LoFP / legitimate software installations or updates that modify the shell open command registry keys to these locations.

Techniques

• t1546
• t1546.001
• t1548
• t1548.002

Sample rules

Suspicious Shell Open Command Registry Modification

• source: sigma
• technicques:
  • t1546
  • t1546.001
  • t1548
  • t1548.002

Description

Detects modifications to shell open registry keys that point to suspicious locations typically used by malware for persistence. Generally, modifications to the *\shell\open\command registry key can indicate an attempt to change the default action for opening files, and various UAC bypass or persistence techniques involve modifying these keys to execute malicious scripts or binaries.

Detection logic

condition: selection
selection:
  Details|contains:
  - \$Recycle.Bin\
  - \AppData\Local\Temp\
  - \Contacts\
  - \Music\
  - \PerfLogs\
  - \Photos\
  - \Pictures\
  - \Users\Public\
  - \Videos\
  - \Windows\Temp\
  - '%AppData%'
  - '%LocalAppData%'
  - '%Temp%'
  - '%tmp%'
  TargetObject|contains: \shell\open\command\