Password Protected ZIP File Opened — Sigma Rule

Rule metadata and linked tags

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

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

Pinned original Sigma rule · Detection Rule License 1.1

Source SHA-256: 04473d9ced42ab8b8d8029199e0cebddded13168063e8ab96ad19df326dcd4a5

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
id: 00ba9da1-b510-4f6b-b258-8d338836180f
status: test
description: Detects the extraction of password protected ZIP archives. 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.stealth
    - attack.t1027
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 5379
        TargetName|contains: 'Microsoft_Windows_Shell_ZipFolder:filename'
    filter:  # avoid overlaps with 54f0434b-726f-48a1-b2aa-067df14516e4
        TargetName|contains: '\Temporary Internet Files\Content.Outlook'
    condition: selection and not filter
falsepositives:
    - Legitimate used of encrypted ZIP files
level: medium

Original YAML and metadata in JSON

False positives

• Legitimate used of encrypted ZIP files

Source references

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