diff --git a/rules/linux/defense_evasion_find_binary.toml b/rules/linux/defense_evasion_find_binary.toml new file mode 100644 index 000000000..ccc0567af --- /dev/null +++ b/rules/linux/defense_evasion_find_binary.toml @@ -0,0 +1,46 @@ +[metadata] +creation_date = "2022/02/28" +maturity = "production" +updated_date = "2022/02/28" + +[rule] +author = ["Elastic"] +description = "Identifies Linux binary find abuse to break out from restricted environments by spawning an interactive system shell. This activity is not standard use with this binary for 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 the find command" +references = ["https://gtfobins.github.io/gtfobins/find/"] +risk_score = 47 +rule_id = "6f683345-bb10-47a7-86a7-71e9c24fb358" +severity = "medium" +tags = ["Elastic", "Host", "Linux", "Threat Detection", "Defense Evasion", "GTFOBins"] +timestamp_override = "event.ingested" +type = "eql" + +query = ''' +sequence by host.id, process.pid with maxspan=1m +[process where process.name == "find" and process.args : "-exec" and process.args : ("/bin/bash", "/bin/sh", "bash", "sh") and process.args : ";"] +[process where process.parent.name == "find" and process.name : ("bash", "sh")] +''' + + +[[rule.threat]] +framework = "MITRE ATT&CK" +[[rule.threat.technique]] +id = "T1548" +name = "Abuse Elevation Control Mechanism" +reference = "https://attack.mitre.org/techniques/T1548/" +[[rule.threat.technique.subtechnique]] +id = "T1548.004" +name = "Elevated Execution with Prompt" +reference = "https://attack.mitre.org/techniques/T1548/004/" + + + +[rule.threat.tactic] +id = "TA0005" +name = "Defense Evasion" +reference = "https://attack.mitre.org/tactics/TA0005/" +