detection.wiki

Detection rules › Sigma

Suspicious Files in Default GPO Folder

Status
test
Severity
medium
Log source
product windows, category file_event
Author
elhoim
Source
github.com/SigmaHQ/sigma

Detects the creation of copy of suspicious files (EXE/DLL) to the default GPO storage folder

MITRE ATT&CK coverage

TacticTechniques
StealthT1036.005 Masquerading: Match Legitimate Resource Name or Location

Event coverage

ProviderEventTitle
SysmonEvent ID 11FileCreate

Rule body yaml

title: Suspicious Files in Default GPO Folder
id: 5f87308a-0a5b-4623-ae15-d8fa1809bc60
status: test
description: Detects the creation of copy of suspicious files (EXE/DLL) to the default GPO storage folder
references:
    - https://redcanary.com/blog/intelligence-insights-november-2021/
author: elhoim
date: 2022-04-28
tags:
    - attack.stealth
    - attack.t1036.005
logsource:
    product: windows
    category: file_event
detection:
    selection:
        TargetFilename|contains: '\Policies\{31B2F340-016D-11D2-945F-00C04FB984F9}\'
        TargetFilename|endswith:
            - '.dll'
            - '.exe'
    condition: selection
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    TargetFilename|contains: '\Policies\{31B2F340-016D-11D2-945F-00C04FB984F9}\'
    TargetFilename|endswith:
        - '.dll'
        - '.exe'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
TargetFilenameends_with
  • .dll corpus 23 (sigma 23)
  • .exe corpus 21 (sigma 20, splunk 1)
TargetFilenamematch
  • \Policies\{31B2F340-016D-11D2-945F-00C04FB984F9}\