title: Suspicious Desktopimgdownldr Target File
id: fc4f4817-0c53-4683-a4ee-b17a64bc1039
status: test
description: Detects a suspicious Microsoft desktopimgdownldr file creation that stores a file to a suspicious location or contains a file with a suspicious extension
author: Florian Roth
references:
  - https://labs.sentinelone.com/living-off-windows-land-a-new-native-file-downldr/
  - https://twitter.com/SBousseaden/status/1278977301745741825
date: 2020/07/03
modified: 2022/06/02
logsource:
  product: windows
  category: file_event
detection:
  selection:
    Image|endswith: '\svchost.exe'
    TargetFilename|contains: '\Personalization\LockScreenImage\'
  filter1:
    TargetFilename|contains: 'C:\Windows\'
  filter2:
    TargetFilename|contains:
      - '.jpg'
      - '.jpeg'
      - '.png'
  condition: selection and not filter1 and not filter2
fields:
  - CommandLine
  - ParentCommandLine
falsepositives:
  - False positives depend on scripts and administrative tools used in the monitored environment
level: high
tags:
  - attack.defense_evasion
  - attack.t1105
