diff --git a/rules/linux/defense_evasion_env_binary.toml b/rules/linux/defense_evasion_env_binary.toml new file mode 100644 index 000000000..cca34f51d --- /dev/null +++ b/rules/linux/defense_evasion_env_binary.toml @@ -0,0 +1,44 @@ +[metadata] +creation_date = "2022/02/24" +maturity = "production" +updated_date = "2022/02/24" + +[rule] +author = ["Elastic"] +description = "Identifies Linux binary env abuse to break out from restricted environments by spawning an interactive system shell" +from = "now-9m" +index = ["logs-endpoint.events.*"] +language = "eql" +license = "Elastic License v2" +name = "Linux Restricted Shell Breakout via env Shell Evasion" +references = ["https://gtfobins.github.io/gtfobins/env/"] +risk_score = 47 +rule_id = "72d33577-f155-457d-aad3-379f9b750c97" +severity = "medium" +tags = ["Elastic", "Host", "Linux", "Threat Detection", "Defense Evasion", "GTFOBins"] +timestamp_override = "event.ingested" +type = "eql" + +query = ''' +process where event.type == "start" and process.name : "env" and process.args_count == 2 and process.args : ("/bin/sh", "/bin/bash", "sh", "bash") +''' + + +[[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/" +