Elastic high stable eql

Suspicious Windows Command Shell Arguments

Identifies the execution of the Windows Command Shell process (cmd.exe) with suspicious argument values. This behavior is often observed during malware installation.

View Source

Detection Logic

process where host.os.type == "windows" and event.type == "start" and
  process.name : "cmd.exe" and
  (
    process.command_line : (
        "*).Run(*", "*GetObject*", "* curl*regsvr32*", "*echo*wscript*", "*echo*ZONE.identifier*",
        "*ActiveXObject*", "*dir /s /b *echo*", "*unescape(*",  "*findstr*TVNDRgAAAA*", "*findstr*passw*", "*start*\\\\*\\DavWWWRoot\\*",
        "* explorer*%CD%*", "*%cd%\\*.js*", "*attrib*%CD%*", "*/?cMD<*", "*/AutoIt3ExecuteScript*..*", "*&cls&cls&cls&cls&cls&*",
        "*&#*;&#*;&#*;&#*;*", "* &&s^eT*", "*& ChrW(*", "*&explorer /root*", "*start __ & __\\*", "*findstr /V /L *forfiles*",
        "*=wscri& set *", "*http*!COmpUternaME!*", "*start *.pdf * start /min cmd.exe /c *\\\\*", "*pip install*System.Net.WebClient*",
        "*Invoke-WebReques*Start-Process*", "*-command (Invoke-webrequest*", "*copy /b *\\\\* ping *-n*", "*echo*.ToCharArray*"
    ) or

    (process.args : "echo" and process.parent.name : ("wscript.exe", "mshta.exe")) or
    
    process.args : ("1>?:\\*.vbs", "1>?:\\*.js") or

    (process.args : "explorer.exe" and process.args : "type" and process.args : ">" and process.args : "start") or

    (
      process.parent.name : "explorer.exe" and
      process.command_line : (
        "*&&S^eT *",
        "*&& set *&& set *&& set *&& set *&& set *&& call*",
        "**\\u00??\\u00??\\u00??\\u00??\\u00??\\u00??\\u00??\\u00??*"
      )
    ) or

    (process.parent.name : "explorer.exe" and process.args : "copy" and process.args : "&&" and process.args : "\\\\*@*\\*")
  ) and

  /* false positives */
  not (process.args : "%TEMP%\\Spiceworks\\*" and process.parent.name : "wmiprvse.exe") and
  not ?process.parent.executable : (
        "?:\\Perl64\\bin\\perl.exe",
        "?:\\Program Files\\nodejs\\node.exe",
        "?:\\Program Files\\HP\\RS\\pgsql\\bin\\pg_dumpall.exe",
        "?:\\Program Files (x86)\\PRTG Network Monitor\\64 bit\\PRTG Server.exe",
        "?:\\Program Files (x86)\\Spiceworks\\bin\\spiceworks-finder.exe",
        "?:\\Program Files (x86)\\Zuercher Suite\\production\\leds\\leds.exe",
        "?:\\Program Files\\Tripwire\\Agent\\Plugins\\twexec\\twexec.exe",
        "D:\\Agents\\?\\_work\\_tasks\\*\\SonarScanner.MSBuild.exe",
        "?:\\Program Files\\Microsoft VS Code\\Code.exe",
        "?:\\programmiweb\\NetBeans-*\\netbeans\\bin\\netbeans64.exe",
        "?:\\Program Files (x86)\\Public Safety Suite Professional\\production\\leds\\leds.exe",
        "?:\\Program Files (x86)\\Tier2Tickets\\button_gui.exe",
        "?:\\Program Files\\NetBeans-*\\netbeans\\bin\\netbeans*.exe",
        "?:\\Program Files (x86)\\Public Safety Suite Professional\\production\\leds\\leds.exe",
        "?:\\Program Files (x86)\\Tier2Tickets\\button_gui.exe",
        "?:\\Program Files (x86)\\Helpdesk Button\\button_gui.exe",
        "?:\\VTSPortable\\VTS\\jre\\bin\\javaw.exe",
        "?:\\Program Files\\Bot Framework Composer\\Bot Framework Composer.exe",
        "?:\\Program Files\\KMSYS Worldwide\\eQuate\\*\\SessionMgr.exe",
        "?:\\Program Files (x86)\\Craneware\\Pricing Analyzer\\Craneware.Pricing.Shell.exe",
        "?:\\Program Files (x86)\\jumpcloud-agent-app\\jumpcloud-agent-app.exe",
        "?:\\Program Files\\PostgreSQL\\*\\bin\\pg_dumpall.exe",
        "?:\\Program Files (x86)\\Vim\\vim*\\vimrun.exe") and
  not (
        /* Crowdstrike doesn't populate process.parent.executable */
        data_stream.dataset == "crowdstrike.fdr" and
        process.parent.name : (
          "perl.exe", "node.exe", "pg_dumpall.exe", "PRTG Server.exe", "spiceworks-finder.exe", "leds.exe", "twexec.exe",
          "SonarScanner.MSBuild.exe", "Code.exe", "netbeans64.exe", "javaw.exe", "Bot Framework Composer.exe", "SessionMgr.exe",
          "Craneware.Pricing.Shell.exe", "jumpcloud-agent-app.exe", "vimrun.exe"
        )
      ) and
  not (process.args :  "?:\\Program Files\\Citrix\\Secure Access Client\\nsauto.exe" and process.parent.name : "userinit.exe") and
  not process.args : (
        "?:\\Program Files (x86)\\PCMatic\\PCPitstopScheduleService.exe",
        "?:\\Program Files (x86)\\AllesTechnologyAgent\\*",
        "https://auth.axis.com/oauth2/oauth-authorize*"
  ) and
  not process.command_line : (
    "\"cmd\" /c %NETBEANS_MAVEN_COMMAND_LINE%",
    "?:\\Windows\\system32\\cmd.exe /q /d /s /c \"npm.cmd ^\"install^\" ^\"--no-bin-links^\" ^\"--production^\"\""
  ) and
  not (process.name : "cmd.exe" and process.args : "%TEMP%\\Spiceworks\\*" and process.args : "http*/dataloader/persist_netstat_data") and
  not (process.args == "echo" and process.args == "GEQ" and process.args == "1073741824")

Field Validations

Loading…

Comments (0)

Loading comments...