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Detection rules › Sigma

Password Protected ZIP File Opened (Email Attachment)

Status
test
Severity
high
Log source
product windows, service security
Author
Florian Roth (Nextron Systems)
Source
github.com/SigmaHQ/sigma

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

Known false positives

  • Legitimate used of encrypted ZIP files

MITRE ATT&CK coverage

TacticTechniques
Initial Access
Stealth

Telemetry coverage

ProviderRecord / event type
Security-AuditingEvent ID 5379: Credential Manager credentials were read.

Rule body

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

Stages and Predicates

Stage 0: condition

selection

Stage 1: selection

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

Indicators

These rows show field, operator, and value matches.

FieldKindValuesSearch
TargetNamematch
  • Microsoft_Windows_Shell_ZipFolder:filename corpus 3 (sigma 3)
  • \Temporary Internet Files\Content.Outlook
field:"TargetName" kind:match