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Detection rules › Sigma

Katz Stealer DLL Loaded

Status
experimental
Severity
high
Log source
product windows, category image_load
Author
Swachchhanda Shrawan Poudel (Nextron Systems)
Source
github.com/SigmaHQ/sigma

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.

MITRE ATT&CK coverage

TacticTechniques
ExecutionT1129 Shared Modules

Event coverage

ProviderEventTitle
SysmonEvent ID 7Image loaded

Rule body yaml

title: Katz Stealer DLL Loaded
id: e6c7ab7c-c79d-4b84-b913-b2ec3f8e8a98
status: experimental
description: |
    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.
references:
    - Internal Research
author: Swachchhanda Shrawan Poudel (Nextron Systems)
date: 2025-05-22
tags:
    - attack.execution
    - attack.t1129
    - detection.emerging-threats
logsource:
    category: image_load
    product: windows
detection:
    selection:
        ImageLoaded|endswith:
            - '\katz_ontop.dll'
            - '\AppData\Local\Temp\received_dll.dll'
    condition: selection
falsepositives:
    - Unlikely
level: high

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

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

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

FieldKindValues
ImageLoadedends_with
  • \AppData\Local\Temp\received_dll.dll
  • \katz_ontop.dll