diff --git a/rules/linux/execution_crash_binary.toml b/rules/linux/execution_crash_binary.toml new file mode 100644 index 000000000..cd81a0468 --- /dev/null +++ b/rules/linux/execution_crash_binary.toml @@ -0,0 +1,51 @@ +[metadata] +creation_date = "2022/03/21" +maturity = "production" +updated_date = "2022/03/21" + +[rule] +author = ["Elastic"] +description = """ +Identifies Linux binary crash abuse to break out from restricted environments by spawning an interactive system +shell.The crash utility helps to analyze Linux crash dump data or a live system and the activity of spawing a shell is +not a standard use of this binary by a user or system administrator. It indicates a potentially malicious actor +attempting to improve the capabilities or stability of their access. +""" +from = "now-9m" +index = ["logs-endpoint.events.*"] +language = "eql" +license = "Elastic License v2" +name = "Linux Restricted Shell Breakout via crash Shell evasion" +references = ["https://gtfobins.github.io/gtfobins/crash/"] +risk_score = 47 +rule_id = "ee619805-54d7-4c56-ba6f-7717282ddd73" +severity = "medium" +tags = ["Elastic", "Host", "Linux", "Threat Detection", "Execution", "GTFOBins"] +timestamp_override = "event.ingested" +type = "eql" + +query = ''' +sequence by host.id, process.pid with maxspan=1m +[process where event.type == "start" and process.name == "crash" and process.args : "-h"] +[process where process.parent.name == "crash" and process.name : "sh"] +''' + + +[[rule.threat]] +framework = "MITRE ATT&CK" +[[rule.threat.technique]] +id = "T1059" +name = "Command and Scripting Interpreter" +reference = "https://attack.mitre.org/techniques/T1059/" +[[rule.threat.technique.subtechnique]] +id = "T1059.004" +name = "Unix Shell" +reference = "https://attack.mitre.org/techniques/T1059/004/" + + + +[rule.threat.tactic] +id = "TA0002" +name = "Execution" +reference = "https://attack.mitre.org/tactics/TA0002/" +