Password Protected ZIP File Opened (Suspicious Filenames)


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.

Query · sigma

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

Known false positives

  • Legitimate used of encrypted ZIP files
Raw source Password Protected ZIP File Opened (Suspicious Filenames) · Sigma
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Published by SigmaHQ/sigma ↗, licensed under Detection Rule License 1.1 ↗. Reproduced here unmodified.
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

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