title: HTML Help Shell Spawn
author: Maxim Pavlunin
date: 2020/04/01
description: Detects a suspicious child process of a Microsoft HTML Help system when
    executing compiled HTML files (.chm)
detection:
    SELECTION_1:
        EventID: 1
    SELECTION_2:
        ParentImage: C:\Windows\hh.exe
    SELECTION_3:
        Image: '*\cmd.exe'
    SELECTION_4:
        Image: '*\powershell.exe'
    SELECTION_5:
        Image: '*\wscript.exe'
    SELECTION_6:
        Image: '*\cscript.exe'
    SELECTION_7:
        Image: '*\regsvr32.exe'
    SELECTION_8:
        Image: '*\wmic.exe'
    SELECTION_9:
        Image: '*\rundll32.exe'
    condition: (SELECTION_1 and SELECTION_2 and (SELECTION_3 or SELECTION_4 or SELECTION_5
        or SELECTION_6 or SELECTION_7 or SELECTION_8 or SELECTION_9))
falsepositives:
- unknown
fields:
- CommandLine
- ParentCommandLine
id: 52cad028-0ff0-4854-8f67-d25dfcbc78b4
level: high
logsource:
    category: process_creation
    product: windows
modified: 2020/09/01
references:
- https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/chm-badness-delivers-a-banking-trojan/
status: experimental
tags:
- attack.defense_evasion
- attack.t1218.001
- attack.t1218.010
- attack.t1218.011
- attack.execution
- attack.t1223
- attack.t1059.001
- attack.t1059.003
- attack.t1059.005
- attack.t1059.007
- attack.t1047
yml_filename: win_html_help_spawn.yml
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation