Python Spawning Pretty TTY on Windows

Severity: high
Author: Nextron Systems
Source: upstream

Detects python spawning a pretty tty

MITRE ATT&CK coverage

Tactic	Techniques
Execution	`T1059` Command and Scripting Interpreter

Event coverage

Provider	Event ID	Title
Sysmon	1	Process creation
Security-Auditing	4688	A new process has been created.

Stages and Predicates

Stage 1: `selection_img`

or:
Image|endswith: python.exe
Image|endswith: python2.exe
Image|endswith: python3.exe

Stage 2: `1 of selection_cli_1`

CommandLine|contains: '.spawn('
CommandLine|contains: 'import pty'

Stage 3: `1 of selection_cli_2`

CommandLine|contains: 'from pty import spawn'

Indicators

Each row is a field, operator, and value that the rule matches. The corpus column counts how many other rules in the catalog look for the same combination: high numbers point to widely-used, community-vetted indicators. Blank or 1 shows that the indicator is specific to this rule.

Field	Kind	Values
`CommandLine`	match	`.spawn(` `from pty import spawn` `import pty`
`Image`	ends_with	`python.exe` corpus 2 (sigma 2) `python2.exe` corpus 2 (sigma 2) `python3.exe` corpus 2 (sigma 2)