Password Protected ZIP File Opened (Email Attachment)

Description

Detects the extraction of password protected ZIP archives. See the filename variable for more details on which file has been opened.

Query · sigma

selection:
  EventID: 5379
  TargetName|contains|all:
  - Microsoft_Windows_Shell_ZipFolder:filename
  - \Temporary Internet Files\Content.Outlook
condition: selection

Known false positives

  • Legitimate used of encrypted ZIP files
Raw source Password Protected ZIP File Opened (Email Attachment) · 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 (Email Attachment)
id: 571498c8-908e-40b4-910b-d2369159a3da
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.initial-access
    - attack.stealth
    - attack.t1027
    - attack.t1566.001
logsource:
    product: windows
    service: security
detection:
    selection:
        EventID: 5379
        TargetName|contains|all:
            - 'Microsoft_Windows_Shell_ZipFolder:filename'
            - '\Temporary Internet Files\Content.Outlook'
    condition: selection
falsepositives:
    - Legitimate used of encrypted ZIP files
level: high

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