Detection rules › Sigma
Suspicious Unsigned Thor Scanner Execution
Detects loading and execution of an unsigned thor scanner binary.
MITRE ATT&CK coverage
| Tactic | Techniques |
|---|---|
| Execution | T1574.001 Hijack Execution Flow: DLL |
| Stealth | T1574.001 Hijack Execution Flow: DLL |
Event coverage
| Provider | Event | Title |
|---|---|---|
| Sysmon | Event ID 7 | Image loaded |
Rule body yaml
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
Top-level NOT(...) conjuncts: predicates this rule actively suppresses.
| Field | Kind | Excluded values |
|---|---|---|
Signature | eq | Nextron Systems GmbH |
SignatureStatus | eq | valid |
Signed | eq | true |
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.
| Field | Kind | Values |
|---|---|---|
Image | ends_with |
|
ImageLoaded | ends_with |
|