title: Data Compressed - rar.exe
author: Timur Zinniatullin, E.M. Anhaus, oscd.community
date: 2019/10/21
description: An adversary may compress data (e.g., sensitive documents) that is collected
    prior to exfiltration in order to make it portable and minimize the amount of
    data sent over the network.
detection:
    SELECTION_1:
        EventID: 1
    SELECTION_2:
        Image: '*\rar.exe'
    SELECTION_3:
        CommandLine: '* a *'
    condition: (SELECTION_1 and SELECTION_2 and SELECTION_3)
falsepositives:
- Highly likely if rar is a default archiver in the monitored environment.
fields:
- Image
- CommandLine
- User
- LogonGuid
- Hashes
- ParentProcessGuid
- ParentCommandLine
id: 6f3e2987-db24-4c78-a860-b4f4095a7095
level: low
logsource:
    category: process_creation
    product: windows
modified: 2020/08/29
references:
- https://github.com/redcanaryco/atomic-red-team/blob/master/atomics/T1560.001/T1560.001.md
- https://eqllib.readthedocs.io/en/latest/analytics/1ec33c93-3d0b-4a28-8014-dbdaae5c60ae.html
status: experimental
tags:
- attack.exfiltration
- attack.t1002
- attack.collection
- attack.t1560.001
yml_filename: win_data_compressed_with_rar.yml
yml_path: /Users/user/Documents/YamatoSecurity/sigma/rules/windows/process_creation