Malicious Office (OLE) — malware analysis report

Heuristics 11

• VBA macros detected medium 8 related findings OLE_VBA_MACROS
  Document contains VBA macro code
• WScript.Shell usage critical OLE_VBA_WSCRIPT
  WScript.Shell usage
  Matched line in script

  On Error Resume Next
  Set wshs = CreateObject("wscript.shell")
  Set fso = CreateObject("scripting.filesystemobject")

• Obfuscated VBA Shell command with URL critical OLE_VBA_OBFUSCATED_SHELL_URL
  VBA macro invokes Shell with command text assembled through decoder or string-manipulation functions and includes a URL. This is a high-confidence downloader/dropper pattern, stronger than Shell or URL evidence on their own.
  Matched line in script

  On Error Resume Next
  Set wshs = CreateObject("wscript.shell")
  Set fso = CreateObject("scripting.filesystemobject")

• VBA WMI Win32_Process launcher critical OLE_VBA_WMI_PROCESS_CREATE
  VBA macro builds or references a WMI moniker for Win32_Process and invokes .Create to start a command. This is a high-confidence macro execution chain that often hides the WMI class name through string concatenation or helper functions.
  Matched line in script

  On Error Resume Next
  Set wshs = CreateObject("wscript.shell")
  Set fso = CreateObject("scripting.filesystemobject")

• Obfuscated auto-exec VBA loader critical OLE_VBA_OBFUSCATED_AUTOEXEC_LOADER
  Auto-exec VBA reconstructs strings with a heavy custom decoder (numeric char-array, repeated hex-string decode, or junk-token Replace removal) and feeds them to a COM-instantiation or execution sink. This obfuscated-loader shape keeps CreateObject/Shell/URL indicators out of the macro source.
  Matched line in script

  On Error Resume Next
  Set wshs = CreateObject("wscript.shell")
  Set fso = CreateObject("scripting.filesystemobject")

• CreateObject call high OLE_VBA_CREATEOBJ
  CreateObject call
  Matched line in script

  On Error Resume Next
  Set wshs = CreateObject("wscript.shell")
  Set fso = CreateObject("scripting.filesystemobject")

• GetObject call high OLE_VBA_GETOBJ
  GetObject call
  Matched line in script

  Set wmi = GetObject("winmgmts:")
  Set systemwmi = wmi.instancesOf("win32_process")

• VBA p-code auto-exec with execution tokens high OLE_VBA_PCODE_AUTOEXEC_EXEC
  Compiled VBA/cache stream contains an auto-execution token together with shell/download/object-execution tokens. This catches p-code-only or source-extraction-failure macro documents where visible source is unavailable.
• Workbook_Open macro low OLE_VBA_WBOPEN
  Workbook_Open macro
  Matched line in script

  Private Sub Workbook_Open()
  On Error Resume Next

• Reference to Windows Script Host high SC_STR_WSCRIPT
  Reference to Windows Script Host
• Embedded URL info EMBEDDED_URL
  One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
  URL http://www.speedsurf.to/sk0r1337/sk0r/sk0r_own3d.jpg Referenced by macro

  • http://encryboy.en.funpic.de/steamfake.htmlReferenced by macro
  • http://encryboy.en.funpic.de/Cstrike_Tweaks.zipReferenced by macro

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