Password Protected ZIP File Opened (Suspicious Filenames) — Sigma Rule

Rule metadata and linked tags

Author: Florian Roth (Nextron Systems). Source status: test; severity: high. Source dates: 2022-05-09 / not supplied.

{
  "product": "windows",
  "service": "security"
}

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: e64115bc39b3703e470cc0ef98f578824d4cf3a756d46606dbf7bae8ee7e1268

Detection logic

Original source YAML. Source-tag agreement is not proof of complete semantic coverage. This rule has not been compiled for a SIEM backend or validated against live telemetry here.

title: Password Protected ZIP File Opened (Suspicious Filenames)
id: 54f0434b-726f-48a1-b2aa-067df14516e4
status: test
description: Detects the extraction of password protected ZIP archives with suspicious file names. See the filename variable for more details on which file has been opened.
references:
    - https://twitter.com/sbousseaden/status/1523383197513379841
author: Florian Roth (Nextron Systems)
date: 2022-05-09
tags:
    - attack.command-and-control
    - attack.stealth
    - attack.t1027
    - attack.t1105
    - attack.t1036
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 5379
        TargetName|contains: 'Microsoft_Windows_Shell_ZipFolder:filename'
    selection_filename:
        TargetName|contains:
            - 'invoice'
            - 'new order'
            - 'rechnung'
            - 'factura'
            - 'delivery'
            - 'purchase'
            - 'order'
            - 'payment'
    condition: selection and selection_filename
falsepositives:
    - Legitimate used of encrypted ZIP files
level: high

Original YAML and metadata in JSON

False positives

• Legitimate used of encrypted ZIP files

Source references

• https://twitter.com/sbousseaden/status/1523383197513379841