Sigma rule: Suspicious Unsigned Thor Scanner Execution

Rule

Title

Suspicious Unsigned Thor Scanner Execution

Status

stable

Level

high

Author

Nasreddine Bencherchali (Nextron Systems)

Date

2023-10-29

File

rules/windows/image_load/image_load_thor_unsigned_execution.yml

Commit

ccbb0369507f796db0b0ae6854c8a2be471b9d84

Detects loading and execution of an unsigned thor scanner binary.

Log source

product

windows

category

image_load

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

False positives (as the rule lists them)

• Other legitimate binaries named "thor.exe" that aren't published by Nextron Systems

Tags

• attack.privilege-escalation
• attack.persistence
• attack.execution
• attack.stealth
• attack.t1574.001

MITRE ATT&CK ids this rule names

• T1574.001

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/windows/image_load/image_load_thor_unsigned_execution.yml