sigmamediumHunting

7Zip Compressing Dump Files

Detects execution of 7z in order to compress a file with a ".dmp"/".dump" extension, which could be a step in a process of dump file exfiltration.

MITRE ATT&CK

T1560.001

collection

Detection Query

selection_img:
  - Description|contains: 7-Zip
  - Image|endswith:
      - \7z.exe
      - \7zr.exe
      - \7za.exe
  - OriginalFileName:
      - 7z.exe
      - 7za.exe
selection_extension:
  CommandLine|contains:
    - .dmp
    - .dump
    - .hdmp
condition: all of selection_*

Author

Nasreddine Bencherchali (Nextron Systems)

Created

2022-09-27

Data Sources

windowsProcess Creation Events

Platforms

windows

References

https://thedfirreport.com/2022/09/26/bumblebee-round-two/

Tags

attack.collectionattack.t1560.001

Raw Content

title: 7Zip Compressing Dump Files
id: ec570e53-4c76-45a9-804d-dc3f355ff7a7
related:
    - id: 1ac14d38-3dfc-4635-92c7-e3fd1c5f5bfc
      type: derived
status: test
description: Detects execution of 7z in order to compress a file with a ".dmp"/".dump" extension, which could be a step in a process of dump file exfiltration.
references:
    - https://thedfirreport.com/2022/09/26/bumblebee-round-two/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2022-09-27
modified: 2023-09-12
tags:
    - attack.collection
    - attack.t1560.001
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_extension:
        CommandLine|contains:
            - '.dmp'
            - '.dump'
            - '.hdmp'
    condition: all of selection_*
falsepositives:
    - Legitimate use of 7z with a command line in which ".dmp" or ".dump" appears accidentally
    - Legitimate use of 7z to compress WER ".dmp" files for troubleshooting
level: medium