UNC4841 - Download Compressed Files From Temp.sh Using Wget

calendar Aug 12, 2024 · attack.defense-evasion attack.t1140 detection.emerging-threats  ·
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Detects execution of "wget" to download a ".zip" or ".rar" files from "temp.sh". As seen used by UNC4841 during their Barracuda ESG zero day exploitation.

Sigma rule (View on GitHub)

 1title: UNC4841 - Download Compressed Files From Temp.sh Using Wget
 2id: 60d050c4-e253-4d9a-b673-5ac100cfddfb
 3status: test
 4description: Detects execution of "wget" to download a ".zip" or ".rar" files from "temp.sh". As seen used by UNC4841 during their Barracuda ESG zero day exploitation.
 5references:
 6    - https://www.mandiant.com/resources/blog/barracuda-esg-exploited-globally
 7author: Nasreddine Bencherchali (Nextron Systems)
 8date: 2023-06-16
 9tags:
10    - attack.defense-evasion
11    - attack.t1140
12    - detection.emerging-threats
13logsource:
14    product: linux
15    category: process_creation
16detection:
17    selection:
18        Image|endswith: '/wget'
19        CommandLine|contains: 'https://temp.sh/'
20        CommandLine|endswith:
21            - '.rar'
22            - '.zip'
23    condition: selection
24falsepositives:
25    - Unknown
26level: high

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