds suggestions from security-docs
* Update rules/windows/lateral_movement_powershell_remoting_target.toml
Co-authored-by: Terrance DeJesus <99630311+terrancedejesus@users.noreply.github.com>
Co-authored-by: Terrance DeJesus <99630311+terrancedejesus@users.noreply.github.com>
(cherry picked from commit 1c50f35aed)
84 lines
2.8 KiB
TOML
84 lines
2.8 KiB
TOML
[metadata]
|
|
creation_date = "2021/11/25"
|
|
maturity = "production"
|
|
updated_date = "2022/02/28"
|
|
|
|
[rule]
|
|
author = ["Elastic"]
|
|
description = """
|
|
Identifies a potential exploitation of InstallerTakeOver (CVE-2021-41379) default PoC execution. Successful exploitation
|
|
allows an unprivileged user to escalate privileges to SYSTEM.
|
|
"""
|
|
from = "now-9m"
|
|
index = ["winlogbeat-*", "logs-endpoint.events.*", "logs-windows.*"]
|
|
language = "eql"
|
|
license = "Elastic License v2"
|
|
name = "Potential Privilege Escalation via InstallerFileTakeOver"
|
|
note = """## Triage and analysis.
|
|
|
|
### Investigating Potential Priivilege Escalation via InstallerFileTakeOver
|
|
|
|
InstallerFileTakeOver is a weaponized EoP PoC to the CVE-2021-41379 vulnerability. Upon successful exploitation,
|
|
an unprivileged user will escalate privileges to SYSTEM/NT AUTHORITY.
|
|
|
|
This rule detects the default execution of the PoC, which overwrites the `elevation_service.exe` DACL and copies itself
|
|
to the location to escalate privileges. An attacker is able to still take over any file that is not in use (locked), which is outside the scope of this rule.
|
|
|
|
#### Possible investigation steps:
|
|
|
|
- Check for the digital signature of the executable.
|
|
- Look for additional processes spawned by the process, command lines, and network communications.
|
|
- Look for additional alerts involving the host and the user.
|
|
|
|
### False Positive Analysis
|
|
|
|
- Verify whether the digital signature exists in the executable, and if it is valid.
|
|
|
|
### Related Rules
|
|
|
|
- Suspicious DLL Loaded for Persistence or Privilege Escalation - bfeaf89b-a2a7-48a3-817f-e41829dc61ee
|
|
|
|
### Response and Remediation
|
|
|
|
- Immediate response steps should be taken to validate, investigate, and potentially contain the activity to prevent
|
|
further post-compromise behavior.
|
|
"""
|
|
references = [
|
|
"https://github.com/klinix5/InstallerFileTakeOver"
|
|
]
|
|
risk_score = 73
|
|
rule_id = "58c6d58b-a0d3-412d-b3b8-0981a9400607"
|
|
severity = "high"
|
|
tags = ["Elastic", "Host", "Windows", "Threat Detection", "Privilege Escalation"]
|
|
timestamp_override = "event.ingested"
|
|
type = "eql"
|
|
|
|
query = '''
|
|
/* This rule is compatible with both Sysmon and Elastic Endpoint */
|
|
|
|
process where event.type == "start" and
|
|
(process.Ext.token.integrity_level_name : "System" or
|
|
winlog.event_data.IntegrityLevel : "System") and
|
|
(
|
|
(process.name : "elevation_service.exe" and
|
|
not process.pe.original_file_name == "elevation_service.exe") or
|
|
|
|
(process.parent.name : "elevation_service.exe" and
|
|
process.name : ("rundll32.exe", "cmd.exe", "powershell.exe"))
|
|
)
|
|
'''
|
|
|
|
|
|
[[rule.threat]]
|
|
framework = "MITRE ATT&CK"
|
|
|
|
[[rule.threat.technique]]
|
|
id = "T1068"
|
|
reference = "https://attack.mitre.org/techniques/T1068/"
|
|
name = "Exploitation for Privilege Escalation"
|
|
|
|
[rule.threat.tactic]
|
|
id = "TA0004"
|
|
reference = "https://attack.mitre.org/tactics/TA0004/"
|
|
name = "Privilege Escalation"
|