Suspicious Unsigned Thor Scanner Execution

SIGMA detection rule by Nasreddine Bencherchali (Nextron Systems) · NOASSERTION

Detects loading and execution of an unsigned thor scanner binary.

title: Suspicious Unsigned Thor Scanner Execution
id: ea5c131b-380d-49f9-aeb3-920694da4d4b
status: stable
description: Detects loading and execution of an unsigned thor scanner binary.
references:
    - Internal Research
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-10-29
tags:
    - attack.privilege-escalation
    - attack.persistence
    - attack.execution
    - attack.stealth
    - attack.t1574.001
logsource:
    category: image_load
    product: windows
detection:
    selection:
        Image|endswith:
            - '\thor.exe'
            - '\thor64.exe'
        ImageLoaded|endswith:
            - '\thor.exe'
            - '\thor64.exe'
    filter_main:
        Signed: 'true'
        SignatureStatus: 'valid'
        Signature: 'Nextron Systems GmbH'
    condition: selection and not filter_main
falsepositives:
    - Other legitimate binaries named "thor.exe" that aren't published by Nextron Systems
level: high

[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

10d6484d-29cc-4a0d-bc85-fb060fb18893

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Executable code, not a declarative rule

This submission is arbitrary [[ currentRule.format ? currentRule.format.toUpperCase() : '' ]] code, not a declarative detection rule — review it as you would any script before running it, and note that it cannot be safely aggregated or auto-executed alongside YARA/Sigma/Suricata/CRS rules.

Rejected pattern present

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Format & documentation suggestions

Not a security issue — this rule is valid and was accepted as-is. These are optional fields/conventions its own format recommends, mainly affecting its quality score and how well it documents itself for other reviewers.

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[[ currentRule.title && currentRule.title.length > 60 ? currentRule.title.slice(0, 60) + '…' : currentRule.title ]]

[[ currentRule.title ]]

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