diff --git a/rules/linux/defense_evasion_nice_binary.toml b/rules/linux/defense_evasion_nice_binary.toml new file mode 100644 index 000000000..9cb6b2e06 --- /dev/null +++ b/rules/linux/defense_evasion_nice_binary.toml @@ -0,0 +1,50 @@ +[metadata] +creation_date = "2022/03/07" +maturity = "development" +updated_date = "2022/03/07" + +[rule] +author = ["Elastic"] +description = """ +Identifies Linux binary nice 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 nice Shell evasion" +references = ["https://gtfobins.github.io/gtfobins/nice/"] +risk_score = 47 +rule_id = "22755f7f-1e1e-4528-a75f-bb3f4026d1b9" +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 event.type == "start" and process.name == "nice" and process.args : ("/bin/bash", "/bin/sh", "/bin/dash", "sh", "bash", "dash")] +[process where process.name : ("bash", "sh", "dash")] +''' + + +[[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/" +