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Detection rules › Sigma

Potential Persistence Via CHM Helper DLL

Status
test
Severity
high
Log source
product windows, category registry_set
Author
Nasreddine Bencherchali (Nextron Systems)
Source
github.com/SigmaHQ/sigma

Detects when an attacker modifies the registry key "HtmlHelp Author" to achieve persistence

MITRE ATT&CK coverage

TacticTechniques
PersistenceNo specific technique

Event coverage

ProviderEventTitle
SysmonEvent ID 13RegistryEvent (Value Set)

Rule body yaml

title: Potential Persistence Via CHM Helper DLL
id: 976dd1f2-a484-45ec-aa1d-0e87e882262b
status: test
description: Detects when an attacker modifies the registry key "HtmlHelp Author" to achieve persistence
references:
    - https://persistence-info.github.io/Data/htmlhelpauthor.html
    - https://www.hexacorn.com/blog/2018/04/22/beyond-good-ol-run-key-part-76/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-07-21
modified: 2023-08-17
tags:
    - attack.persistence
logsource:
    category: registry_set
    product: windows
detection:
    selection:
        TargetObject|contains:
            - '\Software\Microsoft\HtmlHelp Author\Location'
            - '\Software\WOW6432Node\Microsoft\HtmlHelp Author\Location'
    condition: selection
falsepositives:
    - Unknown
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

selection:
    TargetObject|contains:
        - '\Software\Microsoft\HtmlHelp Author\Location'
        - '\Software\WOW6432Node\Microsoft\HtmlHelp Author\Location'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
TargetObjectmatch
  • \Software\Microsoft\HtmlHelp Author\Location
  • \Software\WOW6432Node\Microsoft\HtmlHelp Author\Location