sigmahighHunting

Remote CHM File Download/Execution Via HH.EXE

Detects the usage of "hh.exe" to execute/download remotely hosted ".chm" files.

MITRE ATT&CK

defense-evasion

Detection Query

selection_img:
  - OriginalFileName: HH.exe
  - Image|endswith: \hh.exe
selection_cli:
  CommandLine|contains:
    - http://
    - https://
    - \\\\
condition: all of selection_*

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2022-09-29

Data Sources

windowsProcess Creation Events

Platforms

windows

References

Tags

attack.defense-evasionattack.t1218.001

Raw Content

title: Remote CHM File Download/Execution Via HH.EXE
id: f57c58b3-ee69-4ef5-9041-455bf39aaa89
status: test
description: Detects the usage of "hh.exe" to execute/download 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
    - https://www.zscaler.com/blogs/security-research/unintentional-leak-glimpse-attack-vectors-apt37
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-09-29
modified: 2024-01-31
tags:
    - attack.defense-evasion
    - attack.t1218.001
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - OriginalFileName: 'HH.exe'
        - Image|endswith: '\hh.exe'
    selection_cli:
        CommandLine|contains:
            - 'http://'
            - 'https://'
            - '\\\\'
    condition: all of selection_*
falsepositives:
    - Unknown
level: high