Sigma rule: Katz Stealer DLL Loaded

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-766d3180ec92, updated 2025-05-22T00:00:00.000Z.

Rule

Title
Katz Stealer DLL Loaded
Status
experimental
Level
high
Author
Swachchhanda Shrawan Poudel (Nextron Systems)
Date
2025-05-22
File
rules-emerging-threats/2025/Malware/Katz-Stealer/image_load_win_katz_stealer_payloads.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects loading of DLLs associated with Katz Stealer malware 2025 variants.
Katz Stealer is a malware variant that is known to be used for stealing sensitive information from compromised systems.
The process that loads these DLLs are very likely to be malicious.

Log source

product
windows
category
image_load

Detection

selection:
    ImageLoaded|endswith:
        - '\katz_ontop.dll'
        - '\AppData\Local\Temp\received_dll.dll'
condition: selection

False positives (as the rule lists them)

  • Unlikely

Tags

  • attack.execution
  • attack.t1129
  • detection.emerging-threats

MITRE ATT&CK ids this rule names

References

  • Internal Research

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2025/Malware/Katz-Stealer/image_load_win_katz_stealer_payloads.yml

Sources and licences

  • SigmaHQ

    "Katz Stealer DLL Loaded" by Swachchhanda Shrawan Poudel (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules-emerging-threats/2025/Malware/Katz-Stealer/image_load_win_katz_stealer_payloads.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: Katz Stealer DLL Loaded",
entity page, dataset version ref-766d3180ec92, updated 2025-05-22T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/e6c7ab7c-c79d-4b84-b913-b2ec3f8e8a98 (accessed 2026-11-03).
Underlying source: SigmaHQ rule e6c7ab7c-c79d-4b84-b913-b2ec3f8e8a98, 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.