LoFP / legitimate applications registering their binary from on of the suspicious locations mentioned above (tune it)

Techniques

• t1546
• t1546.012

Sample rules

Potential Persistence Via App Paths Default Property

• source: sigma
• technicques:
  • t1546
  • t1546.012

Description

Detects changes to the “Default” property for keys located in the \Software\Microsoft\Windows\CurrentVersion\App Paths\ registry. Which might be used as a method of persistence The entries found under App Paths are used primarily for the following purposes. First, to map an application’s executable file name to that file’s fully qualified path. Second, to prepend information to the PATH environment variable on a per-application, per-process basis.

Detection logic

condition: selection
selection:
  Details|contains:
  - \Users\Public
  - \AppData\Local\Temp\
  - \Windows\Temp\
  - \Desktop\
  - \Downloads\
  - '%temp%'
  - '%tmp%'
  - iex
  - Invoke-
  - rundll32
  - regsvr32
  - mshta
  - cscript
  - wscript
  - .bat
  - .hta
  - .dll
  - .ps1
  TargetObject|contains: \SOFTWARE\Microsoft\Windows\CurrentVersion\App Paths
  TargetObject|endswith:
  - (Default)
  - Path