sigmahighHunting

Suspicious Explorer Process with Whitespace Padding - ClickFix/FileFix

Detects process creation with suspicious whitespace padding followed by a '#' character, which may indicate ClickFix or FileFix techniques used to conceal malicious commands from visual inspection. ClickFix and FileFix are social engineering attack techniques where adversaries distribute phishing documents or malicious links that deceive users into opening the Windows Run dialog box or File Explorer search bar. The victims are then instructed to paste commands from their clipboard, which contain extensive whitespace padding using various Unicode space characters to push the actual malicious command far to the right, effectively hiding it from immediate view.

MITRE ATT&CK

T1204.004 T1027.010

executiondefense-evasion

Detection Query

selection_explorer:
  ParentImage|endswith: \explorer.exe
  CommandLine|contains: "#"
selection_space_variation:
  CommandLine|contains:
    -             
    -             
    -             
    -             
    -             
    -             
    -             
    -             
    -             
    -             
    -             
    -             
    - "            "
condition: all of selection_*

Author

Swachchhanda Shrawan Poudel (Nextron Systems)

Created

2025-11-04

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.executionattack.t1204.004attack.defense-evasionattack.t1027.010

Raw Content

title: Suspicious Explorer Process with Whitespace Padding - ClickFix/FileFix
id: 3ae9974a-eb09-4044-8e70-8980a50c12c8
related:
    - id: 8f2a5c3d-9e4b-4a7c-8d1f-2e5a6b9c3d7e
      type: similar
    - id: 7a1b4c5e-8f3d-4b9a-7c2e-1f4a5b8c6d9e
      type: similar
status: experimental
description: |
    Detects process creation with suspicious whitespace padding followed by a '#' character, which may indicate ClickFix or FileFix techniques used to conceal malicious commands from visual inspection.
    ClickFix and FileFix are social engineering attack techniques where adversaries distribute phishing documents or malicious links that deceive users into opening the Windows Run dialog box or File Explorer search bar.
    The victims are then instructed to paste commands from their clipboard, which contain extensive whitespace padding using various Unicode space characters to push the actual malicious command far to the right, effectively hiding it from immediate view.
references:
    - https://expel.com/blog/cache-smuggling-when-a-picture-isnt-a-thousand-words/
    - https://mrd0x.com/filefix-clickfix-alternative/
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-11-04
modified: 2025-11-26
tags:
    - attack.execution
    - attack.t1204.004
    - attack.defense-evasion
    - attack.t1027.010
logsource:
    category: process_creation
    product: windows
detection:
    selection_explorer:
        ParentImage|endswith: '\explorer.exe'
        CommandLine|contains: '#'
    selection_space_variation:
        CommandLine|contains:
            - '            ' # En Quad (U+2000)
            - '            ' # Em Quad (U+2001)
            - '            ' # En Space (U+2002)
            - '            ' # Em Space (U+2003)
            - '            ' # Three-Per-Em Space (U+2004)
            - '            ' # Four-Per-Em Space (U+2005)
            - '            ' # Six-Per-Em Space (U+2006)
            - '            ' # Figure Space (U+2007)
            - '            ' # Punctuation Space (U+2008)
            - '            ' # Thin Space (U+2009)
            - '            ' # Hair Space (U+200A)
            - '            ' # No-Break Space (U+00A0)
            - '            ' # Normal space (0x20)
    condition: all of selection_*
falsepositives:
    - Unknown
level: high