Potential SolidPDFCreator.DLL Sideloading

Hunt Hypothesis

Detects potential DLL sideloading of “SolidPDFCreator.dll”

Detection Rule

Sigma (Original)

title: Potential SolidPDFCreator.DLL Sideloading
id: a2edbce1-95c8-4291-8676-0d45146862b3
status: test
description: Detects potential DLL sideloading of "SolidPDFCreator.dll"
references:
    - https://lab52.io/blog/new-mustang-pandas-campaing-against-australia/
author: X__Junior (Nextron Systems)
date: 2023-05-07
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.execution
    - attack.stealth
    - attack.t1574.001
logsource:
    category: image_load
    product: windows
detection:
    selection:
        ImageLoaded|endswith: '\SolidPDFCreator.dll'
    filter_main_path:
        Image|endswith: '\SolidPDFCreator.exe'
        ImageLoaded|startswith:
            - 'C:\Program Files (x86)\SolidDocuments\SolidPDFCreator\'
            - 'C:\Program Files\SolidDocuments\SolidPDFCreator\'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - Unknown
level: medium

KQL (Microsoft 365 Defender)

DeviceImageLoadEvents
| where FolderPath endswith "\\SolidPDFCreator.dll" and (not((InitiatingProcessFolderPath endswith "\\SolidPDFCreator.exe" and (FolderPath startswith "C:\\Program Files (x86)\\SolidDocuments\\SolidPDFCreator\\" or FolderPath startswith "C:\\Program Files\\SolidDocuments\\SolidPDFCreator\\"))))

Required Data Sources

False Positive Guidance

• Unknown

MITRE ATT&CK Context

• Tactic: Persistence
• Tactic: Privilege Escalation
• Tactic: Execution
• Technique: T1574.001 — T1574.001

References

• https://lab52.io/blog/new-mustang-pandas-campaing-against-australia/
• SigmaHQ Rule