Elastic low stable eql
Machine Learning Detected a Suspicious Windows Event with a Low Malicious Probability Score
A supervised machine learning model (ProblemChild) has identified a suspicious Windows process event with low probability of it being malicious activity. Alternatively, the model's blocklist identified the event as being malicious.
Detection Logic
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") and
not (process.name == "net1.exe" and process.parent.name == "net.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")) and
not (process.name: ("powershell.exe", "cmd.exe", "cscript.exe") and
process.parent.executable : ("C:\\Program Files\\*.exe",
"C:\\Program Files (x86)\\*.exe",
"C:\\Users\\*\\Documents\\scripts\\nssm-2.24\\win64\\nssm.exe",
"C:\\Windows\\System32\\cmd.exe",
"C:\\Windows\\SysWOW64\\cmd.exe",
"C:\\Windows\\CCM\\CcmExec.exe",
"C:\\Windows\\System32\\svchost.exe",
"C:\\Windows\\System32\\gpscript.exe",
"C:\\Windows\\System32\\wbem\\WmiPrvSE.exe",
"C:\\appian\\java\\bin\\java.exe")) and
not (process.executable : "C:\\Windows\\System32\\cscript.exe" and process.parent.name : ("node.exe", "MicroStrategy Services.exe")) and
not (process.name : "MpCmdRun.exe" and process.parent.name : ("MsMpEng.exe", "MpCmdRun.exe", "svchost.exe")) and
not process.executable : ("C:\\Program Files\\*.exe", "C:\\Program Files (x86)\\*.exe") Field Validations
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