IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
ROT Encoded Python Script Execution
editROT Encoded Python Script Execution
editIdentifies the execution of a Python script that uses the ROT cipher for letters substitution. Adversaries may use this method to encode and obfuscate part of their malicious code in legit python packages.
Rule type: eql
Rule indices:
- logs-endpoint.events.process-*
- logs-endpoint.events.file-*
Severity: medium
Risk score: 47
Runs every: 5m
Searches indices from: now-9m (Date Math format, see also Additional look-back time)
Maximum alerts per execution: 100
References:
Tags:
- Domain: Endpoint
- OS: Windows
- OS: macOS
- Use Case: Threat Detection
- Tactic: Defense Evasion
- Data Source: Elastic Defend
Version: 1
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editsequence by process.entity_id with maxspan=1m
[process where host.os.type in ("windows", "macos") and event.type == "start" and process.name : "python*"]
[file where host.os.type in ("windows", "macos") and
event.action != "deletion" and process.name : "python*" and file.name : "rot_??.cpython-*.pyc*"]
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Defense Evasion
- ID: TA0005
- Reference URL: https://attack.mitre.org/tactics/TA0005/
-
Technique:
- Name: Deobfuscate/Decode Files or Information
- ID: T1140
- Reference URL: https://attack.mitre.org/techniques/T1140/
-
Technique:
- Name: Obfuscated Files or Information
- ID: T1027
- Reference URL: https://attack.mitre.org/techniques/T1027/
-
Sub-technique:
- Name: Encrypted/Encoded File
- ID: T1027.013
- Reference URL: https://attack.mitre.org/techniques/T1027/013/