Sigma Rule Library

Data Compressed

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.

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Detection logic

selection1

type: execve
a0: zip

selection2

type: execve
a0: gzip
a1: -k

selection3

type: execve
a0: tar
a1|contains: -c

Condition

1 of selection*

Raw YAML

title: Data Compressed
id: a3b5e3e9-1b49-4119-8b8e-0344a01f21ee
status: test
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.
references:
    - https://github.com/redcanaryco/atomic-red-team/blob/a78b9ed805ab9ea2e422e1aa7741e9407d82d7b1/atomics/T1560.001/T1560.001.md
author: Timur Zinniatullin, oscd.community
date: 2019-10-21
modified: 2023-07-28
tags:
    - attack.exfiltration
    - attack.collection
    - attack.t1560.001
logsource:
    product: linux
    service: auditd
detection:
    selection1:
        type: 'execve'
        a0: 'zip'
    selection2:
        type: 'execve'
        a0: 'gzip'
        a1: '-k'
    selection3:
        type: 'execve'
        a0: 'tar'
        a1|contains: '-c'
    condition: 1 of selection*
falsepositives:
    - Legitimate use of archiving tools by legitimate user.
level: low

False positives

  • Legitimate use of archiving tools by legitimate user.

References

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