Defense Evasion (TA0005)(external, opens in a new tab or window)
text code block:sequence by host.id with maxspan=1m [process where host.os.type == "windows" and event.code == "1" and /* sysmon process creation */ process.parent.name : ("winword.exe", "excel.exe", "outlook.exe", "powerpnt.exe", "eqnedt32.exe", "fltldr.exe", "mspub.exe", "msaccess.exe","cscript.exe", "wscript.exe", "rundll32.exe", "regsvr32.exe", "mshta.exe", "wmic.exe", "cmstp.exe", "msxsl.exe") and /* noisy FP patterns */ not (process.parent.name : "EXCEL.EXE" and process.executable : "?:\\Program Files\\Microsoft Office\\root\\Office*\\ADDINS\\*.exe") and not (process.executable : "?:\\Windows\\splwow64.exe" and process.args in ("8192", "12288") and process.parent.name : ("winword.exe", "excel.exe", "outlook.exe", "powerpnt.exe")) and not (process.parent.name : "rundll32.exe" and process.parent.args : ("?:\\WINDOWS\\Installer\\MSI*.tmp,zzzzInvokeManagedCustomActionOutOfProc", "--no-sandbox")) and not (process.executable : ("?:\\Program Files (x86)\\Microsoft\\EdgeWebView\\Application\\*\\msedgewebview2.exe", "?:\\Program Files\\Adobe\\Acrobat DC\\Acrobat\\Acrobat.exe", "?:\\Windows\\SysWOW64\\DWWIN.EXE") and process.parent.name : ("winword.exe", "excel.exe", "outlook.exe", "powerpnt.exe")) and not (process.parent.name : "regsvr32.exe" and process.parent.args : ("?:\\Program Files\\*", "?:\\Program Files (x86)\\*")) ] by process.parent.entity_id, process.entity_id [process where host.os.type == "windows" and event.code == "10" and /* Sysmon process access event from unknown module */ winlog.event_data.CallTrace : "*UNKNOWN*"] by process.entity_id, winlog.event_data.TargetProcessGUID
Install detection rules in Elastic Security
Detect Suspicious Process Creation CallTrace 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).