LoFP LoFP / benign scheduled tasks creations or executions that happen often during software installations

Techniques

Sample rules

Schedule Task Creation From Env Variable Or Potentially Suspicious Path Via Schtasks.EXE

Description

Detects Schtask creations that point to a suspicious folder or an environment variable often used by malware

Detection logic

condition: ( all of selection_1_* or all of selection_2_* ) and not 1 of filter_optional_*
filter_optional_avira_install:
  CommandLine|contains|all:
  - /Create /Xml "C:\Users\
  - \AppData\Local\Temp\.CR.
  - Avira_Security_Installation.xml
filter_optional_avira_other:
  CommandLine|contains:
  - .tmp\UpdateFallbackTask.xml
  - .tmp\WatchdogServiceControlManagerTimeout.xml
  - .tmp\SystrayAutostart.xml
  - .tmp\MaintenanceTask.xml
  CommandLine|contains|all:
  - /Create /F /TN
  - '/Xml '
  - \AppData\Local\Temp\is-
  - Avira_
filter_optional_klite_codec:
  CommandLine|contains|all:
  - \AppData\Local\Temp\
  - '/Create /TN "klcp_update" /XML '
  - \klcp_update_task.xml
filter_optional_other:
- ParentCommandLine|contains: unattended.ini
- CommandLine|contains: update_task.xml
filter_optional_team_viewer:
  CommandLine|contains: /Create /TN TVInstallRestore /TR
selection_1_all_folders:
  CommandLine|contains:
  - :\Perflogs
  - :\Users\All Users\
  - :\Users\Default\
  - :\Users\Public
  - :\Windows\Temp
  - \AppData\Local\
  - \AppData\Roaming\
  - '%AppData%'
  - '%Public%'
selection_1_create:
  CommandLine|contains: ' /create '
  Image|endswith: \schtasks.exe
selection_2_parent:
  ParentCommandLine|endswith: \svchost.exe -k netsvcs -p -s Schedule
selection_2_some_folders:
  CommandLine|contains:
  - :\Perflogs
  - :\Windows\Temp
  - \Users\Public
  - '%Public%'