Wget Creating Files in Tmp Directory

Title: Wget Creating Files in Tmp Directory
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
modified:None
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