Sigma rule: Password Protected ZIP File Opened (Email Attachment)

A detection rule from the SigmaHQ repository, shown as its author published it. Dataset version ref-c1d44812284f, updated 2022-05-09T00:00:00.000Z.

Rule

Title
Password Protected ZIP File Opened (Email Attachment)
Status
test
Level
high
Author
Florian Roth (Nextron Systems)
Date
2022-05-09
File
rules/windows/builtin/security/win_security_susp_opened_encrypted_zip_outlook.yml
Commit
ccbb0369507f796db0b0ae6854c8a2be471b9d84

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

Log source

product
windows
service
security

Detection

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

False positives (as the rule lists them)

  • Legitimate used of encrypted ZIP files

Tags

  • attack.initial-access
  • attack.stealth
  • attack.t1027
  • attack.t1566.001

MITRE ATT&CK ids this rule names

References

Read on 2026-11-03T00:58:21.399Z under licence sigma-drl-1.1@d5f4c36a from https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/security/win_security_susp_opened_encrypted_zip_outlook.yml

Sources and licences

  • SigmaHQ

    "Password Protected ZIP File Opened (Email Attachment)" by Florian Roth (Nextron Systems) (SigmaHQ). Rule: https://github.com/SigmaHQ/sigma/blob/ccbb0369507f796db0b0ae6854c8a2be471b9d84/rules/windows/builtin/security/win_security_susp_opened_encrypted_zip_outlook.yml.
    Licensed under the Detection Rule License (DRL) 1.1: https://github.com/SigmaHQ/Detection-Rule-License

    Detection Rule License (DRL) 1.1

Cite this page

Dragons Eye Ransomware Tracker, "Sigma rule: Password Protected ZIP File Opened (Email Attachment)",
entity page, dataset version ref-c1d44812284f, updated 2022-05-09T00:00:00.000Z,
https://ransomware-tracker.com/detections/sigma/571498c8-908e-40b4-910b-d2369159a3da (accessed 2026-11-03).
Underlying source: SigmaHQ rule 571498c8-908e-40b4-910b-d2369159a3da, commit ccbb0369507f796db0b0ae6854c8a2be471b9d84.

Pages change. The dataset version identifies the data, but no archive of old versions is kept, so this citation cannot be replayed later.