title: Potential Perl Reverse Shell Execution
id: 259df6bc-003f-4306-9f54-4ff1a08fa38e
status: test
description: Detects execution of the perl binary with the "-e" flag and common strings related to potential reverse shell activity
references:
    - https://pentestmonkey.net/cheat-sheet/shells/reverse-shell-cheat-sheet
    - https://www.revshells.com/
author: '@d4ns4n_, Nasreddine Bencherchali (Nextron Systems)'
date: 2023-04-07
tags:
    - attack.execution
logsource:
    category: process_creation
    product: linux
detection:
    selection_img:
        Image|endswith: '/perl'
        CommandLine|contains: ' -e '
    selection_content:
        - CommandLine|contains|all:
              - 'fdopen('
              - '::Socket::INET'
        - CommandLine|contains|all:
              - 'Socket'
              - 'connect'
              - 'open'
              - 'exec'
    condition: all of selection_*
falsepositives:
    - Unlikely
level: high

title: Perl Inline Command Execution
id: f426547a-e0f7-441a-b63e-854ac5bdf54d
status: test
description: Detects execution of perl using the "-e"/"-E" flags. This is could be used as a way to launch a reverse shell or execute live perl code.
references:
    - https://pentestmonkey.net/cheat-sheet/shells/reverse-shell-cheat-sheet
    - https://www.revshells.com/
author: Nasreddine Bencherchali (Nextron Systems)
date: 2023-01-02
tags:
    - attack.execution
    - attack.t1059
logsource:
    category: process_creation
    product: windows
detection:
    selection_img:
        - Image|endswith: '\perl.exe'
        - OriginalFileName: 'perl.exe' # Also covers perlX.XX.exe
    selection_cli:
        CommandLine|contains: ' -e'
    condition: all of selection_*
falsepositives:
    - Unknown
level: medium