Elastic medium stable eql

Suspicious MS Office Child Process

Identifies suspicious child processes of frequently targeted Microsoft Office applications (Word, PowerPoint, Excel). These child processes are often launched during exploitation of Office applications or from documents with malicious macros.

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Detection Logic

process where host.os.type == "windows" and event.type == "start" and
  process.parent.name : (
      "eqnedt32.exe", "excel.exe", "fltldr.exe", "msaccess.exe",
      "mspub.exe", "powerpnt.exe", "winword.exe", "outlook.exe"
  ) and
  process.name : (
      "Microsoft.Workflow.Compiler.exe", "arp.exe", "atbroker.exe", "bginfo.exe", "bitsadmin.exe", "cdb.exe",
      "certutil.exe", "cmd.exe", "cmstp.exe", "control.exe", "cscript.exe", "csi.exe", "dnx.exe", "dsget.exe",
      "dsquery.exe", "forfiles.exe", "fsi.exe", "ftp.exe", "gpresult.exe", "hostname.exe", "ieexec.exe", "iexpress.exe",
      "installutil.exe", "ipconfig.exe", "mshta.exe", "msxsl.exe", "nbtstat.exe", "net.exe", "net1.exe", "netsh.exe",
      "netstat.exe", "nltest.exe", "odbcconf.exe", "ping.exe", "powershell.exe", "pwsh.exe", "qprocess.exe",
      "quser.exe", "qwinsta.exe", "rcsi.exe", "reg.exe", "regasm.exe", "regsvcs.exe", "regsvr32.exe", "sc.exe",
      "schtasks.exe", "systeminfo.exe", "tasklist.exe", "tracert.exe", "whoami.exe", "wmic.exe", "wscript.exe",
      "xwizard.exe", "explorer.exe", "rundll32.exe", "hh.exe", "msdt.exe"
  ) and
  not (
    process.parent.name : "outlook.exe" and
    process.name : "rundll32.exe" and
    process.args : "shell32.dll,Control_RunDLL" and
    process.args : "srchadmin.dll"
  )

Field Validations

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