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Detectionmediumtest

Python Spawning Pretty TTY Via PTY Module

Detects a python process calling to the PTY module in order to spawn a pretty tty which could be indicative of potential reverse shell activity.

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Launch
Nextron SystemsCreated Fri Jun 03Updated Mon Nov 04c4042d54-110d-45dd-a0e1-05c47822c937linux
Log Source
LinuxProcess Creation
ProductLinux← raw: linux
CategoryProcess Creation← raw: process_creation

Events generated when a new process is spawned on the system. Covers command-line arguments, parent/child relationships, and process metadata.

Detection Logic
Detection Logic3 selectors
detection:
    selection_img:
        - Image|endswith:
              - '/python'
              - '/python2'
              - '/python3'
        - Image|contains:
              - '/python2.'  # python image is always of the form ../python3.10; ../python is just a symlink
              - '/python3.'
    selection_cli_import:
        CommandLine|contains:
            - 'import pty'
            - 'from pty '
    selection_cli_spawn:
        CommandLine|contains: 'spawn'
    condition: all of selection_*
False Positives
Unknown

False positive likelihood has not been assessed. Additional context may be needed during triage.

References
1
Resolving title…
volexity.com
MITRE ATT&CK
Related Rules
SimilarDetectionhigh

Python Reverse Shell Execution Via PTY And Socket Modules

Detects the execution of python with calls to the socket and pty module in order to connect and spawn a potential reverse shell.

Detects similar activity. Both rules may fire on overlapping events.

Rule Metadata
Rule ID
c4042d54-110d-45dd-a0e1-05c47822c937
Status
test
Level
medium
Type
Detection
Created
Fri Jun 03
Modified
Mon Nov 04
Author
Nextron Systems
Path
rules/linux/process_creation/proc_creation_lnx_python_pty_spawn.yml
Raw Tags
attack.executionattack.t1059
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