Detectionmediumtest

Suspicious Unblock-File

Remove the Zone.Identifier alternate data stream which identifies the file as downloaded from the internet.

Convert In Phoenix Studio

Open this Sigma rule in the converter with the YAML preloaded and ready for backend selection.

François HubautCreated Tue Feb 015947497f-1aa4-41dd-9693-c9848d58727dwindows

Log Source

WindowsPowerShell Script

ProductWindows← raw: windows

CategoryPowerShell Script← raw: ps_script

Definition

Requirements: Script Block Logging must be enabled

Detection Logic

detection:
    selection:
        ScriptBlockText|contains|all:
            - 'Unblock-File '
            - '-Path '
    condition: selection

False Positives

Legitimate PowerShell scripts

References

MITRE ATT&CK

Tactics

Sub-techniques

Rule Metadata

Rule ID

5947497f-1aa4-41dd-9693-c9848d58727d

Status

test

Level

medium

Type

Detection

Created

Tue Feb 01

Author

Path

rules/windows/powershell/powershell_script/posh_ps_susp_unblock_file.yml

Raw Tags

attack.defense-evasionattack.t1553.005