FileFix - Suspicious Child Process from Browser File Upload Abuse

 1title: FileFix - Suspicious Child Process from Browser File Upload Abuse
 2id: 4be03877-d5b6-4520-85c9-a5911c0a656c
 3status: experimental
 4description: |
 5    Detects potentially suspicious subprocesses such as LOLBINs spawned by web browsers. This activity could be associated with the "FileFix" social engineering technique,
 6    where users are tricked into launching the file explorer via a browser-based phishing page and pasting malicious commands into the address bar.
 7    The technique abuses clipboard manipulation and disguises command execution as benign file path access, resulting in covert execution of system utilities.    
 8references:
 9    - https://mrd0x.com/filefix-clickfix-alternative/
10author: 0xFustang
11date: 2025-06-26
12modified: 2025-06-30
13tags:
14    - attack.execution
15    - attack.t1204.004
16logsource:
17    category: process_creation
18    product: windows
19detection:
20    selection:
21        ParentImage|endswith:
22            - '\brave.exe'
23            - '\chrome.exe'
24            - '\firefox.exe'
25            - '\msedge.exe'
26        Image|endswith:
27            - '\bitsadmin.exe'
28            - '\certutil.exe'
29            - '\cmd.exe'
30            - '\mshta.exe'
31            - '\powershell.exe'
32            - '\pwsh.exe'
33            - '\regsvr32.exe'
34        CommandLine|contains: '#'
35    condition: selection
36falsepositives:
37    - Legitimate use of PowerShell or other utilities launched from browser extensions or automation tools
38level: high