Detection rules › Sigma
Suspicious Unsigned Thor Scanner Execution
Detects loading and execution of an unsigned thor scanner binary.
Known false positives
- Other legitimate binaries named "thor.exe" that aren't published by Nextron Systems
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | |
| Stealth |
Telemetry coverage
| Provider | Record / event type |
|---|---|
| Sysmon | Event ID 7: Image loaded |
Rule body
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
Stages and Predicates
Stage 0: condition
selection and not filter_mainStage 1: selection
selection:
Image|endswith:
- '\thor.exe'
- '\thor64.exe'
ImageLoaded|endswith:
- '\thor.exe'
- '\thor64.exe'
Stage 2: not filter_main
filter_main:
Signed: 'true'
SignatureStatus: 'valid'
Signature: 'Nextron Systems GmbH'
Exclusions
The rule actively suppresses these predicates.
| Field | Kind | Excluded values | Search |
|---|---|---|---|
Signature | eq | Nextron Systems GmbH | excludes:Signature field:"Signature" value:"Nextron Systems GmbH" |
SignatureStatus | eq | valid | excludes:SignatureStatus field:"SignatureStatus" value:"valid" |
Signed | eq | true | excludes:Signed field:"Signed" value:"true" |
Indicators
These rows show field, operator, and value matches.
| Field | Kind | Values | Search |
|---|---|---|---|
Image | ends_with |
| field:"Image" kind:ends_with |
ImageLoaded | ends_with |
| field:"ImageLoaded" kind:ends_with |