sigmamediumHunting

Wget Creating Files in Tmp Directory

Detects the use of wget to download content in a temporary directory such as "/tmp" or "/var/tmp"

MITRE ATT&CK

command-and-control

Detection Query

selection:
  Image|endswith: /wget
  TargetFilename|startswith:
    - /tmp/
    - /var/tmp/
condition: selection

Author

Joseliyo Sanchez, @Joseliyo_Jstnk

Created

2023-06-02

Data Sources

linuxFile Events

Platforms

linux

References

Tags

attack.command-and-controlattack.t1105

Raw Content

title: Wget Creating Files in Tmp Directory
id: 35a05c60-9012-49b6-a11f-6bab741c9f74
status: test
description: Detects the use of wget to download content in a temporary directory such as "/tmp" or "/var/tmp"
references:
    - https://blogs.jpcert.or.jp/en/2023/05/gobrat.html
    - https://jstnk9.github.io/jstnk9/research/GobRAT-Malware/
    - https://www.virustotal.com/gui/file/60bcd645450e4c846238cf0e7226dc40c84c96eba99f6b2cffcd0ab4a391c8b3/detection
    - https://www.virustotal.com/gui/file/3e44c807a25a56f4068b5b8186eee5002eed6f26d665a8b791c472ad154585d1/detection
author: Joseliyo Sanchez, @Joseliyo_Jstnk
date: 2023-06-02
tags:
    - attack.command-and-control
    - attack.t1105
logsource:
    product: linux
    category: file_event
detection:
    selection:
        Image|endswith: '/wget'
        TargetFilename|startswith:
            - '/tmp/'
            - '/var/tmp/'
    condition: selection
falsepositives:
    - Legitimate downloads of files in the tmp folder.
level: medium