Linux Restricted Shell Breakout via apt/apt-get Changelog Escape
editLinux Restricted Shell Breakout via apt/apt-get Changelog Escape
editIdentifies Linux binary apt/apt-get abuse to breakout out of restricted shells or environments by spawning an interactive system shell. The apt utility allows us to manage installation and removal of softwares on Debian based Linux distributions and the activity of spawning shell is not a standard use of this binary for a user or system administrator. It indicates a potentially malicious actor attempting to improve the capabilities or stability of their access.
Rule type: eql
Rule indices:
- logs-endpoint.events.*
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:
- Elastic
- Host
- Linux
- Threat Detection
- Execution
- GTFOBins
Version: 1
Rule authors:
- Elastic
Rule license: Elastic License v2
Rule query
editprocess where event.type == "start" and process.name == "sensible-pager" and process.args in ("/bin/sh", "/bin/bash", "/bin/dash", "sh", "bash", "dash") and process.parent.name in ("apt", "apt-get") and process.parent.args == "changelog"
Framework: MITRE ATT&CKTM
-
Tactic:
- Name: Execution
- ID: TA0002
- Reference URL: https://attack.mitre.org/tactics/TA0002/
-
Technique:
- Name: Command and Scripting Interpreter
- ID: T1059
- Reference URL: https://attack.mitre.org/techniques/T1059/
-
Sub-technique:
- Name: Unix Shell
- ID: T1059.004
- Reference URL: https://attack.mitre.org/techniques/T1059/004/