Defense Evasion (TA0005)(external, opens in a new tab or window)
text code block:process where ((problemchild.prediction == 1 and problemchild.prediction_probability > 0.98) or blocklist_label == 1) and not process.args : ("*C:\\WINDOWS\\temp\\nessus_*.txt*", "*C:\\WINDOWS\\temp\\nessus_*.tmp*") and process.parent.executable != null and not user.id in ("S-1-5-18", "S-1-5-19", "S-1-5-20") and not process.parent.name : ("cmd.exe", "powershell.exe", "Perplexity.exe", "vmtoolsd.exe", "Code.exe", "explorer.exe", "git.exe") and not (process.name : "msedgewebview2.exe" and process.parent.name : "msedgewebview2.exe") and not (process.name : "opera.exe" and process.parent.name : "opera.exe") and not (process.parent.executable : "C:\\Windows\\System32\\svchost.exe" and process.name : ("UCPDMgr.exe", "sdbinst.exe", "gpupdate.exe", "rundll32.exe", "taskhostw.exe", "taskeng.exe", "rdpclip.exe", "firefox.exe", "w3wp.exe")) and not process.executable : ("C:\\Program Files\\*.exe", "C:\\Program Files (x86)\\*.exe") and not (process.name : "MpCmdRun.exe" and process.parent.name : ("MsMpEng.exe", "MpCmdRun.exe", "svchost.exe"))
Install detection rules in Elastic Security
Detect Machine Learning Detected a Suspicious Windows Event with a High Malicious Probability Score in the Elastic Security detection engine by installing this rule into your Elastic Stack.
To setup this rule, check out the installation guide for Prebuilt Security Detection Rules(external, opens in a new tab or window).