Shell Execution via Flock - Linux

calendar Sep 2, 2024 · attack.discovery attack.t1083  ·
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Detects the use of the "flock" command to execute a shell. Such behavior may be associated with privilege escalation, unauthorized command execution, or to break out from restricted environments.

Sigma rule (View on GitHub)

 1title: Shell Execution via Flock - Linux
 2id: 4b09c71e-4269-4111-9cdd-107d8867f0cc
 3status: experimental
 4description: |
 5        Detects the use of the "flock" command to execute a shell. Such behavior may be associated with privilege escalation, unauthorized command execution, or to break out from restricted environments.
 6references:
 7    - https://gtfobins.github.io/gtfobins/flock/#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.discovery
13    - attack.t1083
14logsource:
15    category: process_creation
16    product: linux
17detection:
18    selection_img:
19        Image|endswith: '/flock'
20        CommandLine|contains: ' -u '
21    selection_cli:
22        CommandLine|contains:
23            - '/bin/bash'
24            - '/bin/dash'
25            - '/bin/fish'
26            - '/bin/sh'
27            - '/bin/zsh'
28    condition: all of selection_*
29falsepositives:
30    - Unknown
31level: high

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