title: HTML Help Shell Spawn
ruletype: Sigma
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'
    - '*\powershell.exe'
    - '*\wscript.exe'
    - '*\cscript.exe'
    - '*\regsvr32.exe'
    - '*\wmic.exe'
    - '*\rundll32.exe'
  condition: (SELECTION_1 and SELECTION_2 and SELECTION_3)
falsepositives:
- unknown
fields:
- CommandLine
- ParentCommandLine
id: 52cad028-0ff0-4854-8f67-d25dfcbc78b4
level: high
logsource:
  category: process_creation
  product: windows
modified: 2021/11/27
references:
- https://www.trustwave.com/en-us/resources/blogs/spiderlabs-blog/chm-badness-delivers-a-banking-trojan/
status: test
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