Suspicious Regsvr32 Execution From Remote Share — Sigma Rule

Rule metadata and linked tags

Author: Nasreddine Bencherchali (Nextron Systems). Source status: test; severity: high. Source dates: 2022-10-31 / not supplied.

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 545a62df8c65c9fca2650fac4aab9737d1e538fa3b5c92863e3dd9a559234177

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: Suspicious Regsvr32 Execution From Remote Share
id: 88a87a10-384b-4ad7-8871-2f9bf9259ce5
status: test
description: Detects REGSVR32.exe to execute DLL hosted on remote shares
references:
    - https://thedfirreport.com/2022/10/31/follina-exploit-leads-to-domain-compromise/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-10-31
tags:
    - attack.stealth
    - attack.t1218.010
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\regsvr32.exe'
        - OriginalFileName: '\REGSVR32.EXE'
    selection_cli:
        CommandLine|contains: ' \\\\'
    condition: all of selection_*
falsepositives:
    - Unknown
# Decrease to medium if this is something common in your org
level: high

Original YAML and metadata in JSON

False positives

• Unknown

Source references

• https://thedfirreport.com/2022/10/31/follina-exploit-leads-to-domain-compromise/