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Detection rules › Sigma

Potential Chrome Frame Helper DLL Sideloading

Status
test
Severity
medium
Log source
category image_load, product windows
Author
Nasreddine Bencherchali (Nextron Systems), Wietze Beukema (project and research)
Source
github.com/SigmaHQ/sigma

Detects potential DLL sideloading of "chrome_frame_helper.dll"

MITRE ATT&CK coverage

TacticTechniques
Execution
Stealth

Telemetry coverage

ProviderRecord / event type
SysmonEvent ID 7: Image loaded

Rule body

title: Potential Chrome Frame Helper DLL Sideloading
id: 72ca7c75-bf85-45cd-aca7-255d360e423c
status: test
description: Detects potential DLL sideloading of "chrome_frame_helper.dll"
references:
    - https://hijacklibs.net/entries/3rd_party/google/chrome_frame_helper.html
author: Nasreddine Bencherchali (Nextron Systems), Wietze Beukema (project and research)
date: 2022-08-17
modified: 2023-05-15
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.execution
    - attack.stealth
    - attack.t1574.001
logsource:
    category: image_load
    product: windows
detection:
    selection:
        ImageLoaded|endswith: '\chrome_frame_helper.dll'
    filter_main_path:
        ImageLoaded|startswith:
            - 'C:\Program Files\Google\Chrome\Application\'
            - 'C:\Program Files (x86)\Google\Chrome\Application\'
    filter_optional_user_path:
        ImageLoaded|contains: '\AppData\local\Google\Chrome\Application\'
    condition: selection and not 1 of filter_main_* and not 1 of filter_optional_*
falsepositives:
    - Unknown
level: medium

Stages and Predicates

Stage 0: condition

selection and not 1 of filter_main_* and not 1 of filter_optional_*

Stage 1: selection

selection:
    ImageLoaded|endswith: '\chrome_frame_helper.dll'

Stage 2: not filter_main_path

filter_main_path:
    ImageLoaded|startswith:
        - 'C:\Program Files\Google\Chrome\Application\'
        - 'C:\Program Files (x86)\Google\Chrome\Application\'

Stage 3: not filter_optional_user_path

filter_optional_user_path:
    ImageLoaded|contains: '\AppData\local\Google\Chrome\Application\'

Exclusions

The rule actively suppresses these predicates.

FieldKindExcluded valuesSearch
ImageLoadedstarts_withC:\Program Files (x86)\Google\Chrome\Application\excludes:ImageLoaded field:"ImageLoaded" value:"C:\Program Files (x86)\Google\Chrome\Application\"
ImageLoadedstarts_withC:\Program Files\Google\Chrome\Application\excludes:ImageLoaded field:"ImageLoaded" value:"C:\Program Files\Google\Chrome\Application\"
ImageLoadedmatch\AppData\local\Google\Chrome\Application\excludes:ImageLoaded field:"ImageLoaded" value:"\AppData\local\Google\Chrome\Application\"

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
ImageLoadedends_with
  • \chrome_frame_helper.dll
field:"ImageLoaded" kind:ends_with value:"\chrome_frame_helper.dll"