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Detection rules › Sigma

Potential Persistence Via CHM Helper DLL

Severity
high
Author
Nasreddine Bencherchali (Nextron Systems)
Source
upstream

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

Event coverage

ProviderEvent IDTitle
Sysmon13RegistryEvent (Value Set)

Stages and Predicates

Stage 1: selection

or:
TargetObject|contains: '\Software\Microsoft\HtmlHelp Author\Location'
TargetObject|contains: '\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