Unsigned Binary Loaded From Suspicious Location — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: high. Source dates: 2022-08-03 / 2022-09-28.

{
  "product": "windows",
  "service": "security-mitigations"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 359c04b0b09e0abab06bfd0520e89186af7d490f1eb156834d135e0ee2c35dab

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Unsigned Binary Loaded From Suspicious Location
id: 8289bf8c-4aca-4f5a-9db3-dc3d7afe5c10
status: test
description: Detects Code Integrity (CI) engine blocking processes from loading unsigned DLLs residing in suspicious locations
references:
    - https://github.com/nasbench/EVTX-ETW-Resources/blob/45fd5be71a51aa518b1b36d4e1f36af498084e27/ETWEventsList/CSV/Windows11/21H2/W11_21H2_Pro_20220719_22000.795/Providers/Microsoft-Windows-Security-Mitigations.csv
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-08-03
modified: 2022-09-28
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.execution
    - attack.stealth
    - attack.t1574.001
logsource:
    product: windows
    service: security-mitigations
detection:
    selection:
        EventID:
            - 11
            - 12
        ImageName|contains:
            - '\Users\Public\'
            - '\PerfLogs\'
            - '\Desktop\'
            - '\Downloads\'
            - '\AppData\Local\Temp\'
            - 'C:\Windows\TEMP\'
    condition: selection
falsepositives:
    - Unknown
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://github.com/nasbench/EVTX-ETW-Resources/blob/45fd5be71a51aa518b1b36d4e1f36af498084e27/ETWEventsList/CSV/Windows11/21H2/W11_21H2_Pro_20220719_22000.795/Providers/Microsoft-Windows-Security-Mitigations.csv