LoFP / false postitve might occur with legitimate or uncommon extensions used internally. initial baseline is required.

Techniques

• t1218

Sample rules

Diskshadow Script Mode - Uncommon Script Extension Execution

• source: sigma
• technicques:
  • t1218

Description

Detects execution of “Diskshadow.exe” in script mode to execute an script with a potentially uncommon extension. Initial baselining of the allowed extension list is required.

Detection logic

condition: all of selection_* and not 1 of filter_main_*
filter_main_ext:
  CommandLine|contains: .txt
selection_flag:
  CommandLine|contains|windash: '-s '
selection_img:
- OriginalFileName: diskshadow.exe
- Image|endswith: \diskshadow.exe