sigmalowHunting

Password Protected Compressed File Extraction Via 7Zip

Detects usage of 7zip utilities (7z.exe, 7za.exe and 7zr.exe) to extract password protected zip files.

MITRE ATT&CK

collection

Detection Query

selection_img:
  - Description|contains: 7-Zip
  - Image|endswith:
      - \7z.exe
      - \7zr.exe
      - \7za.exe
  - OriginalFileName:
      - 7z.exe
      - 7za.exe
selection_password:
  CommandLine|contains|all:
    - " -p"
    - " x "
    - " -o"
condition: all of selection_*

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2023-03-10

Data Sources

windowsProcess Creation Events

Platforms

windows

References

https://blog.cyble.com/2022/06/07/bumblebee-loader-on-the-rise/

Tags

attack.collectionattack.t1560.001detection.threat-hunting

Raw Content

title: Password Protected Compressed File Extraction Via 7Zip
id: b717b8fd-6467-4d7d-b3d3-27f9a463af77
status: test
description: Detects usage of 7zip utilities (7z.exe, 7za.exe and 7zr.exe) to extract password protected zip files.
references:
    - https://blog.cyble.com/2022/06/07/bumblebee-loader-on-the-rise/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-03-10
modified: 2024-07-16
tags:
    - attack.collection
    - attack.t1560.001
    - detection.threat-hunting
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Description|contains: '7-Zip'
        - Image|endswith:
              - '\7z.exe'
              - '\7zr.exe'
              - '\7za.exe'
        - OriginalFileName:
              - '7z.exe'
              - '7za.exe'
    selection_password:
        CommandLine|contains|all:
            - ' -p'
            - ' x '
            - ' -o'
    condition: all of selection_*
falsepositives:
    - Legitimate activity is expected since extracting files with a password can be common in some environment.
level: low