Shell Invocation via Env Command - Linux

calendar Sep 2, 2024 · attack.execution attack.t1059  ·
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Detects the use of the env command to invoke a shell. This may indicate an attempt to bypass restricted environments, escalate privileges, or execute arbitrary commands.

Sigma rule (View on GitHub)

 1title: Shell Invocation via Env Command - Linux
 2id: bed978f8-7f3a-432b-82c5-9286a9b3031a
 3status: experimental
 4description: |
 5        Detects the use of the env command to invoke a shell. This may indicate an attempt to bypass restricted environments, escalate privileges, or execute arbitrary commands.
 6references:
 7    - https://gtfobins.github.io/gtfobins/env/#shell
 8    - https://www.elastic.co/guide/en/security/current/linux-restricted-shell-breakout-via-linux-binary-s.html
 9author: Li Ling, Andy Parkidomo, Robert Rakowski, Blake Hartstein (Bloomberg L.P.)
10date: 2024-09-02
11tags:
12    - attack.execution
13    - attack.t1059
14logsource:
15    category: process_creation
16    product: linux
17detection:
18    selection:
19        Image|endswith: '/env'
20        CommandLine|endswith:
21            - '/bin/bash'
22            - '/bin/dash'
23            - '/bin/fish'
24            - '/bin/sh'
25            - '/bin/zsh'
26    condition: selection
27falsepositives:
28    - Github operations such as ghe-backup
29level: high

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