Sigma rule: File Download From Browser Process Via Inline URL

Rule

Title

File Download From Browser Process Via Inline URL

Status

test

Level

medium

Author

Florian Roth (Nextron Systems), Nasreddine Bencherchali (Nextron Systems)

Date

2022-01-11

Modified

2025-10-27

File

rules/windows/process_creation/proc_creation_win_browsers_inline_file_download.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects execution of a browser process with a URL argument pointing to a file with a potentially interesting extension. This can be abused to download arbitrary files or to hide from the user for example by launching the browser in a minimized state.

Log source

product

windows

category

process_creation

Detection

selection_img:
    Image|endswith:
        - '\brave.exe'
        - '\chrome.exe'
        - '\msedge.exe'
        - '\opera.exe'
        - '\vivaldi.exe'
selection_http:
    CommandLine|contains: 'http'
selection_extensions:
    - CommandLine|endswith:
          - '.7z'
          - '.dat'
          - '.dll'
          - '.exe'
          - '.hta'
          - '.ps1'
          - '.psm1'
          - '.txt'
          - '.vbe'
          - '.vbs'
          - '.zip'
    - CommandLine|contains:
          - '.7z"'
          - '.dat"'
          - '.dll"'
          - '.hta"'
          - '.ps1"'
          - '.psm1"'
          - '.txt"'
          - '.vbe"'
          - '.vbs"'
          - '.zip"'
condition: all of selection_*

False positives (as the rule lists them)

• Unknown

Tags

• attack.command-and-control
• attack.t1105

MITRE ATT&CK ids this rule names

• T1105

References

• https://twitter.com/mrd0x/status/1478116126005641220
• https://lolbas-project.github.io/lolbas/Binaries/Msedge/

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_browsers_inline_file_download.yml