Potential RoboForm.DLL Sideloading

Hunt Hypothesis

Detects potential DLL sideloading of “roboform.dll”, a DLL used by RoboForm Password Manager

Detection Rule

Sigma (Original)

title: Potential RoboForm.DLL Sideloading
id: f64c9b2d-b0ad-481d-9d03-7fc75020892a
status: test
description: Detects potential DLL sideloading of "roboform.dll", a DLL used by RoboForm Password Manager
references:
    - https://twitter.com/StopMalvertisin/status/1648604148848549888
    - https://twitter.com/t3ft3lb/status/1656194831830401024
    - https://www.roboform.com/
author: X__Junior (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)
date: 2023-05-14
tags:
    - attack.persistence
    - attack.privilege-escalation
    - attack.execution
    - attack.stealth
    - attack.t1574.001
logsource:
    category: image_load
    product: windows
detection:
    selection:
        ImageLoaded|endswith:
            - '\roboform.dll'
            - '\roboform-x64.dll'
    filter_main_path:
        Image|startswith:
            - ' C:\Program Files (x86)\Siber Systems\AI RoboForm\'
            - ' C:\Program Files\Siber Systems\AI RoboForm\'
        Image|endswith:
            - '\robotaskbaricon.exe'
            - '\robotaskbaricon-x64.exe'
    condition: selection and not 1 of filter_main_*
falsepositives:
    - If installed on a per-user level, the path would be located in "AppData\Local". Add additional filters to reflect this mode of installation
level: medium

KQL (Microsoft 365 Defender)

DeviceImageLoadEvents
| where (FolderPath endswith "\\roboform.dll" or FolderPath endswith "\\roboform-x64.dll") and (not(((InitiatingProcessFolderPath startswith " C:\\Program Files (x86)\\Siber Systems\\AI RoboForm\\" or InitiatingProcessFolderPath startswith " C:\\Program Files\\Siber Systems\\AI RoboForm\\") and (InitiatingProcessFolderPath endswith "\\robotaskbaricon.exe" or InitiatingProcessFolderPath endswith "\\robotaskbaricon-x64.exe"))))

Required Data Sources

False Positive Guidance

• If installed on a per-user level, the path would be located in “AppData\Local”. Add additional filters to reflect this mode of installation

MITRE ATT&CK Context

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

References

• https://twitter.com/StopMalvertisin/status/1648604148848549888
• https://twitter.com/t3ft3lb/status/1656194831830401024
• https://www.roboform.com/
• SigmaHQ Rule