Sigma rule: Suspicious Desktopimgdownldr Command

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-904a5dda9c07, updated 2021-11-27T00:00:00.000Z.

Rule

Title
Suspicious Desktopimgdownldr Command
Status
test
Level
high
Author
Florian Roth (Nextron Systems)
Date
2020-07-03
Modified
2021-11-27
File
rules/windows/process_creation/proc_creation_win_desktopimgdownldr_susp_execution.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects a suspicious Microsoft desktopimgdownldr execution with parameters used to download files from the Internet

Log source

product
windows
category
process_creation

Detection

selection1:
    CommandLine|contains: ' /lockscreenurl:'
selection1_filter:
    CommandLine|contains:
        - '.jpg'
        - '.jpeg'
        - '.png'
selection_reg:
    CommandLine|contains|all:
        - 'reg delete'
        - '\PersonalizationCSP'
condition: ( selection1 and not selection1_filter ) or selection_reg

False positives (as the rule lists them)

  • False positives depend on scripts and administrative tools used in the monitored environment

Tags

  • attack.command-and-control
  • attack.t1105

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_desktopimgdownldr_susp_execution.yml

Sources and licences

  • SigmaHQ

    "Suspicious Desktopimgdownldr Command" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/process_creation/proc_creation_win_desktopimgdownldr_susp_execution.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Suspicious Desktopimgdownldr Command",
entity page, dataset version ref-904a5dda9c07, updated 2021-11-27T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/bb58aa4a-b80b-415a-a2c0-2f65a4c81009 (accessed 2026-11-03).
Underlying source: SigmaHQ rule bb58aa4a-b80b-415a-a2c0-2f65a4c81009, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.