HH.EXE Initiated HTTP Network Connection

Detects a network connection initiated by the "hh.exe" process to HTTP destination ports, which could indicate the execution/download of remotely hosted .chm files.

title: HH.EXE Initiated HTTP Network Connection
id: 468a8cea-2920-4909-a593-0cbe1d96674a
related:
    - id: f57c58b3-ee69-4ef5-9041-455bf39aaa89
      type: derived
status: test
description: |
    Detects a network connection initiated by the "hh.exe" process to HTTP destination ports, which could indicate the execution/download of remotely hosted .chm files.
references:
    - https://www.splunk.com/en_us/blog/security/follina-for-protocol-handlers.html
    - https://github.com/redcanaryco/atomic-red-team/blob/1cf4dd51f83dcb0ebe6ade902d6157ad2dbc6ac8/atomics/T1218.001/T1218.001.md
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-10-05
tags:
    - attack.stealth
    - attack.t1218.001
    - detection.threat-hunting
logsource:
    category: network_connection
    product: windows
detection:
    selection:
        Image|endswith: '\hh.exe'
        Initiated: 'true'
        DestinationPort:
            - 80
            - 443
    condition: selection
falsepositives:
    - False positive is expected from launching "hh.exe" for the first time on a machine in a while or simply from help files containing reference to external sources. Best correlate this with process creation and file events.
level: medium

• T1218.001Compiled HTML File

• https://www.splunk.com/en_us/blog/security/follina-for-protocol-handlers.html↗
• https://github.com/redcanaryco/atomic-red-team/blob/1cf4dd51f83dcb0ebe6ade902d6157ad2dbc6ac8/atomics/T1218.001/T1218.001.md↗