Sigma rule: TA505 Dropper Load Pattern

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-d997d5801885, updated 2023-04-05T00:00:00.000Z.

SigmaHQ marks this rule as deprecated.

Rule

Title
TA505 Dropper Load Pattern
Status
deprecated
Level
critical
Author
Florian Roth (Nextron Systems)
Date
2020/12/08
Modified
2023/04/05
File
deprecated/windows/proc_creation_win_apt_ta505_dropper.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects mshta loaded by wmiprvse as parent as used by TA505 malicious documents

Log source

product
windows
category
process_creation

Detection

selection_parent:
    ParentImage|endswith: '\wmiprvse.exe'
selection_mshta:
    - Image|endswith: '\mshta.exe'
    - OriginalFileName: 'mshta.exe'
condition: all of selection_*

False positives (as the rule lists them)

  • Unknown

Tags

  • attack.execution
  • attack.g0092
  • attack.t1106

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/deprecated/windows/proc_creation_win_apt_ta505_dropper.yml

Sources and licences

  • SigmaHQ

    "TA505 Dropper Load Pattern" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/deprecated/windows/proc_creation_win_apt_ta505_dropper.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: TA505 Dropper Load Pattern",
entity page, dataset version ref-d997d5801885, updated 2023-04-05T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/18cf6cf0-39b0-4c22-9593-e244bdc9a2d4 (accessed 2026-11-03).
Underlying source: SigmaHQ rule 18cf6cf0-39b0-4c22-9593-e244bdc9a2d4, 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.