Uncommon Process Access Rights For Target Image — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems), frack113. Source status: test; severity: low. Source dates: 2024-05-27 / not supplied.

{
  "category": "process_access",
  "product": "windows"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: a2cd30b3cdbad276c2c1fcf313880826f6ea248e88fd8a691603e5ec17043065

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: Uncommon Process Access Rights For Target Image
id: a24e5861-c6ca-4fde-a93c-ba9256feddf0
status: test
description: |
    Detects process access request to uncommon target images with a "PROCESS_ALL_ACCESS" access mask.
references:
    - https://learn.microsoft.com/en-us/windows/win32/procthread/process-security-and-access-rights
author: Nasreddine Bencherchali (Nextron Systems), frack113
date: 2024-05-27
tags:
    - attack.privilege-escalation
    - attack.stealth
    - attack.t1055.011
logsource:
    category: process_access
    product: windows
detection:
    selection:
        TargetImage|endswith:
            # Note: Add additional uncommon targets to increase coverage.
            - '\calc.exe'
            - '\calculator.exe'
            - '\mspaint.exe'
            - '\notepad.exe'
            - '\ping.exe'
            - '\wordpad.exe'
            - '\write.exe'
        GrantedAccess: '0x1FFFFF' # PROCESS_ALL_ACCESS - All possible access rights for a process object.
    condition: selection
falsepositives:
    - Unknown
# Note: please upgrade to a higher level after an initial test/tuning.
level: low

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://learn.microsoft.com/en-us/windows/win32/procthread/process-security-and-access-rights